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摘要
申请公布号
US1944695(A)
申请公布日期
1934.01.23
申请号
US19310565093
申请日期
1931.09.25
申请人
INTERNATIONAL BUSINESS MACHINES CORPORATION
发明人
PHILLIPS BURDETTE H.
分类号
G07C1/06
主分类号
G07C1/06
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