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发明名称
Hand reading glass and the like
摘要
申请公布号
US2208642(A)
申请公布日期
1940.07.23
申请号
US19380215422
申请日期
1938.06.23
申请人
TESTRITE INSTRUMENT COMPANY, INC.
发明人
NEUWIRTH HERMAN
分类号
G02B25/00
主分类号
G02B25/00
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代理人
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