Nippon Telegraph and Telephone Public Corporation

Katsuhiro Kato

Hideo Suzuki

Norio Yano

Ginya Ishiguro

Yojiro Kishimoto

An electromagnetic coordinate selection device comprising a plurality of electromagnetically operated cross point switches arranged in a matrix form and a plurality of magnetic cores disposed at points corresponding to said cross point switches for operation thereof, with any desired cross point switch closed only when the first and second coils wound about the magnetic cores are additively excited wherein the magnetic cores are each of the composite type to stabilize the operation of the cross point switches and the cross point switches are collectively sealed in a single container or in groups in a plurality of vessels provided in a number equal to or smaller than the number of the conductors arranged in the direction of the row or column of said matrix.

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Yokohama, Japan

Katsuhiro Kato