Abstract: A mouse has a ball, a rotation detecting section for detecting the rotation of the ball, and a casing for containing the ball and the rotation detecting section. A hole is formed at a position on the upper surface of the casing directly above the ball, and covered with a transparent acrylic plate. This structure allows the operator to make certain, during operation, that the ball is smoothly rotating. The ball is placed offset toward the leading end of the mouse.

Abstract: A card includes a magnetic track portion on which value information representing a prepaid amount and one of serial number data consecutively assigned in an issuance order are magnetically recorded, and a serial number printing portion in which a number representing the serial number data is marked with a laser beam. A card issuing apparatus includes a recording/reproducing unit and a laser marking unit. The recording/reproducing unit magnetically records value information representing a prepaid amount and one of serial number data consecutively assigned in an issuance order in a first area of the card, and reads out the serial number data magnetically recorded in the first area. The laser marking unit marks a number represented by the serial number data read out by the recording/reproducing unit in a second area of the card with a laser beam.

Abstract: A card includes a magnetic track portion, a first bar code area, and a second bar code area. Value information representing a prepaid amount and management information for card management are magnetically recorded in the magnetic track portion. The first bar code area is formed parallel to the magnetic track portion at a position not overlapping the magnetic track portion. The first bar code area is recorded with a first bar code representing the value information. The second bar code area is formed in a direction perpendicular to the first bar code area at a position not overlapping the first bar code area. The second bar code area is printed with a second bar code representing the management information. A method of checking this card is also disclosed.

Abstract: A trap housing for trapping insects, which particularly allows an insect trapping adhesive sheet to be replaced with ease and which can trap a great number of insects efficiently, is provided. The adhesive trap housing is constructed so that a tray and a cover body having rectangular openings are pivotably joined with each other via hinge pieces and engagement members so as to allow the housing to be freely opened and closed. Retaining pieces are arranged on the corners of the tray so that an insect trapping adhesive sheet can be removably fixed thereto. In addition, a window is provided in the tray, and a curved portion projecting inward towards the tray is formed in a substantially middle portion of the cover body. Bird protecting barriers are attached to the openings of the cover body.

Abstract: A non-crystalline ether-imide type high purity bismaleimide composition represented by formula (I): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4 each represent a hydrogen atom, a halogen atom, or an alkyl group having from 1 to 4 carbon atoms; R.sup.5 represents a hydrogen atom or a methyl group; and R.sup.6 represents a hydrogen atom, a methyl group or a phenyl group. The non-crystalline bismaleimide (I) has a purity of 95 wt % or higher, a melting point of not higher than 130.degree. C., and exhibits excellent solubility in a solvent.