JPH0521541Y2 - - Google Patents

Info

Publication number
JPH0521541Y2
JPH0521541Y2 JP13445788U JP13445788U JPH0521541Y2 JP H0521541 Y2 JPH0521541 Y2 JP H0521541Y2 JP 13445788 U JP13445788 U JP 13445788U JP 13445788 U JP13445788 U JP 13445788U JP H0521541 Y2 JPH0521541 Y2 JP H0521541Y2
Authority
JP
Japan
Prior art keywords
drum
mud
scraper
contact
drilling bits
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 - Lifetime
Application number
JP13445788U
Other languages
English (en)
Japanese (ja)
Other versions
JPH0258079U (en]
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 JP13445788U priority Critical patent/JPH0521541Y2/ja
Publication of JPH0258079U publication Critical patent/JPH0258079U/ja
Application granted granted Critical
Publication of JPH0521541Y2 publication Critical patent/JPH0521541Y2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
  • Earth Drilling (AREA)
JP13445788U 1988-10-17 1988-10-17 Expired - Lifetime JPH0521541Y2 (en])

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13445788U JPH0521541Y2 (en]) 1988-10-17 1988-10-17

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13445788U JPH0521541Y2 (en]) 1988-10-17 1988-10-17

Publications (2)

Publication Number Publication Date
JPH0258079U JPH0258079U (en]) 1990-04-26
JPH0521541Y2 true JPH0521541Y2 (en]) 1993-06-02

Family

ID=31393229

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13445788U Expired - Lifetime JPH0521541Y2 (en]) 1988-10-17 1988-10-17

Country Status (1)

Country Link
JP (1) JPH0521541Y2 (en])

Also Published As

Publication number Publication date
JPH0258079U (en]) 1990-04-26

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