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发明名称
Letter sheet
摘要
申请公布号
US2169436(A)
申请公布日期
1939.08.15
申请号
US19350032065
申请日期
1935.07.18
申请人
UNITED STATES ENVELOPE COMPANY
发明人
SWIFT WILLARD E.
分类号
B42D15/08
主分类号
B42D15/08
代理机构
代理人
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