Abstract: Sixty strip-like phosphor display elements are formed on an insulated substrate to extend radially from its center at equiangular intervals, and inner and outer grids are disposed substantially concentrically with the radially extending phosphor display elements in opposing relation thereto. A thermo-electron emissive heater is disposed in opposing relation to the inner and outer grids on the opposite side from the phosphor display elements. A drive-display circuit provides, on a time-shared basis, a short hand display by selecting one of the phosphor display elements corresponding to an hours signal and applying a voltage to the inner grid alone, and provides a long hand display by selecting one of the phosphor display elements corresponding to a minutes signal and applying voltages to both the inner and outer grids.

Abstract: A pen type electronic digital calculator in which keys are arranged in three rows on one half part of the tubular body in its lengthwise direction and when the three rows of keys are held substantially horizontal, the top surface of each key of the central row is higher than the top surfaces of the keys of the other rows. The keys of the respective rows are mounted so that they are longitudinally spaced from the keys of adjacent rows, and each key is disposed at the center of a recess formed in the tubular body.

Abstract: A writing instrument internally houses a miniature electronic calculator which includes a key input section comprising a single key which is subjected to a rotational or translational movement to select one of a plurality of switches. When the key is depressed against a bias applied thereto while in a position in which it has selected one of the switches, the selected switch is controlled thereby to input an associated information into an arithmetic unit of the calculator. The instrument case or key is marked with indicia which designate the key positions for the convenience of selecting input informations. The key input section comprises an insulating substrate on which an array of a plurality of stationary contacts are formed along the direction of movement of the key, a flexible insulating film disposed in opposing relationship with the stationary contacts, and a movable contact deposited on the side of film which faces the stationary contacts so as to extend in the direction of movement of the key.

Abstract: A jack is provided in which a movable contact is driven away from a fixed contact upon insertion of a plug and returns into abutting relationship with the fixed contact upon withdrawal of the plug. The movable contact comprises an electrically conductive, rigid body which is rotatably mounted at its one end, and is biased toward the fixed contact by means of a coiled spring. When the plug is inserted, the movable contact is displaced against the resilience of the coiled spring to move away from the fixed contact, while when the plug is withdrawn, the resilience of the coiled spring urges the movable contact into abutting relationship with the fixed contact.