JPH0118238B2 - - Google Patents

Info

Publication number
JPH0118238B2
JPH0118238B2 JP59217563A JP21756384A JPH0118238B2 JP H0118238 B2 JPH0118238 B2 JP H0118238B2 JP 59217563 A JP59217563 A JP 59217563A JP 21756384 A JP21756384 A JP 21756384A JP H0118238 B2 JPH0118238 B2 JP H0118238B2
Authority
JP
Japan
Prior art keywords
outer tube
bit
tube
inner tube
hole
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
JP59217563A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6195194A (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 JP21756384A priority Critical patent/JPS6195194A/ja
Publication of JPS6195194A publication Critical patent/JPS6195194A/ja
Publication of JPH0118238B2 publication Critical patent/JPH0118238B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Earth Drilling (AREA)
JP21756384A 1984-10-17 1984-10-17 拡孔ビツト Granted JPS6195194A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21756384A JPS6195194A (ja) 1984-10-17 1984-10-17 拡孔ビツト

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21756384A JPS6195194A (ja) 1984-10-17 1984-10-17 拡孔ビツト

Publications (2)

Publication Number Publication Date
JPS6195194A JPS6195194A (ja) 1986-05-13
JPH0118238B2 true JPH0118238B2 (enExample) 1989-04-04

Family

ID=16706216

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21756384A Granted JPS6195194A (ja) 1984-10-17 1984-10-17 拡孔ビツト

Country Status (1)

Country Link
JP (1) JPS6195194A (enExample)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4936840B2 (ja) * 2006-09-28 2012-05-23 株式会社東芝 電子機器及びスピーカ制御方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58124580U (ja) * 1982-02-15 1983-08-24 古河鉱業株式会社 二重管式ドリルロツド

Also Published As

Publication number Publication date
JPS6195194A (ja) 1986-05-13

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