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发明名称
Process of making piston rings
摘要
申请公布号
US1788697(A)
申请公布日期
1931.01.13
申请号
US19280279992
申请日期
1928.05.23
申请人
JOHN WILLIAMS;JUDSON WILLIAMS
发明人
WILLIAMS JOHN;WILLIAMS JUDSON
分类号
B23P15/08;F16J9/06
主分类号
B23P15/08
代理机构
代理人
主权项
地址
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