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经营范围
发明名称
Combined fire shutter automatic control and film movement stabilizing device
摘要
申请公布号
US2280825(A)
申请公布日期
1942.04.28
申请号
US19380241840
申请日期
1938.11.22
申请人
HOLMAN ARTHUR J
发明人
HOLMAN ARTHUR J.
分类号
G03B21/18
主分类号
G03B21/18
代理机构
代理人
主权项
地址
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