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发明名称
Indexing system for calculators
摘要
申请公布号
US3015441(A)
申请公布日期
1962.01.02
申请号
US19570682016
申请日期
1957.09.04
申请人
INTERNATIONAL BUSINESS MACHINES CORPORATION
发明人
RENT EDWARD F.;POWELL FLAVIUS M.
分类号
G06F9/355
主分类号
G06F9/355
代理机构
代理人
主权项
地址
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