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发明名称
PLURAL MATRIX KEYBOARD WITH ELECTRICAL INTERLOCK CIRCUIT
摘要
申请公布号
US3576569(A)
申请公布日期
1971.04.27
申请号
USD3576569
申请日期
1968.10.02
申请人
HEWLETT-PACKARD CO.
发明人
ROBERT E. WATSON
分类号
H03M11/22;(IPC1-7):H04Q3/00
主分类号
H03M11/22
代理机构
代理人
主权项
地址
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