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发明名称
Collapsing film holding spool for moving pictures
摘要
申请公布号
US1845526(A)
申请公布日期
1932.02.16
申请号
US19290393470
申请日期
1929.09.18
申请人
AKELEY CAMERA, INC.
发明人
JR. JOHN LIVINGSTON SPENCE,
分类号
G03B21/32
主分类号
G03B21/32
代理机构
代理人
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