JPS63161990U - - Google Patents

Info

Publication number
JPS63161990U
JPS63161990U JP1987050778U JP5077887U JPS63161990U JP S63161990 U JPS63161990 U JP S63161990U JP 1987050778 U JP1987050778 U JP 1987050778U JP 5077887 U JP5077887 U JP 5077887U JP S63161990 U JPS63161990 U JP S63161990U
Authority
JP
Japan
Prior art keywords
passage
water
bit
air
casing
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.)
Pending
Application number
JP1987050778U
Other languages
English (en)
Japanese (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 JP1987050778U priority Critical patent/JPS63161990U/ja
Publication of JPS63161990U publication Critical patent/JPS63161990U/ja
Pending legal-status Critical Current

Links

Landscapes

  • Earth Drilling (AREA)
JP1987050778U 1987-04-03 1987-04-03 Pending JPS63161990U (cs)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1987050778U JPS63161990U (cs) 1987-04-03 1987-04-03

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1987050778U JPS63161990U (cs) 1987-04-03 1987-04-03

Publications (1)

Publication Number Publication Date
JPS63161990U true JPS63161990U (cs) 1988-10-21

Family

ID=30874445

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1987050778U Pending JPS63161990U (cs) 1987-04-03 1987-04-03

Country Status (1)

Country Link
JP (1) JPS63161990U (cs)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02120493A (ja) * 1988-10-26 1990-05-08 Koken Shisui Kogyo Kk ダウンザホールドリル

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS477682A (cs) * 1970-09-24 1972-04-24
JPS6239994B2 (cs) * 1983-02-02 1987-08-26 Kikunoka Shuzo Kk

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS477682A (cs) * 1970-09-24 1972-04-24
JPS6239994B2 (cs) * 1983-02-02 1987-08-26 Kikunoka Shuzo Kk

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02120493A (ja) * 1988-10-26 1990-05-08 Koken Shisui Kogyo Kk ダウンザホールドリル

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