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发明名称
Steganographic typewriter
摘要
申请公布号
US2058776(A)
申请公布日期
1936.10.27
申请号
US19330682259
申请日期
1933.07.26
申请人
FERNAND D AUVRAIN
发明人
D'AUVRAIN FERNAND
分类号
B23D37/04;G09C3/00
主分类号
B23D37/04
代理机构
代理人
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