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发明名称
Safety check
摘要
申请公布号
US1833869(A)
申请公布日期
1931.11.24
申请号
US19270224110
申请日期
1927.10.05
申请人
COTTON ROBERT C;MERSHON FRED J
发明人
COTTON ROBERT C.;MERSHON FRED J.
分类号
B42D15/00
主分类号
B42D15/00
代理机构
代理人
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