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发明名称
Film position indicator for cameras
摘要
申请公布号
US2530510(A)
申请公布日期
1950.11.21
申请号
US19460685408
申请日期
1946.07.22
申请人
BELL & HOWELL COMPANY
发明人
CRUMRINE CHESTER W.
分类号
G03B1/66
主分类号
G03B1/66
代理机构
代理人
主权项
地址
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