Improvements in steel bars for use as mine roof supports,申请号GB19480027671-传众专利搜索

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发明名称	Improvements in steel bars for use as mine roof supports
摘要
申请公布号	GB661674(A)	申请公布日期	1951.11.28
申请号	GB19480027671	申请日期	1948.10.25
申请人	DOLLERY & PALMER (PNEUMATIC TOOLS) LIMITED	发明人
分类号	E21D17/086	主分类号	E21D17/086
代理机构		代理人
主权项
地址

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