Two position pitch-changing mechanism,申请号US19450622180-传众专利搜索

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发明名称	Two position pitch-changing mechanism
摘要
申请公布号	US2457731(A)	申请公布日期	1948.12.28
申请号	US19450622180	申请日期	1945.10.13
申请人	ROBY HORACE H	发明人	ROBY HORACE H.
分类号	B64C11/34	主分类号	B64C11/34
代理机构		代理人
主权项
地址

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