Abstract: A primary implant member anchored in the jaw receives a secondary member which is held in the primary member by direct engagement by the head of a screw which bottoms in the primary member and O-ring bridges the radial play between these members in a dental implant. As a result, the retention of the secondary member does not depend on the state of the O-ring and the force with which the O-ring is held. Axial mobility and inclination of the secondary member is also permitted by the O-ring bridge.

Abstract: Concentrated, stable suspension of herbicidally active 1,3,5-triazines in a solution of pyridate in organic solvents or mixtures thereof, in which at 0.degree. C. pyridate is at least 10% by weight soluble and the 1,3,5-triazines are at most 1% by weight soluble, together with emulsifiers, as well as its use and a method for controlling weeds.

Abstract: Virus genes, for example coat protein genes, which bring about a reduction in the signs of infection by the corresponding virus or bring about virus resistance can be combined with herbicide-resistance genes for the transformation of plants.A combination of this type facilitates the selection of the transgenic plants. In addition, in practical field cultivation, the vitality of the plants is increased by the virus tolerance, and an improved plant protection is possible owing to the herbicide-resistance gene.

Abstract: A process for producing sintered parts with high wear resistance and good dynamic strength properties from formed bodies, which have been pressed as green parts from a completely-alloyed air-hardened heat-treatment steel powder with a carbon content of at least 0.3% added in the form of graphite. The process includes sintering the parts under protective gas at a sintering temperature of at least 1000.degree. C. and subsequent cooling. The sintered parts are cooled immediately after sintering from the sintering temperature to a first holding temperature in the range of Ar.sub.3 to a maximum of 150.degree. C. above Ar.sub.3 and are held for a first holding period of 5 to 25 minutes at this temperature (austenitizing phase). Immediately after this, the sintered parts are cooled in accelerated fashion to a second holding temperature by convective gas cooling and are held at this temperature for a second holding period.

Abstract: A stack of individual sheets of film is enclosed by lightproof plastic packaging. An opaque sheet is disposed at the bottom of the stack, and the side of the opaque sheet confronting the packaging is provided with a bar code containing information about the film. The packaging is removed in a lighttight area of a processing unit for the film and the bar code is read. The opaque sheet prevents the radiation used to read the bar code from reaching the film. The information retrieved from the bar code is employed to control processing of the film.

Abstract: Expression of a multigene RNA having self-splicing activityAn RNA is expressed which can release two or more active genes by means of inserted ribozyme structures. The expression can be carried out in plants or other organisms.

Abstract: Novel herbicidal N-cyanopyridazinones of the general formula ##STR1## in which the radicals R.sub.1, R.sub.2 and R.sub.3 independently of one another denote hydrogen, halogen, amino, nitro, cyano, alkyl, aryl, aralkyl, alkoxy or aryloxy groups, a process for their preparation, a herbicidal composition comprising them, and a method of controlling weeds.

Abstract: In a process for producing a workpiece from sintered metal, especially from sintered iron, the latter is subjected, after sintering, to a steam treatment at temperatures below 500.degree. C., especially at 430.degree.-480.degree. C., at a steam partial pressure of from 20 to 80 mbar, especially from 30 to 50 mbar, to form an oxide layer on the surface, and to subsequent surface-hardening. Workpieces, especially internally geared wheels for starters, having a wear-resistant surface and, in the core, properties unchanged by the hardening are obtained.

Abstract: A device having cores of metal oxide ceramic (for example, Y-Ba-Cu-O) for limiting a short circuit current in power supply systems. The concept provides that a choke core, when operated at a rated current, is superconductive and its shielding currents keep the resulting inductance in the choke at a low level. In the event of an overload, the winding of the choke generates a correspondingly high magnetic field in the core which puts the core into the normally conducting state. This causes the shielding currents to disappear in connection with a rise in the resulting inductance, thus limiting the current. In order to realize a particularly high inductance in the normally conductive case, the superconductive choke core may be made hollow and may be filled at least in part with a ferromagnetic material.

Abstract: An apparatus for clamping workpieces which have to be machined by a machine tool. The apparatus comprises a rectangular frame including two longitudinal frame members and two transverse frame members. Clamping means are provided to fix the workpieces to be machined to said rectangular frame. The clamping means comprise at least one auxiliary frame which is removably inserted in said rectangular frame. Each of the auxiliary frames includes two clamping bars which can be adjustably connected to each other and the ends thereof being adapted to be connected to the longitudinal frame members of the rectangular frame such that they are adjustable in the longitudinal direction of the longitudinal frame. The clamping bars comprise a plurality of continuous threaded bores running essentially perpendicular to the clamping bars, said bores being enlarged to a predetermined nominal diameter and said bores being adapted to selectively receive a clamping screw.

Abstract: The driving apparatus for the rotation of the spindle or the work piece pallet of an electroerosive machining device comprises two electric motors which drive e.g. the spindle to a rotational movement by means of two gear boxes and a plurality of gear wheels. In order to avoid any backlash in the gear box and any clearance between the gear wheels and to compensate the elasticity of the gear transmission, the two electric motors are always operated to rotate in opposite directions and/or to yield different values of torque. Thus, the entire transmission assembly is always subjected to a certain bias force so that a precise positioning of the spindle is possible by means of simple and inexpensive driving elements.

Abstract: The spreading apart and keeping apart of the individual disks in friction disk sets or clutches and/or brakes makes it possible to avoid drag torques and the losses of energy caused thereby. Spreading elements, in the form of magnetic bodies (8), which are inserted in disk carriers (1, 10) radially with respect to magnetizable marginal zones of the disks (4, 13) lead to equal polarity in the marginal zones concerned. A reciprocal rejection force of the individual disks (3, 14) in axial direction thereby results. Since the magnetic bodies (8) are firmly introduced in the disk carriers (1, 10), interruptions in operation and difficulties in assembly, the same as special processing of the disks, are avoided. The spreading forces themselves remain equal independently of the position and the speed. When electromagnetic coils (8A) are used, the spreading force can be switched off, for example, when actuating the piston (19) and thus the piston force is kept small.

Abstract: The invention provides a screw nut comprising a central inner thread and a radially extending slit, the width thereof essentially corresponding to the diameter of the central inner thread. Thus, a threaded bolt or a threaded stud can be radially inserted into said screw nut body. In order to avoid that the screw nut is displaced away from the threaded bolt or stud during tightening of the screw nut, the central inner thread comprises a plurality of thread turns provided with axially extending recesses directed towards the end surface of the screw nut which is under load when the screw nut is tightened on the threaded bolt or stud.

Abstract: The invention provides an apparatus for fixing a workpiece to be machined by a machine tool to the worktable of the machine tool in an exactly determined positional relationship with reference to a reference point located on the worktable of the machine tool. The apparatus of the invention comprises a workpiece receiving means adapted to removably receive the workpiece to be machined, and first positioning means comprising a first group of positioning apertures provided in the workpiece receiving means, and a first group of positioning studs provided on the worktable of the machining tool, said first group of positioning apertures and said first group of positioning studs cooperating to determine the position of the workpiece receiving means in X- and Y-direction.

Abstract: A radiation chopper has a chopper disk 9 which is driven by an electromotor 8 and disposed between a front and a rear part of the housing 2, 3 placed on top of each other wherein the rear part 3 of the housing has a multi-armed yoke 5 and the front part 2 of the housing has a support for at least one cell and at least one aperture 17, 18 permitting the radiation to pass from the chopper chamber 10 to the cell and at least one support 38, 39 disposed at the rear part 3 of the housing for mounting the radiation source. At each of its two ends, the motor 8 for driving the chopper disk 9 has one bearing collar 13, 15 of which the one in the rear can be inserted into a borehole 14 provided in the multi-armed yoke 5 which in turn is connected to supports 4, 4', . . . that are configured as one piece with the rear part 3 of the housing and the front bearing collar 15 engages a borehole 16 which is provided at the bottom of the supports 4, 4', . . . in the rear part 3 of the housing.

Abstract: An x-ray film has a flexible sheet having a front face and a rear face, a layer of an x-ray stimulable phosphor on the front face, and a layer of mangetically attractable material, for example a steel foil, on the rear face. This film is used with a film handling apparatus, normally a reader, having structure forming a flap support surface of a size at least equal to that of the film and at least one permanent magnet is imbedded in the structure and extends over the surface. Thus the rear face of the film can be adhered magnetically to the surface. An array of stripping elements is distributed over the surface and each element is displaceable through the surface between a recessed position below the surface and an advanced position projecting past the surface. An actuator can displace the elements from their withdrawn to their advanced position and thereby lift from the surface a film clinging magnetically to the surface.

Abstract: The invention provides a manufacturing jig to precisely position a workpiece with reference to a workpiece receiving means. The jig comprises a workpiece supporting member to which the workpiece is fixed and a receiving member on which said workpiece supporting member is releasably mounted. The receiving member comprises two registering pins protruding from one surface thereof. The workpiece supporting member comprises two centering apertures adapted to engage the two registering pins upon mounting the workpiece supporting member on the receiving member. The two centering apertures are located distantly to each other. The first centering aperture has a fixed position with reference to the workpiece supporting member and the second centering aperture is displaceable with reference to the workpiece supporting member in a direction along a tie line between the centers of the first and second centering apertures, but movable in a direction running perpendicular to said tie line.

Abstract: An implant in which a primary member is secured to the bone and has a recess receiving a secondary member. A screw threaded into a threaded bore of the secondary member drives a compression ring against an O-ring to permit the same radially and axially against the primary member to secure the secondary part to the primary part, seal the two relative to one another and allow a releasable connection.

Abstract: The invention refers to a tool or workpiece storing magazine incorporating a tool- or workpiece-change apparatus adapted to remove a tool or a workpiece from the magazine and to transport the it into a machining apparatus, and to remove a tool or workpiece from the machining apparatus and to transport it back to the storing magazine, respectively. The system comprises a plurality of essentially disc-shaped tool or workpiece supporting members rotatably and coaxially arranged with reference to a first axis of rotation which receive and support a plurality of tools or workpieces along the periphery thereof. A transport arm is pivotally mounted on a second axis of rotation and longitudinally displaceable along said second axis located in a certain distance from said first axis of rotation. The transport arm is adjustable with reference to its length and includes a gripping member mounted on its free end. The transport arm further includes a turning knuckle, the axis thereof extending in an angle of 45.degree.

Abstract: The invention provides a coupling device with a first, driven member and a second member to be driven by the first member to a rotational movement. A driving plate is arranged between the two members and fixedly connected to the second member. In order to provide an angularly and centrically well defined position of the two members relative to each other, said first driven member is equipped with a centrically as well as an eccentrically arranged driving pin, the outer surfaces thereof having at least partially a conical shape. The conical parts of the surfaces engage with openings correspondingly arranged in the driving plate, which is elastically deformed upon connection of the second member to the first member.