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发明名称
Counterbalancing mechanism
摘要
申请公布号
US1928245(A)
申请公布日期
1933.09.26
申请号
US19300473854
申请日期
1930.08.08
申请人
BLOSS RICHARD R;PFEIL ROY C
发明人
BLOSS RICHARD R.;PFEIL ROY C.
分类号
E21B1/02
主分类号
E21B1/02
代理机构
代理人
主权项
地址
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