Abstract: A cartridge which contains an inked ribbon for use in a high speed printer such as a wire matrix printer and typically driven by a capstan of the printer. The ribbon is arranged in the form of a mobius loop and the cartridge is constructed in a minimal number of components including a cartridge cover and cartridge base together forming a compartment for most of the loop, and a slotted pinch roller. The cover includes an integral pinch roller support post and part of the means for controlling the twist in the mobius loop. The base includes an integral ribbon peeler associated with the pinch roller and the other part of the control means for the loop twist. The cover and base are provided with ribbon guide means to support the ribbon only along a section thereof between the egress and ingress of the loop to the compartment, leaving a relatively long, linear portion of the ribbon unsupported by the cartridge, thus enabling use of the cartridge either in a stationary position or piggybacked to the printing head.

Abstract: A photograph display stand having two frame assemblies which are hinged together along their adjacent side edges so that one frame assembly may be moved 360.degree. with respect to the other. Each frame assembly is composed of two identical transparent members arranged back to back and through each a photograph may be viewed.

Abstract: A disk pack top cover assembly wherein the top cover has a well provided with a hole in the center of the bottom wall. A handle is rotatably mounted in the well and carries a tool body assembly that extends through the hole. The tool body includes a collar molded as an integral part of the handle and a tool body stamping that forms a cap over the lower end of the collar.

Abstract: A pistol-shaped pipetter capable of operation on a full range of pipettes from 0 to 25 ml and which has a pair of vacuum chambers which are activated by trigger-type devices on the pistol grip of the unit. With a small volume pipette the selector valve is placed in one setting wherein only one of the vacuum chambers is directly connected to the pipette. With a larger volume pipette, the selector valve is positioned so as to place both vacuum chambers in communication with it. A rapid discharge of the fluid in the pipette is achieved by trigger actuation while a fine, controlled discharge is achieved by an air bleed valve control.

Abstract: A cassette storage rack having a tray-like base with dividers so as to orient the cassettes in their boxes uniformly in the rack. The cassette boxes are retained in the rack by means of a resilient foam block which engages one edge of each box and urges it against an opposite retaining wall.

Abstract: This invention relates in general to a disc pack cartridge and more particularly pertains to a handle for a single disc cartridge having an improved mechanism that enables unlatching of the removable bottom cover of the cartridge. The handle can be raised from a horizontal to a vertical position on the top cover either to carry the latched cartridge about conveniently or to unlatch the bottom cover. A special guide is incorporated into the handle to control the path of movement of the handle when it is moved between its horizontal and vertical positions.

Abstract: A bottom cover for a disk pack having a magnet assembly secured to the cover bottom wall by an inverted channel. The magnet assembly includes pole pieces made of parallel plates that register with slots in the channel and permanent magnets disposed between the plates and within the channel.

Abstract: A cassette-carrying case having a base and cover joined by a piano hinge which allows the base and cover to be opened a full 180.degree.. Easily operable latches are incorporated into the cover, which automatically lock the case closed when the cover is moved to the closed position. A handle is incorporated into the main body of the base and cover.

Abstract: A picture display device includes an array of picture frames hinged together, as by an endless belt, in which the inner ends of the frame sections are attached to the endless belt. The frames radiate outwardly from the belt and are arrangeable in a pair of side-by-side packs in which the frames in each pack lie flat against each other, and in which the inner frame sections of one pack abut the inner frame sections of the other pack. A support is provided to hold the packs in side-by-side relation in a manner which permits advancement of and guides the frames from one pack to the next. The frames and the support are arranged so that advancement of a frame from the end of one pack to the beginning of the next pack causes all of the other frames in the array to advance an incremental amount. Means also are provided for biasing each of the frames in each pack flat against each other as well as to bias one of the packs against the other of the packs.

Abstract: A Leighton tube assembly designed for the growth of tissue cultures and their preservation comprising a tube, a cover slip and a means to close said tube. The tube, made from two injection molded pieces welded together, has a chamber toward its closed end and a neck towards its open end. The chamber has a wall with a flat portion which is separated from the open end of the tube by a dam located in the neck. The cover slip is molded of a plastic material which is both transparent and inert with respect to most chemical solvents. The cover slip has a culture segment which lies on said flat portion of the chamber wall when the slip is in its growth position and a handle. The handle is of a length which allows the positioning of a cap over the open end of the tube.

Abstract: A picture display device includes a plurality of generally rectangular frames hinged together, edge-to-edge in an endless series. The frames can be folded into an arrangement defining a compact pack from which a pair of frames project in an inverted-V display position. The assembly of frames is detachably mountable to a support device and in a manner in which manual rotational movement of the upwardly projecting pair of frames from the display position back toward the pack automatically raises another pair of frames to the display position.