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
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/20—Automatic control
- H03G3/22—Automatic control in amplifiers having discharge tubes
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR851486X | 1947-07-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE422748A true BE422748A (xx) |
Family
ID=9323611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE422748D BE422748A (xx) | 1947-07-01 |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE422748A (xx) |
| DE (1) | DE851486C (xx) |
| FR (2) | FR949150A (xx) |
| LU (1) | LU29081A1 (xx) |
Families Citing this family (6)
| 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 |
-
0
- LU LU29081D patent/LU29081A1/xx unknown
- BE BE422748D patent/BE422748A/xx unknown
-
1947
- 1947-07-01 FR FR949150D patent/FR949150A/fr not_active Expired
- 1947-12-30 FR FR56970D patent/FR56970E/fr not_active Expired
-
1950
- 1950-10-03 DE DES20363A patent/DE851486C/de not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR949150A (fr) | 1949-08-22 |
| DE851486C (de) | 1952-10-06 |
| LU29081A1 (xx) | |
| FR56970E (fr) | 1952-10-10 |