JPS6257791B2 - - Google Patents

Info

Publication number
JPS6257791B2
JPS6257791B2 JP8825480A JP8825480A JPS6257791B2 JP S6257791 B2 JPS6257791 B2 JP S6257791B2 JP 8825480 A JP8825480 A JP 8825480A JP 8825480 A JP8825480 A JP 8825480A JP S6257791 B2 JPS6257791 B2 JP S6257791B2
Authority
JP
Japan
Prior art keywords
bit
rock
circular hole
drilling
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
JP8825480A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5712793A (en
Inventor
Takao Shibukawa
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 JP8825480A priority Critical patent/JPS5712793A/ja
Publication of JPS5712793A publication Critical patent/JPS5712793A/ja
Publication of JPS6257791B2 publication Critical patent/JPS6257791B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Earth Drilling (AREA)
JP8825480A 1980-06-27 1980-06-27 Drilling of grooved hole Granted JPS5712793A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8825480A JPS5712793A (en) 1980-06-27 1980-06-27 Drilling of grooved hole

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8825480A JPS5712793A (en) 1980-06-27 1980-06-27 Drilling of grooved hole

Publications (2)

Publication Number Publication Date
JPS5712793A JPS5712793A (en) 1982-01-22
JPS6257791B2 true JPS6257791B2 (no) 1987-12-02

Family

ID=13937724

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8825480A Granted JPS5712793A (en) 1980-06-27 1980-06-27 Drilling of grooved hole

Country Status (1)

Country Link
JP (1) JPS5712793A (no)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6180883U (no) * 1984-10-30 1986-05-29

Also Published As

Publication number Publication date
JPS5712793A (en) 1982-01-22

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