Abstract: In a telephone set which can be used by inserting a card, a slit-like card insertion port is formed at a portion behind a handset hung up on a hanger of a surface of a housing and a card reader is arranged behind the card insertion port. A projecting hanger assembly is formed on the housing. A hanger portion for receiving the handset is formed at an upper portion of the hanger assembly, and hollow projections are formed at a lower portion thereof. Slits of the card insertion port are formed in the distal end faces of the projections, and the card reader is partially housed in the projections.

Abstract: According to this invention there is provided a method of recovering thiourea dioxide characterized in that in the production of thiourea dioxide by the reaction of thiourea and hydrogen peroxide in an aqueous solvent, the waste liquor after separation of the crystals of thiourea dioxide after reaction is treated with an ion-exchange resin to remove side reaction products and impurities contained therein, and is then concentrated with a reverse-osmotic membrane to crystallize the thiourea dioxide dissolved therein.

Abstract: According to this invention there is provided a process for preparing thiourea dioxide characterized in that in the production of thiourea dioxide by the reaction of thiourea and hydrogen peroxide in an aqueous solvent, ammonium bicarbonate is added to the reaction solution at a proper time.

Abstract: According to this invention there is provided a process for preparing thiourea dioxide characterized in that in the production of thiourea dioxide by the reaction of thiourea and hydrogen peroxide in an aqueous solvent, the filtrate after separation of the crystals of thiourea dioxide after reaction is treated with an ion-exchange resin to remove side reaction products and impurities contained therein and then is used again as a reaction solvent.

Abstract: A card retrieval system in which each card is provided at its one peripheral edge with a magnetic strip which includes a unique notch structure for the purpose of retrieving individual cards. A plurality of selector bars are positioned in a manner to meet at right angles to a stack of the cards, while a magnet is positioned against the magnetic strips of the stacked cards. By the attracting force of the magnet, a specific card is slightly drawn out from the card stack in cooperation with the selector bars and the notch structure. Subsequent to this, locking members are operative to preclude the drawing out of the other cards and the plurality of the selector bars are withdrawn over the retrieved card transportation course. In this manner, the retrieval of a specific card is accomplished by the magnet.