Method of and apparatus for operating electric motors,申请号US19280282103-传众专利搜索

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发明名称	Method of and apparatus for operating electric motors
摘要
申请公布号	US1819008(A)	申请公布日期	1931.08.18
申请号	US19280282103	申请日期	1928.06.01
申请人	CENTRAL ELECTRIC TOOL COMPANY	发明人	WEYANDT CARL S.
分类号	E21B1/22;H02K33/12	主分类号	E21B1/22
代理机构		代理人
主权项
地址

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