JPH0477688U - - Google Patents

Info

Publication number
JPH0477688U
JPH0477688U JP12133990U JP12133990U JPH0477688U JP H0477688 U JPH0477688 U JP H0477688U JP 12133990 U JP12133990 U JP 12133990U JP 12133990 U JP12133990 U JP 12133990U JP H0477688 U JPH0477688 U JP H0477688U
Authority
JP
Japan
Prior art keywords
drilling bit
arc
hammer body
tip
bit
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.)
Granted
Application number
JP12133990U
Other languages
English (en)
Japanese (ja)
Other versions
JPH0721677Y2 (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 JP12133990U priority Critical patent/JPH0721677Y2/ja
Publication of JPH0477688U publication Critical patent/JPH0477688U/ja
Application granted granted Critical
Publication of JPH0721677Y2 publication Critical patent/JPH0721677Y2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Earth Drilling (AREA)
JP12133990U 1990-11-19 1990-11-19 2重管式掘削ビット Expired - Lifetime JPH0721677Y2 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12133990U JPH0721677Y2 (ja) 1990-11-19 1990-11-19 2重管式掘削ビット

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12133990U JPH0721677Y2 (ja) 1990-11-19 1990-11-19 2重管式掘削ビット

Publications (2)

Publication Number Publication Date
JPH0477688U true JPH0477688U (US06815460-20041109-C00097.png) 1992-07-07
JPH0721677Y2 JPH0721677Y2 (ja) 1995-05-17

Family

ID=31869198

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12133990U Expired - Lifetime JPH0721677Y2 (ja) 1990-11-19 1990-11-19 2重管式掘削ビット

Country Status (1)

Country Link
JP (1) JPH0721677Y2 (US06815460-20041109-C00097.png)

Also Published As

Publication number Publication date
JPH0721677Y2 (ja) 1995-05-17

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Legal Events

Date Code Title Description
R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

EXPY Cancellation because of completion of term