A new or improved method for the production of helical longitudinal grooves on the outer surface of cylindrical tubes, more particularly spinning bobbins for the artificial silk industry,申请号GB19310034974-传众专利搜索

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发明名称	A new or improved method for the production of helical longitudinal grooves on the outer surface of cylindrical tubes, more particularly spinning bobbins for the artificial silk industry
摘要
申请公布号	GB375701(A)	申请公布日期	1932.06.30
申请号	GB19310034974	申请日期	1931.12.17
申请人	BERLIN-KARLSRUHER INDUSTRIE-WERKE AKTIENGESELLSCHAFT	发明人
分类号	A44B1/22;B21C37/20	主分类号	A44B1/22
代理机构		代理人
主权项
地址

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