Abstract: A typical booster circuit of the present invention comprises a first capacitor having first and second electrodes, a second capacitor having first and second electrodes, a switching circuit for transferring boosted potential appearing on each first electrode of the first and second capacitors to a boosting potential output node, a precharge circuit for precharging each first electrode of the first and second capacitors, a logic circuit for setting a potential level of the second electrode of the first capacitor to a first potential level and setting a potential level of the second electrode of the second capacitor to a second potential level which is higher than the first potential level, respectively upon reception of a control signal having a first state, and for setting the potential level of the second electrode of the first capacitor to the second potential level, and setting the potential level of the second electrode of the second capacitor to the first potential level, respectively upon reception of a

Abstract: A join operation processing system and a method of operating the system is usable in a distributed database management system including multiple local database management systems, computers employing distributed databases stored in the local database management systems, and a communication network for connecting said local database management systems and the computers. The join operation processing system can perform a join operation on a relational database. Each of the computers instructs prior computer to performing the join operation, and the database management system, managing relations associated with the join operation to read definitions so as to define said relations, reads the read definitions to thereby determine a process to process the join operation, and issues a request to the prescribed database management system to perform join operation processing based on the determination.

Abstract: A circuit for preventing a dV/dt erroneous operation of a PNPN semiconductor switch is replaced by a capacitance on the surface of a semiconductor substrate, a high resistance gate electrode. In other words, such a circuit is formed on the surface of the substrate by a slight modification of the basic design without decreasing the chip area and without isolating component elements.

Abstract: A submersible which can automatically move along the cable laid under water, has a sensor, and the information collected or gathered by said sensor is forwarded to the control unit on land through said cable. The submersible is for instance connected acoustically to said cable. The cable has a plurality of transducers at every predetermined length for sending the control signal from the cable to the submersible and receiving the information from the submersible.

Abstract: An ink-jet printer which blows ink drops to the surface of the printing paper so that the contours formed by the ink drop dots are letters, numerical figures and signs. The printer includes pairs of deflection plates with the amount and timing of the deflection being controlled by synchronized digitally controlled voltages.

Abstract: A high speed printer in which the ions produced between the high voltage impressed electrodes are modulated by an aperture board and then passed through an ink mist so as to electrically charge the ink particles whereby to print the desired letters, figures, signs, etc., on a printing paper, characterized in that a heating element is provided in the aperture board for lowering the relative humidity in said aperture board.

Abstract: An apparatus for analyzing sound ray paths of a sonar system by a hybrid computer is disclosed, wherein the sound velocity gradient g is computed by a digital computer and the ray angle .theta. and the coordinates (x, z) of the ray path are computed by an analog computer, thus, accurate and high speed analysis of the ray paths can be performed. Further, in the analog computation, the inclination of the sea bottom is taken into consideration by the presence of a reflection computer.

Abstract: A numerical control comprising an input means for reading a program, a forward-interpolating-information producing circuit, a reverse-interpolating-information producing circuit, an interpolation circuit and a control circuit for controlling the above means is provided.

Abstract: A magnetic relay having a core, coil, an armature with a pair of dielectric cards, a plurality of pairs of contact points and a contact spring, has been found. One of said dielectric cards pushes or releases the contact spring according to the electric current flowing in said coil and said pairs of contact points are closed or opened. The structure of the present relay is so simple that mass production and improvement of accuracy of the relay can be easily accomplished.

Abstract: A high speed printing apparatus in which ions produced between electrodes receiving a high voltage are passed through an ink mist so that they are deposited with the ink particles to perform printing with such ion-loaded ink, characterized in that the ink mist produced in a mist tank is once stored in a reservoir tank and then fed to the printing section.

Abstract: A large scale key-telephone system or telephone exchange system having approximately eighty extension channels and a push-button dial system has been disclosed. A common unit in the system is a DTMF oscillator, which is installed in each telephone set, according to a prior art. The present system is completely compatible with thus prior key-telephone system or exchange system.

Abstract: A conductive shield board for protecting an aperture board from discharge is mounted between a positive electrode and said aperture board in an ink mist type high speed printer.The ink mist type printer operates on the principle that an ion stream modulated by an aperture board according to the pattern of the character to be printed, charges the ink mist, which is then attracted by an electric field, to the surface of the paper. However, a high potential on a positive electrode for generating said ion stream sometimes causes an undesirable discharge between the positive electrode and the aperture board.In order to avoid said undesirable discharge, a conductive shield board is inserted between the positive electrode and the aperture board.

Abstract: A small scale electronic telephone exchange system of stored program control type having a plurality of trunks and a central computer has been disclosed. The trunks function to process the real time operation and, therefore, the central computer does not need to operate on a real time basis. The central computer always scans the condition of the trunks and the subscriber's telephone terminals and, upon detecting the change of said condition, it analyzes said change and performs the necessary process for said change. The present exchange system provides many new services but the cost of the system is reasonable.

Abstract: A high speed multicolor printing apparatus having an ink ribbon with colored stripes or bands of different colors to allow printing of a certain line with a different color from the other lines. The apparatus is provided with means to control the selected color for printing.

Abstract: A line concentrator for a time division data switching exchange. Asynchronous and synchronous data signals generated at asynchronous and synchronous data terminals are subjected to known multi-point and synchronous sampling to become a train of bit-multiplexed first asynchronous and synchronous data channel signals. Responsive to a train of bit-interleaved read-in pulse groups timed relative to the respective synchronous data signals, an arithmetic unit stores the data channel signals in an octet memory according to the asynchronous and synchronous data terminals. Responsive to a train of read-out pulses appearing for the respective data terminals, the arithmetic unit reproduces groups of uninterleaved data channel signals for each data terminal and composes the reproduced data channel signals into a train of second asynchronous and synchronous data channel signals given by a common and uninterleaved bit format.

Abstract: A key telephone system for subscribers is disclosed which includes at least a plurality of key telephone stations, a subscriber common equipment which connects the key telephone stations to each other and further connects the key telephone stations and an private automatic branch exchange, wherein said subscriber common equipment comprises switching network circuits, a register connecting circuit, line circuits, intra-office circuits, line circuit links, intra-office circuit links and a common controller, whereby each of said key telephone stations is connected to the subscriber common equipment through a pair of speech lines and a few control lines, and further said key telephone station can handle data processing services through said control lines by using a data terminal equipment attached to the key telephone station and a data processing unit by way of said subscriber common equipment.

Abstract: Printing apparatus which blows ink drops to the surface of the printing paper so that contours formed by the ink drops are letters, numerical figures and other symbols. A time delay is employed in charging the ink drops to be deposited, depending upon whether ink drops are to be successively or non-successively deposited upon the medium upon which printing takes place. By delaying the charging, compensation for the differences in deflection angle due to the pneumatic resistance and Coulomb force repulsion between successive and nonsuccessive dot deposition is effected.

Abstract: A high-frequency automatic gain control circuit for a common emitter earthed amplifier wherein a hybrid negative feedback is applied to an input stage thereof from the emitter of an output stage transistor through a hybrid transformer connected to the base of an input stage transistor and a series negative feedback is applied to the output stage thereof, and according to the present invention a diode which is shunted by a capacitor is connected in series to an emitter resistor of the output stage transistor, and an automatic gain control signal is applied to said diode for regulating the gain of said amplifier by controlling negative feedback ratio of said negative feedback.

Abstract: A key telephone system for subscribers is disclosed which includes at least a plurality of key telephone stations, a subscriber common equipment which connects the key telephone stations to each other and further connects the key telephone stations and an private automatic branch exchange, wherein said subscriber common equipment comprises switching network circuits, a register connecting circuit, line circuits, intra-office circuits, line circuit links, intra-office circuit links and a common controller, whereby each of said key telephone stations is connected to the subscriber common equipment through a pair of speech lines and a few control lines, and further said key telephone station can handle data processing services through said control lines by using a data terminal equipment attached to the key telephone station and a data processing unit by way of said subscriber common equipment.