Cylindrical hairspring form,申请号US19430503398-传众专利搜索

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发明名称	Cylindrical hairspring form
摘要
申请公布号	US2457631(A)	申请公布日期	1948.12.28
申请号	US19430503398	申请日期	1943.09.22
申请人	HAMILTON WATCH COMPANY	发明人	JR. WILLIAM OGLE BENNETT,
分类号	G04D3/00	主分类号	G04D3/00
代理机构		代理人
主权项
地址

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