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发明名称
Spring friction device
摘要
申请公布号
US1950659(A)
申请公布日期
1934.03.13
申请号
US19310573862
申请日期
1931.11.09
申请人
DAVIDSON ARTHUR C
发明人
DAVIDSON ARTHUR C.
分类号
B61F5/12
主分类号
B61F5/12
代理机构
代理人
主权项
地址
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