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发明名称
Operation chart and indicator
摘要
申请公布号
US1853076(A)
申请公布日期
1932.04.12
申请号
US19310544151
申请日期
1931.06.13
申请人
NYGAARD CHARLES E
发明人
NYGAARD CHARLES E.
分类号
D06F33/00
主分类号
D06F33/00
代理机构
代理人
主权项
地址
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