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发明名称
Negative holder
摘要
申请公布号
US2026836(A)
申请公布日期
1936.01.07
申请号
US19330700480
申请日期
1933.12.01
申请人
JONES HARRY C
发明人
JONES HARRY C.
分类号
G03B27/02
主分类号
G03B27/02
代理机构
代理人
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