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发明名称
Button back
摘要
申请公布号
US2436323(A)
申请公布日期
1948.02.17
申请号
US19450620764
申请日期
1945.10.06
申请人
NYGARD ERIK A
发明人
NYGARD ERIK A.
分类号
A44B1/30
主分类号
A44B1/30
代理机构
代理人
主权项
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