Abstract: A data pattern generator in which the address generation of a program counter (11) is controlled in accordance with an operation code and an operand read out of an instruction memory (12'). An address/data pattern is generated in response to an address/data computing instruction read out of the instruction memory (12'). Random logic patterns for testing a logic circuit are prestored in a data buffer memory (18) and are read out therefrom using an address created by an address pointer (19). The address generation of the address pointer (19) is controlled by control instructions and data written in a control instruction memory (22) and a load data memory (21) which are accessed by an address provided from the program counter (11).

Abstract: A metal diaphragm valve comprises a valve cage, a metallic valve seat integral with the valve cage, a metal diaphragm having a peripheral edge portion supported in a liquid-tight manner by the valve cage and a central portion facing the valve to touch and leave the seat, a drive member for opening and closing the metal diaphragm, and a diaphragm pressing member interposed between the drive member and the metal diaphragm and adapted to press the diaphragm against the valve seat at a uniform sealing pressure.

Abstract: A variable-displacement rotary compressor comprises a rotor with a vane and a side plate disposed to abut a side face of the rotor. The side plate has a suction port formed therein to open to both a working chamber abutment face thereof abutting to the rotor side face and a low pressure chamber, and the rotor has a suction path formed therein to open to the working chamber and to an abutment surface of the rotor. The suction path of the rotor communicates with the suction port of the side plate through rotation of the rotor so that a fluid is sucked from the low pressure chamber into the working chamber under suction stroke through the suction path and the suction port.

Abstract: A magnetic head for tape recorders and the like is manufactured with cores made of alloys of elements such as Al and Fe which have relatively large potential differences. In order to avoid the galvanic effect which may be produced by segregation and impurities in the alloys, a part of the tape sliding surface is made of an element such as Zn which is lower in galvanic potential than elements forming the cores, and that part of the tape sliding surface is made electrically conductive to the cores.