Dust-removing device,申请号US19390307869-传众专利搜索

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发明名称	Dust-removing device
摘要
申请公布号	US2228743(A)	申请公布日期	1941.01.14
申请号	US19390307869	申请日期	1939.12.06
申请人	ROCK OF AGES CORPORATION	发明人	BELANGER LOUIS J.
分类号	E21B21/015	主分类号	E21B21/015
代理机构		代理人
主权项
地址

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