Устройство для регулирования скорости подачи долота на забой,申请号SU19450341839-传众专利搜索

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发明名称	Устройство для регулирования скорости подачи долота на забой
摘要
申请公布号	SU72156(A1)	申请公布日期	1947.11.30
申请号	SU19450341839	申请日期	1945.12.20
申请人	SKVORTSOV M.M.	发明人	SKVORTSOV M.M.
分类号	E21B19/08;E21B44/02	主分类号	E21B19/08
代理机构		代理人
主权项
地址

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