JPS6147271B2 - - Google Patents

Info

Publication number
JPS6147271B2
JPS6147271B2 JP12619982A JP12619982A JPS6147271B2 JP S6147271 B2 JPS6147271 B2 JP S6147271B2 JP 12619982 A JP12619982 A JP 12619982A JP 12619982 A JP12619982 A JP 12619982A JP S6147271 B2 JPS6147271 B2 JP S6147271B2
Authority
JP
Japan
Prior art keywords
base
branch
center line
face
closed end
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
JP12619982A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5918889A (ja
Inventor
Sho Takano
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.)
Sumitomo Metal Mining Co Ltd
Original Assignee
Sumitomo Metal Mining Co Ltd
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 Sumitomo Metal Mining Co Ltd filed Critical Sumitomo Metal Mining Co Ltd
Priority to JP12619982A priority Critical patent/JPS5918889A/ja
Publication of JPS5918889A publication Critical patent/JPS5918889A/ja
Publication of JPS6147271B2 publication Critical patent/JPS6147271B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Earth Drilling (AREA)
JP12619982A 1982-07-20 1982-07-20 地中穿孔ドリルビツト Granted JPS5918889A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12619982A JPS5918889A (ja) 1982-07-20 1982-07-20 地中穿孔ドリルビツト

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12619982A JPS5918889A (ja) 1982-07-20 1982-07-20 地中穿孔ドリルビツト

Publications (2)

Publication Number Publication Date
JPS5918889A JPS5918889A (ja) 1984-01-31
JPS6147271B2 true JPS6147271B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1986-10-18

Family

ID=14929153

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12619982A Granted JPS5918889A (ja) 1982-07-20 1982-07-20 地中穿孔ドリルビツト

Country Status (1)

Country Link
JP (1) JPS5918889A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Also Published As

Publication number Publication date
JPS5918889A (ja) 1984-01-31

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