Hollow metal ball and method of making same,申请号US19360115002-传众专利搜索

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发明名称	Hollow metal ball and method of making same
摘要
申请公布号	US2177928(A)	申请公布日期	1939.10.31
申请号	US19360115002	申请日期	1936.12.09
申请人	DANBURY-KNUDSEN, INCORPORATED	发明人	KNUDSEN KNUD
分类号	B21D51/08	主分类号	B21D51/08
代理机构		代理人
主权项
地址

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