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Cyril Endfield, Christopher J Rainey, John Southgate: Computer apparatus and remote keyboards therefor. Hughes & Cassidy, February 23, 1988: US04727478 (14 worldwide citation)

Computer apparatus comprising a central computer having a data input port, means connecting two or more remote chord keyboards to the input port, and means for identifying with each respective keyboard alpha-numeric and like character data and command instructions generated by operation thereof and ...


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Computer apparatus and remote keyboards therefor. August 30, 1984: WO/1984/003375

Computer apparatus comprising a central computer (13) having a data input port (12), means (5, 6, 7, 8, 9) connecting two or more remote chord keyboards (1, 2, 3, 4) to the input port, means (10) for identifying with each respective keyboard aplpha-numeric and like character data and command instruc ...