JPS6437593U - - Google Patents

Info

Publication number
JPS6437593U
JPS6437593U JP12882087U JP12882087U JPS6437593U JP S6437593 U JPS6437593 U JP S6437593U JP 12882087 U JP12882087 U JP 12882087U JP 12882087 U JP12882087 U JP 12882087U JP S6437593 U JPS6437593 U JP S6437593U
Authority
JP
Japan
Prior art keywords
bit
upper bit
spring
expanding
rotatable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP12882087U
Other languages
English (en)
Japanese (ja)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP12882087U priority Critical patent/JPS6437593U/ja
Publication of JPS6437593U publication Critical patent/JPS6437593U/ja
Pending legal-status Critical Current

Links

Landscapes

  • Earth Drilling (AREA)
JP12882087U 1987-08-22 1987-08-22 Pending JPS6437593U (US20080094685A1-20080424-C00004.png)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12882087U JPS6437593U (US20080094685A1-20080424-C00004.png) 1987-08-22 1987-08-22

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12882087U JPS6437593U (US20080094685A1-20080424-C00004.png) 1987-08-22 1987-08-22

Publications (1)

Publication Number Publication Date
JPS6437593U true JPS6437593U (US20080094685A1-20080424-C00004.png) 1989-03-07

Family

ID=31382523

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12882087U Pending JPS6437593U (US20080094685A1-20080424-C00004.png) 1987-08-22 1987-08-22

Country Status (1)

Country Link
JP (1) JPS6437593U (US20080094685A1-20080424-C00004.png)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0312990U (US20080094685A1-20080424-C00004.png) * 1989-06-16 1991-02-08

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0312990U (US20080094685A1-20080424-C00004.png) * 1989-06-16 1991-02-08

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