Abstract: A memory circuit includes a plurality of storage areas each designated by one of a plurality of addresses. The control circuit stores a plurality of values, all of which are different from each other, in the plurality of storage areas, generates a first random number, obtains a first address that is one of the plurality of addresses using the first random number, reads a first value stored in a first storage area designated by the first address, and reads a second value stored in a second storage area designated by a second address. The second address is an address having the largest value among a range of addresses from which the first address can be obtained. The control circuit writes the second value into the first storage area after reading the first value therefrom. The control circuit outputs the first value as one value of an output random number.

Abstract: A torsion spring has a coil portion and a leg portion extending from the coil portion. A pin is inserted into the coil portion of the torsion spring in a first position so that the torsion spring is supported by the pin for rotation about the pin. The pin is moved to bring the torsion spring to a second position. The leg portion of the torsion spring is caused to abut against a guide member so that the torsion spring is rotated by a predetermined angle about the pin during the movement from the first position to the second position.

Abstract: A lock plate which comprises a plate body having protrusions, a shaft combined with and extending parallel to the plane of the plate body, and a torsion spring having a coiled portion engaged with the shaft is incorporated in the cassette case body of a video cassette in order to allow a guard panel to be locked in a closed position. The guard panel is mounted on a surface of the cassette case body, along which surface the magnetic tape slides. An apparatus for incorporating a lock plate in a video cassette comprises a plate holding device which holds the lock plate in an inclined orientation so that the surface of the plate body, on which surface the protrusions are formed, faces down obliquely and so that the shaft extends horizontally above the plate body. A fitting device grasps the lock plate held by the plate holding device, moves it linearly while keeping it in the inclined orientation, and thereby fits it into the cassette case body.

Abstract: A lock plate which comprises a plate body having protrusions, a shaft combined with and extending parallel to the plane of the plate body, and a torsion spring having a coiled portion engaged with the shaft is incorporated in the cassette case body of a video cassette in order to allow a guard panel to be locked in a closed position. The guard panel is mounted on a surface of the cassette case body, along which surface the magnetic tape slides. An apparatus for incorporating a lock plate in a video cassette comprises a plate holding device which holds the lock plate in an inclined orientation so that the surface of the plate body, on which surface the protrusions are formed, faces down obliquely and so that the shaft extends horizontally above the plate body. A fitting device grasps the lock plate held by the plate holding device, moves it linearly while keeping it in the inclined orientation, and thereby fits it into the cassette case body.

Abstract: In a method of applying a precisely measured quantity of grease to a desired part, the grease is stored and leveled in an open grease storing container at all times, and a grease applying pin is dipped into the grease through its surface and pulled out of the grease and then moved so that the grease on the grease applying pin is applied to the desired part, whereby the grease is maintained high in quality and the quantity of grease applied does not fluctuate.