LIGHT WEIGHT TYPE TWOOSTAGE EXPANSION BIT THAT USE DOUBLE CYLINDER,申请号JP19770112225-传众专利搜索

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发明名称	LIGHT WEIGHT TYPE TWOOSTAGE EXPANSION BIT THAT USE DOUBLE CYLINDER
摘要
申请公布号	JPS5445901(A)	申请公布日期	1979.04.11
申请号	JP19770112225	申请日期	1977.09.20
申请人	NIPPON CONCRETE IND CO LTD	发明人	ABE NOBUYUKI;WATANABE OSAMU;NUNOKAWA KOUJI;TANAKA ICHIROU;TOYODA TADAHIRO;MANABE MASAO
分类号	E21B10/32	主分类号	E21B10/32
代理机构		代理人
主权项
地址

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