JPS6118636B2 - - Google Patents

Info

Publication number
JPS6118636B2
JPS6118636B2 JP4417480A JP4417480A JPS6118636B2 JP S6118636 B2 JPS6118636 B2 JP S6118636B2 JP 4417480 A JP4417480 A JP 4417480A JP 4417480 A JP4417480 A JP 4417480A JP S6118636 B2 JPS6118636 B2 JP S6118636B2
Authority
JP
Japan
Prior art keywords
hole
axial direction
bit
drilling
pair
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.)
Expired
Application number
JP4417480A
Other languages
English (en)
Japanese (ja)
Other versions
JPS56142991A (en
Inventor
Takao Shibukawa
Mitsutoshi Katsuki
Taiji Nishio
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Matsuda KK
Original Assignee
Matsuda KK
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 by Matsuda KK filed Critical Matsuda KK
Priority to JP4417480A priority Critical patent/JPS56142991A/ja
Publication of JPS56142991A publication Critical patent/JPS56142991A/ja
Publication of JPS6118636B2 publication Critical patent/JPS6118636B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Earth Drilling (AREA)
JP4417480A 1980-04-03 1980-04-03 Drilling bit Granted JPS56142991A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4417480A JPS56142991A (en) 1980-04-03 1980-04-03 Drilling bit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4417480A JPS56142991A (en) 1980-04-03 1980-04-03 Drilling bit

Publications (2)

Publication Number Publication Date
JPS56142991A JPS56142991A (en) 1981-11-07
JPS6118636B2 true JPS6118636B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1986-05-13

Family

ID=12684209

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4417480A Granted JPS56142991A (en) 1980-04-03 1980-04-03 Drilling bit

Country Status (1)

Country Link
JP (1) JPS56142991A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61116892U (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1984-12-28 1986-07-23
JPH0273494U (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1988-11-24 1990-06-05

Also Published As

Publication number Publication date
JPS56142991A (en) 1981-11-07

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