JPH02136189U - - Google Patents

Info

Publication number
JPH02136189U
JPH02136189U JP4536489U JP4536489U JPH02136189U JP H02136189 U JPH02136189 U JP H02136189U JP 4536489 U JP4536489 U JP 4536489U JP 4536489 U JP4536489 U JP 4536489U JP H02136189 U JPH02136189 U JP H02136189U
Authority
JP
Japan
Prior art keywords
circumferential surface
driver sub
excavation
mounting shaft
key
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
JP4536489U
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 JP4536489U priority Critical patent/JPH02136189U/ja
Publication of JPH02136189U publication Critical patent/JPH02136189U/ja
Pending legal-status Critical Current

Links

Landscapes

  • Earth Drilling (AREA)
JP4536489U 1989-04-18 1989-04-18 Pending JPH02136189U (enrdf_load_stackoverflow)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4536489U JPH02136189U (enrdf_load_stackoverflow) 1989-04-18 1989-04-18

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4536489U JPH02136189U (enrdf_load_stackoverflow) 1989-04-18 1989-04-18

Publications (1)

Publication Number Publication Date
JPH02136189U true JPH02136189U (enrdf_load_stackoverflow) 1990-11-13

Family

ID=31559474

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4536489U Pending JPH02136189U (enrdf_load_stackoverflow) 1989-04-18 1989-04-18

Country Status (1)

Country Link
JP (1) JPH02136189U (enrdf_load_stackoverflow)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5816437A (ja) * 1981-07-21 1983-01-31 Toshiba Corp 防爆型陰極線管の製造方法
JPS6323508U (enrdf_load_stackoverflow) * 1986-07-28 1988-02-16

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5816437A (ja) * 1981-07-21 1983-01-31 Toshiba Corp 防爆型陰極線管の製造方法
JPS6323508U (enrdf_load_stackoverflow) * 1986-07-28 1988-02-16

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