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发明名称
Latch for safety hooks
摘要
申请公布号
US2100779(A)
申请公布日期
1937.11.30
申请号
US19360078185
申请日期
1936.05.06
申请人
BYRON JACKSON CO.
发明人
HERTEL RICHARD K.
分类号
E21B19/04
主分类号
E21B19/04
代理机构
代理人
主权项
地址
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