JPS633113B2 - - Google Patents

Info

Publication number
JPS633113B2
JPS633113B2 JP58219202A JP21920283A JPS633113B2 JP S633113 B2 JPS633113 B2 JP S633113B2 JP 58219202 A JP58219202 A JP 58219202A JP 21920283 A JP21920283 A JP 21920283A JP S633113 B2 JPS633113 B2 JP S633113B2
Authority
JP
Japan
Prior art keywords
outer tube
tube
bit
tip
inner tube
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
JP58219202A
Other languages
English (en)
Japanese (ja)
Other versions
JPS60112984A (ja
Inventor
Masayasu Tamada
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to JP21920283A priority Critical patent/JPS60112984A/ja
Publication of JPS60112984A publication Critical patent/JPS60112984A/ja
Publication of JPS633113B2 publication Critical patent/JPS633113B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Earth Drilling (AREA)
JP21920283A 1983-11-21 1983-11-21 小口径拡孔ビット Granted JPS60112984A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21920283A JPS60112984A (ja) 1983-11-21 1983-11-21 小口径拡孔ビット

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21920283A JPS60112984A (ja) 1983-11-21 1983-11-21 小口径拡孔ビット

Publications (2)

Publication Number Publication Date
JPS60112984A JPS60112984A (ja) 1985-06-19
JPS633113B2 true JPS633113B2 (US08063081-20111122-C00044.png) 1988-01-21

Family

ID=16731803

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21920283A Granted JPS60112984A (ja) 1983-11-21 1983-11-21 小口径拡孔ビット

Country Status (1)

Country Link
JP (1) JPS60112984A (US08063081-20111122-C00044.png)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6126410B2 (ja) * 2013-02-19 2017-05-10 Ｆｓテクニカル株式会社 拡径用ドリルビット
JP6126408B2 (ja) * 2013-02-19 2017-05-10 Ｆｓテクニカル株式会社 拡径用ドリルビット
JP6126407B2 (ja) * 2013-02-19 2017-05-10 Ｆｓテクニカル株式会社 拡径用ドリルビット
JP6126409B2 (ja) * 2013-02-19 2017-05-10 Ｆｓテクニカル株式会社 拡径用ドリルビット
JP2017105199A (ja) * 2017-01-18 2017-06-15 Ｆｓテクニカル株式会社 拡径用ドリルビット

Also Published As

Publication number Publication date
JPS60112984A (ja) 1985-06-19

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