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发明名称
Blackboard compass
摘要
申请公布号
US2074102(A)
申请公布日期
1937.03.16
申请号
US19350027556
申请日期
1935.06.20
申请人
CHRISTY ELMER W
发明人
CHRISTY ELMER W.
分类号
B43L9/02
主分类号
B43L9/02
代理机构
代理人
主权项
地址
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