CODING KEYBOARD AND ELECTRICAL SWITCH THEREFOR
申请公布号:CA917572(A)
申请号:CAD917572
申请公布日期:1972.12.26
发明人:ROBERT H. TWYFORD
分类号:H01H13/70;H01H29/00;H04L13/16;(IPC1-7):H01H29/00
主分类号:H01H13/70
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