Apparatus for testing hardness of inside surfaces,申请号US19540434266-传众专利搜索

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发明名称	Apparatus for testing hardness of inside surfaces
摘要
申请公布号	US2816438(A)	申请公布日期	1957.12.17
申请号	US19540434266	申请日期	1954.06.03
申请人	PRATHER JOHN B	发明人	PRATHER JOHN B.
分类号	G01N3/42	主分类号	G01N3/42
代理机构		代理人
主权项
地址

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