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发明名称
Method for making valve spring retainer locks
摘要
申请公布号
US1973227(A)
申请公布日期
1934.09.11
申请号
US19310524448
申请日期
1931.03.23
申请人
SCHOENROCK OTTO R
发明人
SCHOENROCK OTTO R.
分类号
B21K1/20
主分类号
B21K1/20
代理机构
代理人
主权项
地址
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