JPS627746Y2 - - Google Patents

Info

Publication number
JPS627746Y2
JPS627746Y2 JP1981023664U JP2366481U JPS627746Y2 JP S627746 Y2 JPS627746 Y2 JP S627746Y2 JP 1981023664 U JP1981023664 U JP 1981023664U JP 2366481 U JP2366481 U JP 2366481U JP S627746 Y2 JPS627746 Y2 JP S627746Y2
Authority
JP
Japan
Prior art keywords
bit
attached
position detection
detecting
expanded
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
JP1981023664U
Other languages
English (en)
Japanese (ja)
Other versions
JPS57137690U (no
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 JP1981023664U priority Critical patent/JPS627746Y2/ja
Publication of JPS57137690U publication Critical patent/JPS57137690U/ja
Application granted granted Critical
Publication of JPS627746Y2 publication Critical patent/JPS627746Y2/ja
Expired legal-status Critical Current

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Landscapes

  • Earth Drilling (AREA)
JP1981023664U 1981-02-21 1981-02-21 Expired JPS627746Y2 (no)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1981023664U JPS627746Y2 (no) 1981-02-21 1981-02-21

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1981023664U JPS627746Y2 (no) 1981-02-21 1981-02-21

Publications (2)

Publication Number Publication Date
JPS57137690U JPS57137690U (no) 1982-08-27
JPS627746Y2 true JPS627746Y2 (no) 1987-02-23

Family

ID=29821413

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1981023664U Expired JPS627746Y2 (no) 1981-02-21 1981-02-21

Country Status (1)

Country Link
JP (1) JPS627746Y2 (no)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6744135B2 (ja) * 2016-06-01 2020-08-19 Ｊｆｅスチール株式会社 拡大掘削装置および拡大掘削方法
JP7092300B2 (ja) * 2018-01-18 2022-06-28 油電機テック株式会社 地中伝搬信号送受信装置、地中作業用のヘッド部、地中作業機械及び地中作業システム並びに地中作業管理方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5033963U (no) * 1973-07-20 1975-04-11
JPS55155898A (en) * 1979-05-23 1980-12-04 Elf Aquitaine Method and device for detecting and measuring fluid ore in lode during excavation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5033963U (no) * 1973-07-20 1975-04-11
JPS55155898A (en) * 1979-05-23 1980-12-04 Elf Aquitaine Method and device for detecting and measuring fluid ore in lode during excavation

Also Published As

Publication number Publication date
JPS57137690U (no) 1982-08-27

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