Abstract: A lapping composition which contains abrasive grains which are commercially available and which consists of plate alumina-powder prepared by milling and class:trying a sintered body of plate alumina obtained by calcinating aluminum hydroxide, and other plate alumina powder classified and prepared separately from but similarly to the first-mentioned plate alumina powder having average grain size which is in a range of from 1.3 times to 2.3 times as large as the average grain size of the first-mentioned plate alumina powder. Further provided is a lapping method with such a lapping composition by which the removal rate is improved and a lapped surface excellent in quality can be obtained.

Abstract: A latch arm for engaging with a corner portion of an IC is pivotably supported on a corner portion of a base member of an IC carrier or IC socket. A spring element extends from a rear end of the latch arm, and is bent to accumulate resilient force when the latch arm is pivoted upwardly to remove engagement. Thus, the latch arm is pivoted in the engaging direction by the accumulated resilient force, in order to maintain engagement with the IC.

Abstract: An electric part holding device for holding an electric part or part carrier has a base having a polygonal electric part or carrier accommodation portion for receiving an electric part or carrier therein, and a plurality of semi-elliptic springs, one mounted on the base at each opposing corner portion of the accommodation portion or along opposite sides thereof, each spring being resiliently movable between an outwardly convexly curved shape and an inwardly convexly curved shape, each spring in the outwardly convexly curved shape lying across an upper surface of the base for leaving the accommodation portion open for insertion and removal of an electric part or carrier, and in the inwardly convexly curved shape extending across the accommodation portion for being engaged with a corner of an electric part or carrier positioned in the accommodation portion.

Abstract: A pivot shaft member 8 is disposed at a central portion of an IC platform 2, and a pivotal operation portion disposed at a head portion of the shaft member 8 is exposed on an upper surface side of the IC platform 2. The shaft member 8 and the IC platform 2 or a socket board 1 are connected with each other by cam means. The IC platform 2 is guided between a higher position and a lower position by a pivotal operation of the pivot shaft member 8 in order to adjust an IC supporting height.

Abstract: An IC carrier includes an IC accommodating section formed in a central portion of a generally rectangular thin substrate, a lock for holding an IC package body in the IC accommodating section, and a lead wire supporting seat disposed on a substrate portion extending at the periphery of the IC accommodating section and adapted to support lead wire groups projecting sideward from the IC package body. The lead wire supporting seat is defined by a slotless flat surface for accommodating a group of the lead wires over its entire width. The lead wire groups are supported as a package on the lead wire supporting surfaces.

Abstract: A contact has a leg portion at one end and a resilient contact element at the other end. The resilient contact element is provided with a mother contact nose, on which an external terminal of an electronic part is to be placed, formed on its free end. A child contact nose is loosely engaged with an outer surface of the mother contact nose so that the child contact nose can be idly moved, and the child contact nose has a contacting surface larger than that of the mother contact nose.

Abstract: An IC socket apparatus for receiving and positioning an IC package which has a plurality of IC leads projecting laterally therefrom and carried in an IC carrier. An IC socket has an IC package receiving recess therein and a plurality of peripherally shiftable contacts around the periphery of the recess for engaging and contacting leads of an IC package inserted into the recess. Guide elements guide an IC carrier onto the IC socket with an IC package guided into the recess. A guide member in the recess has a plurality of IC package guide portions extending upright from the front surface and spaced for engaging peripheral edge portions of an IC package and has a plurality of contact engaging grooves around the periphery at positions corresponding to positions of leads on an IC package relative to the guide portions and the contacts are engaged in the grooves. The guide member is movably positioned in the recess for movement laterally and rotationally in the recess.

Abstract: A 7-bromo-.beta.-carboline compound of the formula (I): ##STR1## wherein R.sup.1 =H or C.sub.1 -C.sub.5 alkyl and R.sup.2 =C.sub.1 -C.sub.5 alkyl or benzyl, is produced by reacting a .beta.-carboline compound of the formula (II): ##STR2## wherein R.sup.1 and R.sup.2 are as defined above and R.sup.3 =H, C.sub.1 -C.sub.5 alkyl, C.sub.1 -C.sub.5 alkoxy or benzyloxy, with a brominating agent in an organic solvent in the presence of an alkalic and then hydrolyzing the resultant procursory 7-bromo-.beta.-carboline compound of the formula (III): ##STR3## is a solvent in the presence of a mineral acid.

Abstract: An IC carrier comprising a generally rectangular carrier body including a generally rectangular IC accommodating section at a generally central portion thereof, torsion bars each disposed at each corner portion of the carrier body, each torsion bar being disposed on a line opposite each corner portion of the IC accommodating section and diagonally crossing two sides forming the corner portion of the carrier body, resiliently displacable latch arms each rising from each of the torsion bars, and engaging claws each formed on a free end of each of the latch arms and adapted to engage with an upper edge portion of each of the corner portions of an IC package of a generally rectangular shape accommodated in the IC accommodating section.

Abstract: A 5-bromo-1-pentanal compound of the formula (I): ##STR1## wherein R.sup.1 and R.sup.2 respectively represent, independently from each other, a member selected from the group consisting of a hydrogen atom and alkyl radicals having 1 to 7 carbon atoms, or an acetal derivative of said 5-bromo-1-pentanal compound, is produced by subjecting a starting compound selected from the group consisting of 4-pentenal compounds of the formula (II): ##STR2## wherein R.sup.1 and R.sup.2 are as defined above, and acetal derivatives of the above-mentioned compounds, to a free radical addition reaction with hydrogen bromide in a liquid medium at a temperature of 10.degree. C. to 60.degree. C.; in the presence of a free radical initiator or by irradiating ultraviolet rays to the reaction mixture, and by collecting the resultant reaction product from the reaction mixture.

Abstract: In digging and hauling soil, rocks, minerals and the like by the use of a dragline the invention provides a novel combination of said dragline, a conveyor means for hauling the materials dug, and a hopper means disposed over and movable along said conveyor means whereby material may be efficiently excavated and transported out of the working area.

Abstract: In an internal combustion engine driven generator in which a capacitor excitation type synchronous generator is driven by an internal combustion engine, the internal combustion engine has a characteristic that the revolution per minute thereof is increased with a decreasing load applied thereto, and the generator has a characteristic that the output voltage thereof is decreased with a decreasing load current with the revolution per minute maintained unchanged.

Abstract: In digging and hauling soil, rocks, minerals and the like by the use of a dragline the invention provides a novel combination of said dragline, a conveyor for hauling the materials dug, and a hopper disposed over and movable along the conveyor whereby material may be efficiently excavated and transported out of the working area.

Abstract: A novel dragline is provided which is equipped with hopper means and loading means. More specifically, the dragline of the invention comprises a hopper means mounted on the front portion of a revolving frame rotatably mounted on a mobile base, the hopper means receiving rocks and stones, soil and sand, minerals and the like dug and carried by a bucket, a guide means for guiding the bucket to a position over the hopper means so that the excavated material is loaded into the hopper means, and a loading means disposed below the hopper means for receiving and transferring the material into another transport means, at least the downstream end portion of the loading means being pivotable. The dragline of the invention makes it possible to dig rocks and stones, soil and sand, minerals, etc. in an efficient manner on a large scale and to load them into a transport means.

Abstract: This invention relates to a synchronous generator comprising a stator having output winding means connected to a load or loads and main voltage building up means including capacitor means and capacitor exciting winding means, said capacitor means being connected across said capacitor exciting winding means, said output winding means and said capacitor exciting winding means being provided on a common core; and a rotor having field winding means across which a rectifier means is connected; wherein said synchronous generator further comprises auxiliary voltage building up means provided in said stator, said auxiliary voltage building up means causing the output winding means to provide said stator with armature reaction when initial large current has flowed through said auxiliary voltage building up means from said output winding means to thereby build up output voltage across said output winding means with the start of said generator.