Locking device for spring supported swivel hooks,申请号GB19300023015-传众专利搜索

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发明名称	Locking device for spring supported swivel hooks
摘要
申请公布号	GB353263(A)	申请公布日期	1931.07.23
申请号	GB19300023015	申请日期	1930.07.30
申请人	THE NATIONAL SUPPLY COMPANY	发明人
分类号	E21B19/04	主分类号	E21B19/04
代理机构		代理人
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地址

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