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发明名称
Collapsible rotary spear
摘要
申请公布号
US1776989(A)
申请公布日期
1930.09.30
申请号
US19280284946
申请日期
1928.06.13
申请人
BAIMBRIDGE ALPHAEUS C;ERWIN BURNS;ALEXANDER JESSE M
发明人
BAIMBRIDGE ALPHAEUS C.;BURNS ERWIN;ALEXANDER JESSE M.
分类号
E21B31/20
主分类号
E21B31/20
代理机构
代理人
主权项
地址
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