BE422748A - - Google Patents

Info

Publication number
BE422748A
BE422748A BE422748DA BE422748A BE 422748 A BE422748 A BE 422748A BE 422748D A BE422748D A BE 422748DA BE 422748 A BE422748 A BE 422748A
Authority
BE
Belgium
Application number
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.)
Publication of BE422748A publication Critical patent/BE422748A/xx

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/16—Plural down-hole drives, e.g. for combined percussion and rotary drilling; Drives for multi-bit drilling units
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/08—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods
    • E21B19/081—Screw-and-nut feed mechanisms
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/001—Drilling a non circular hole
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C25/00—Cutting machines, i.e. for making slits approximately parallel or perpendicular to the seam
    • E21C25/52—Machines incorporating two or more of the slitting means according to groups E21C25/02, E21C25/06, E21C25/16, E21C25/20 and E21C25/22
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/22—Automatic control in amplifiers having discharge tubes

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Milling, Broaching, Filing, Reaming, And Others (AREA)
BE422748D 1947-07-01 BE422748A (zh)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR851486X 1947-07-01

Publications (1)

Publication Number Publication Date
BE422748A true BE422748A (zh)

Family

ID=9323611

Family Applications (1)

Application Number Title Priority Date Filing Date
BE422748D BE422748A (zh) 1947-07-01

Country Status (4)

Country Link
BE (1) BE422748A (zh)
DE (1) DE851486C (zh)
FR (2) FR949150A (zh)
LU (1) LU29081A1 (zh)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1075070B (de) * 1960-02-11 Gebr. Eickhoff Maschinenfabrik u. Eisengießerei m.b.H., Bochum Gewinnungsmaschine mit mehreren getrieblich miteinander verbundenen, achsparallelen Schrämwalzen
GB1552636A (en) * 1975-05-29 1979-09-19 Wibom G H O Drilling machine
US5570934A (en) * 1995-03-16 1996-11-05 Hydro-Quebec Traction boring device using multiple trepans for producing large cuts in concrete works and the like and method of producing cuts
CN102691500A (zh) * 2011-03-19 2012-09-26 刘素华 锯冲式采煤机
DE102011087096B4 (de) * 2011-11-25 2014-12-11 Pierre-Yves Mutel Werkzeug und Verfahren zum Erstellen von Bohrlöchern mit einem nicht rotationssymmetrischen Querschnitt
CN110242293A (zh) * 2019-06-21 2019-09-17 辽宁工程技术大学 一种旋挖式截煤装置

Also Published As

Publication number Publication date
FR949150A (fr) 1949-08-22
DE851486C (de) 1952-10-06
LU29081A1 (zh)
FR56970E (fr) 1952-10-10

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