LU29081A1 - - Google Patents

Info

Publication number: LU29081A1
Authority: LU; Luxembourg

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.)

1947-07-01

Publication of LU29081A1 publication Critical patent/LU29081A1/xx

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)

LU29081D 1947-07-01 LU29081A1 (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number	Publication Date
LU29081A1 true LU29081A1 (en)

Family

ID=9323611

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
LU29081D LU29081A1 (en)	1947-07-01

Country Status (4)

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

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE1075070B (en) *		1960-02-11	Gebr. Eickhoff Maschinenfabrik u. Eisengießerei m.b.H., Bochum	Extraction machine with several gear-driven, axially parallel cutting rollers
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 (en) *	2011-03-19	2012-09-26	刘素华	Sawing-impacting coal cutter
DE102011087096B4 (en) *	2011-11-25	2014-12-11	Pierre-Yves Mutel	Tool and method for creating boreholes with a non-rotationally symmetrical cross section
CN110242293A (en) *	2019-06-21	2019-09-17	辽宁工程技术大学	A kind of rotary digging formula Coal cutter

0
- BE BE422748D patent/BE422748A/xx unknown
- LU LU29081D patent/LU29081A1/xx unknown
1947
- 1947-07-01 FR FR949150D patent/FR949150A/en not_active Expired
- 1947-12-30 FR FR56970D patent/FR56970E/en not_active Expired
1950
- 1950-10-03 DE DES20363A patent/DE851486C/en not_active Expired

Also Published As

Publication number	Publication date
FR56970E (en)	1952-10-10
DE851486C (en)	1952-10-06
BE422748A (en)
FR949150A (en)	1949-08-22

Publication	Publication Date	Title
FR961021A (en)	1950-04-28
AT166672B (en)	1950-09-11
AT165884B (en)	1950-05-10
BE474505A (en)	1947-04-30
FR963456A (en)	1950-07-11
BE485166A (en)
BE473812A (en)
NL77945C (en)
BE474118A (en)
BE401708A (en)
BE342691A (en)
BE470620A (en)
BE470671A (en)
NL74039C (en)
BE458425A (en)
NL69919C (en)
NL66561C (en)	1950-10-16
LU29322A1 (en)
LU29081A1 (en)
BE463900A (en)
BE467279A (en)
BE494345A (en)	1950-08-01
BE479650A (en)
BE485855A (en)
BE474240A (en)