ROCK DRILLING APPARATUS,申请号USD3528514-传众专利搜索

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发明名称	ROCK DRILLING APPARATUS
摘要
申请公布号	US3528514(A)	申请公布日期	1970.09.15
申请号	USD3528514	申请日期	1968.10.23
申请人	WESTINGHOUSE AIR BRAKE CO.	发明人	ROBERT L. SANDVIG
分类号	E21B21/16;(IPC1-7):E21B7/00	主分类号	E21B21/16
代理机构		代理人
主权项
地址

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