US3924696A - Method and device for dust collecting air-flushed rock drilling - Google Patents

Method and device for dust collecting air-flushed rock drilling Download PDF

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Publication number
US3924696A
US3924696A US286614A US28661472A US3924696A US 3924696 A US3924696 A US 3924696A US 286614 A US286614 A US 286614A US 28661472 A US28661472 A US 28661472A US 3924696 A US3924696 A US 3924696A
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US
United States
Prior art keywords
air
shell
drill stem
ejector
dust
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Expired - Lifetime
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US286614A
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English (en)
Inventor
Dick Axel Horlin
Ek Klas Goran Gunnarsson
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Atlas Copco AB
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Atlas Copco AB
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Publication date
Application filed by Atlas Copco AB filed Critical Atlas Copco AB
Publication of USB286614I5 publication Critical patent/USB286614I5/en
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Publication of US3924696A publication Critical patent/US3924696A/en
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Expired - Lifetime legal-status Critical Current

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    • 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
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/01—Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes
    • E21B21/015—Means engaging the bore entrance, e.g. hoods for collecting dust
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/0042—Devices for removing chips
    • B23Q11/0046—Devices for removing chips by sucking

Definitions

  • the shell is provided 5 References Cited with an outlet opening through which dust and air is UNITED STATES PATENTS drained from the shell by means of a suction device. 1,850,317 3/1932 Dikant 175/209 12 Claims, 5 Drawing Figures US. Patent Dec. 9, 1975 Sheet 1 of 4 3 ,924,696
  • FIG. 1 shows a horizontal elevation of a device according to the invention.
  • FIG. 2 is a longitudinal section along line 2-2 in FIG. 1.
  • FIG. 3 is a vertical section through another embodiment of the invention in which the air ejector is divided into two halves and pivotably mounted on two axles together with a drill stem support.
  • FIG. 4 is a vertical section through still another embodiment of the invention in which an additional air ejector is provided for facilitating the dust collecting and transportation, especially when drilling in formations containing water.
  • FIG. 5 is a vertical section through an ejector adapted for a device according to the invention.
  • the device shown in FIGS. 1 and 2 comprises a circular housing 1 which is open at its forward rock surface facing end and which is provided with an eccentrically located opening at its opposite end.
  • the opening 2 is adapted for letting the drill stem pass through the hous ing.
  • an air ejector 3 which comprises a neck ring 4 having a curved inner contour and a narrow annular air slot 5.
  • the opening 2 and the neck ring 4 are so dimensioned as to constitute an air passage 6 between them and the drill stem.
  • the annular air slot 5 is connected to a pressure air source via an inlet conduit 7 and is intended to establish a primary air flow through the neck ring 4.
  • the primary air flow is directed substantially radially inwardly but is linked forwardly along the curved neck ring contour by the so called Coanda-effect.
  • the housing 1 is provided with an outlet tube 8 which is substantially tangentially directed in the housing and a conical rubber skirt 9.
  • the method according to the invention is the follow-
  • the housing 1 is placed at the rock surface and the drill stem 10 is introduced through the neck ring 4 and the housing 1.
  • air 12 is flushed down through the drill stem 10 and the drill bit 11 for blowing up of drill dust from the bore hole.
  • the flush-air comes up to the surface with a considerable velocity containing the drill dust.
  • the housing 1 is placed so that its rubber skirt 9 will be at a distance of a few centimetres above the rock surface.
  • Pressure air is supplied to the air ejector 3 whereby there is obtained a primary air flow 13 through the air passage 6.
  • the primary air flow causes a secondary air flow 14, for example of atmospheric air, down through the passage 6.
  • the latter For transportation of the dust away from the housing, the latter is connected to a suction device (not shown).
  • This suction device is so dimensioned as to establish an atmospheric air flow 15 into the housing between the rubber skirt 9 and the rock surface whereby the dust is unable to escape into the atmosphere.
  • One object of the conical rubber skirt 9 is to catch the most diverging particles coming out through the bore hole. Especially when the device is located at a distance from the rock surface there are lots of such particles. Another object of the rubber skirt 9 is to elastically absorb or compensate for irregularities of the rock surface when the device is located close to the rock surface.
  • the dust collecting device is most efficient when there is a gap left between the skirt-9 and the rock surface because of the fact that the suctional draining of the housing is most efficient when the pressure inside the housing is not too low and when the transported air volume is large.
  • atmospheric air 15 is prevented from entering the housing whereby the pressure inside the housing and the transported air volume decreases.
  • the method according to the invention has a characteristic that the dust carrying flush-air 12 which leaves the bore hole is slowed down in the housing by means of a counter-directed air stream. This means that the problems with inefficient seals which have to be used in the previous devices are solved.
  • the invention has a further characteristic that an air space 6 has to be present between the drill stem 10 and the housing 1 for enabling accomplishing of a counterdirected air flow. It is also characterized in that the opening 2 in the housing has to be of such a diameter that the drill stem 10, including the drill bit 11, must be able to pass through it.
  • sealings are used which necessitate the housings to be dividable to be able to be put around a drill stem. Such an arrangement is avoided by the present invention.
  • the method according to the invention is advantageous also by the fact that the housing may be located at a distance from the rock surface without losing any collecting effect.
  • the housing can be mounted on the forward end of a feed bar. It may also be disposed directly against the rock surface if desirable.
  • the collecting device according to the invention is very well protected from damage because direct contact with the drill stem is avoided. As the drill stem is always wobbling during drilling, damage may very easily occur on the housing if it is located on the rock surface without support. That is a serious problem in conventional dust collecting devices which have to be located directly on the rock surface to work.
  • the above described type of ejector is advantageous in producing a uniform air flow throughout the periphery and by having its air slot situated at a distance from the hole whereby the edges of the slot are protected from damage during maneuvering of the drill stem.
  • FIG. 3 there is shown a modification of the device according to the invention which is combined with a separable drill stem support 20 and intended for being mounted on a feed bar.
  • the ejector used in this embodiment is adapted for use with a drill stem having a diameter which is relatively small in comparison with the drill bit being used. If the ejector would be of the same type as the above described, the annular clearance between the neck ring 2 and the drill stem 10 would be too large because of the fact that the drill bit would have to pass through the neck ring 2.
  • this type of ejector is divided into two parts 21 and 22 which are pivotable about two parallel axles 23 and 24. Thus, the two halves of the ejector are pivotable between a closed work position and an open rest position. The two halves 21 and 22 of the ejector are pivotable about the same axles as the drill stern support 20.
  • FIG. 3 shows the ejector and the drill stem support in their open positions for letting the drill bit through.
  • the right part of FIG. 3 shows the ejector and the drill stem support in their working positions.
  • FIG. 4 there is shown still another embodiment of the dust collector according to the invention.
  • This de vice is provided with two counter-directed air ejectors 30 and 31 each of which comprises an annular airinjecting slot 32 and 33 and a neck ring 34 and 35 of the Coanda-type.
  • This dust collector is intended for use when drilling in formations containing water.
  • the rear ejector 30 has the same purpose as the ejectors of the above described embodiments, namely to prevent dust from escaping backwards along the drill stem 10.
  • the additional ejector 31 is located at the forward end of the housing 1 and is provided for facilitating the collecting of the flush-air which comes out of the hole being drilled together with dust and water.
  • Another object of the backwardly directed ejector 31 is to increasethe pressure within the housing 1 and thereby increase the velocity of the air-dust-water mix through the outlet tube 8. A high velocity is necessary in order to prevent the wet dust from setting in the tube.
  • This dust collecting device is preferably intended to be mounted on a feed bar and is for that purpose provided with two mounting flanges 36 and 37.
  • FIG. 5 there is shown a modified type of an ejector adapted for a dust collector according to the invention.
  • This ejector intends to solve the very special problem concerning the types of ejectors having a narrow slot as air injecting means. The problem is that even very small particles which are brought with the pressure air or which may come from outside, very easily get jammed in the narrow slot, and cause failure to the operation of the ejector.
  • This type of ejector shown in FIG. 5, has an elastic part 40 defining the upper edge of the slot.
  • This part 40 comprises a sleeve made of, for instance, a resilient material such as plastic and is prestressed toward a position in which the slot is closed.
  • the magnitude of prestressing and the elasticity of the sleeve 40 is chosen so as to yield for a certain pressure applied on the sleeve inside.
  • the ejector slot is opened to its proper work size for a proper work pressure.
  • This ejector is advantageous also in that the slot can be cleaned by applying a pressure exceeding the work pressure, whereby the slot is widened. By applying such a pressure, particles that may have gotten jammed in the slot are blown out therefrom.
  • This ejector is self-closing as well as selfcleaning.
  • the ejector is shown in a closed position in the left part of FIG. 5 and in an opened, pressurized, position to the right in FIG. 5.
  • a shell adapted to be located adjacent the rock surface, said shell being open at its forward end and being provided with a drill stem opening at its rear end, the drill stern opening of the shell being dimensioned to form an annular space around a drill stem to be inserted therein,
  • an air ejector provided at the rear end of the shell and including an annular slot through which pressure air is injected in a substantially radial direction, and a neck ring provided with a curved contour for linking the injected air flow forwards, through the annular space, said neck ring having a minimum internal diameter which is smaller than the diameter of said annular slot, said air ejector producing a forwardly directed air flow toward the rock surface through said annular space to aerodynamically retard the flow rate of the dust-containing flush-air rushing out of the hole being drilled, and
  • an outlet opening in said shell which is adapted to be connected to a suction device for draining of the air and dust from the shell.
  • Device characterized in that an additional, backwardly directed air ejector is provided at the forward end of the shell for boosting of the flush-air flow as well as the pressure inside the shell.
  • Device characterized in that said outlet opening is tangentially directed in the shell in order to cause rotation of the dust containing air within the shell during draining thereof, and that the drill stem opening is eccentrically disposed in the shell for supporting said air rotation.
  • Device characterized in that said shell includes a skirt projecting forwardly and adapted to be located adjacent the rock surface.
  • said ejector comprises a sleeve of resilient material which surrounds the neck ring and is provided with an internal flange which is prestressed toward the rear end of said neck ring.
  • Device characterized in that said air ejector comprises means for receiving pressure air internally of said resilient material sleeve for causing said sleeve to yield upon supply of said pressure air to open said slot.
  • a shell adapted to be located adjacent the rock surdiameter which is smaller than the diameter of said face, said shell being open at its forward end and annular l t, and being Provided with a drill Stem Opening at its rear an outlet opening in the shell for connection to a sucfind, Said drill Stem Opening Of the being tion device for draining of the air and dust from the mensioned so as to allow passage of a drill bit She therethrough,
  • an air ejector provided at the rear end of the shell for producing a forwardly directed air flow through an annular space defined between said drill stem 11.
  • Device according to claim 10 characterized in that said air ejector is divided into two halves both of which are movable between a closed, work position opening and the drill stem, said air ejector includ- 10 and an open, rest position inwhich latter position the ing an annular slot through which pressure air is inand any dull Stem Jolms may P throughjected in asubstantially radial direction, and aneck p l f 'q to Flaim charactenzed ring provided with a curved cont f li ki th that said air e ector [8 associated with a drill stem supinjected air flow forwards, through the annular port.
  • said neck ring having a minimum internal 15

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Earth Drilling (AREA)
  • Electrolytic Production Of Metals (AREA)
US286614A 1971-09-08 1972-09-05 Method and device for dust collecting air-flushed rock drilling Expired - Lifetime US3924696A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE11355/71A SE355840B (ru) 1971-09-08 1971-09-08

Publications (2)

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USB286614I5 USB286614I5 (ru) 1975-01-28
US3924696A true US3924696A (en) 1975-12-09

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US (1) US3924696A (ru)
JP (1) JPS5332321B2 (ru)
AT (1) AT323686B (ru)
AU (1) AU464689B2 (ru)
BR (1) BR7206183D0 (ru)
CA (1) CA973165A (ru)
DE (1) DE2243635C3 (ru)
FI (1) FI55392C (ru)
FR (1) FR2152710B1 (ru)
GB (1) GB1375456A (ru)
IT (1) IT969416B (ru)
NO (1) NO135717C (ru)
PL (1) PL76066B1 (ru)
RO (1) RO62028A (ru)
SE (1) SE355840B (ru)
ZA (1) ZA726028B (ru)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4081041A (en) * 1977-02-22 1978-03-28 Stauffer Chemical Company Of Wyoming Dust-collecting head
US4889196A (en) * 1988-11-07 1989-12-26 Johnston Vaughn R Diverter apparatus
US5320188A (en) * 1990-09-05 1994-06-14 England J Richard Underground mining system
US5660240A (en) * 1995-06-07 1997-08-26 Harms; Gregory W. Water and dust collector for wet core drilling
US6145162A (en) * 1998-02-26 2000-11-14 Hilti Aktiengesellschaft Suction head for an apparatus for sucking fluid media
US6332308B1 (en) 1999-06-04 2001-12-25 Rodney Miller Air filtration device for use with roof drill
US20030042048A1 (en) * 2001-09-04 2003-03-06 Hughes William James Down hole drilling assembly with independent jet pump
US20050000052A1 (en) * 2003-07-03 2005-01-06 Byles Raymond G. Vacuum attachment for drilling tool
US20070114063A1 (en) * 2005-11-18 2007-05-24 Winston Smith Mud depression tool and process for drilling
US20070244118A1 (en) * 2004-05-21 2007-10-18 Takeda Pharmaceutical Company Cyclic Amide Derivative, and Its Production and Use
US20100032211A1 (en) * 2006-07-19 2010-02-11 Petrus Christiaan Gouws Drilling apparatus for use in mining
ITNA20100029A1 (it) * 2010-06-18 2011-12-19 Nicola Maione Sistema per contrastare la fuoriuscita di fluidi in pressione e non, dal perforo durante le perforazioni nel sottosuolo.
US8403059B2 (en) 2010-05-12 2013-03-26 Sunstone Technologies, Llc External jet pump for dual gradient drilling
US20130125994A1 (en) * 2011-11-23 2013-05-23 Rolls-Royce Plc Swarf extraction tool
CN103362465A (zh) * 2013-08-02 2013-10-23 焦作市长海机械科技有限公司 矿井压风自负压孔口除尘装置
US20130330144A1 (en) * 2011-03-04 2013-12-12 Kraussmaffei Technologies Gmbh Device for the extraction, parallel to the process, of processing products arising during the processing of a workpiece
CN104612607A (zh) * 2015-02-12 2015-05-13 任花鹏 一种煤矿钻孔除尘装置
US20150176345A1 (en) * 2013-12-20 2015-06-25 Sandvik Mining And Construction Oy Drilling tool support and method of collaring
US9316070B1 (en) 2012-12-20 2016-04-19 J.H. Fletcher & Co. Pump for use with mine drill and related methods
CN109113800A (zh) * 2018-10-17 2019-01-01 南京工业职业技术学院 一种凿岩冲击尾气涡轮发电系统
US20190255578A1 (en) * 2016-06-21 2019-08-22 I3-Edge Ltd. Method and System for Stripping Tubulars and the Like Comprising Frustoconical Air Blade
EP4299873A1 (en) * 2022-07-01 2024-01-03 Sandvik Mining and Construction Oy Inlet tube, rock drilling rig and method of sampling

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53131401U (ru) * 1977-03-25 1978-10-18
FR2667111A1 (fr) * 1990-09-26 1992-03-27 Spie Batignolles Procede et dispositif pour traiter des produits de forage.
JP2001340112A (ja) 2000-05-31 2001-12-11 Ykk Corp 係脱具付咬合スライドファスナー
GB0921856D0 (en) 2009-12-15 2010-01-27 Black & Decker Inc Dust extractor
JP5773305B2 (ja) * 2010-11-19 2015-09-02 有限会社マンダイクレーン 削孔装置

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1850317A (en) * 1929-05-07 1932-03-22 Dikant Stephen Drill dust arrester
US1985157A (en) * 1934-08-06 1934-12-18 Henry L Friedman Dust eliminator
US2041690A (en) * 1934-01-13 1936-05-26 Arthur A Johnson Corp Pneumaticl drill
US2144586A (en) * 1933-01-13 1939-01-17 Kadco Corp Method of rock drilling and dust removal therefor
US2183262A (en) * 1938-09-22 1939-12-12 Kadco Corp Dust deflector
US2201270A (en) * 1936-04-17 1940-05-21 Mcintyre John Taylor Apparatus for allaying dust from rock drills
US2590958A (en) * 1950-01-19 1952-04-01 Joy Mfg Co Dust collector
US2712921A (en) * 1951-01-23 1955-07-12 Shell Dev Drilling well head
US2730335A (en) * 1953-03-16 1956-01-10 Lamprecht Joseph Air core drill
US2730333A (en) * 1953-03-16 1956-01-10 Sun Oil Co Dust deflector

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2055768A (en) * 1935-11-29 1936-09-29 Kadeo Corp Dust deflector
DE1232089B (de) * 1965-08-18 1967-01-12 Leo Baer Vorrichtung zur Staubbeseitigung bei mit Aussenspiralgestaenge arbeitenden Bohrmaschinen

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1850317A (en) * 1929-05-07 1932-03-22 Dikant Stephen Drill dust arrester
US2144586A (en) * 1933-01-13 1939-01-17 Kadco Corp Method of rock drilling and dust removal therefor
US2041690A (en) * 1934-01-13 1936-05-26 Arthur A Johnson Corp Pneumaticl drill
US1985157A (en) * 1934-08-06 1934-12-18 Henry L Friedman Dust eliminator
US2201270A (en) * 1936-04-17 1940-05-21 Mcintyre John Taylor Apparatus for allaying dust from rock drills
US2183262A (en) * 1938-09-22 1939-12-12 Kadco Corp Dust deflector
US2590958A (en) * 1950-01-19 1952-04-01 Joy Mfg Co Dust collector
US2712921A (en) * 1951-01-23 1955-07-12 Shell Dev Drilling well head
US2730335A (en) * 1953-03-16 1956-01-10 Lamprecht Joseph Air core drill
US2730333A (en) * 1953-03-16 1956-01-10 Sun Oil Co Dust deflector

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4081041A (en) * 1977-02-22 1978-03-28 Stauffer Chemical Company Of Wyoming Dust-collecting head
US4889196A (en) * 1988-11-07 1989-12-26 Johnston Vaughn R Diverter apparatus
GB2224527A (en) * 1988-11-07 1990-05-09 Vaughn R Johnston Diverter apparatus for earth drilling rig.
GB2224527B (en) * 1988-11-07 1992-04-08 Vaughn R Johnston Diverter apparatus
US5320188A (en) * 1990-09-05 1994-06-14 England J Richard Underground mining system
US5660240A (en) * 1995-06-07 1997-08-26 Harms; Gregory W. Water and dust collector for wet core drilling
US6145162A (en) * 1998-02-26 2000-11-14 Hilti Aktiengesellschaft Suction head for an apparatus for sucking fluid media
US6332308B1 (en) 1999-06-04 2001-12-25 Rodney Miller Air filtration device for use with roof drill
US20030042048A1 (en) * 2001-09-04 2003-03-06 Hughes William James Down hole drilling assembly with independent jet pump
US6877571B2 (en) * 2001-09-04 2005-04-12 Sunstone Corporation Down hole drilling assembly with independent jet pump
AU2002300837B2 (en) * 2001-09-04 2006-11-02 Sunstone Corporation Down hole drilling assembly with independent jet pump
US20050000052A1 (en) * 2003-07-03 2005-01-06 Byles Raymond G. Vacuum attachment for drilling tool
US20070244118A1 (en) * 2004-05-21 2007-10-18 Takeda Pharmaceutical Company Cyclic Amide Derivative, and Its Production and Use
US20070114063A1 (en) * 2005-11-18 2007-05-24 Winston Smith Mud depression tool and process for drilling
US20100032211A1 (en) * 2006-07-19 2010-02-11 Petrus Christiaan Gouws Drilling apparatus for use in mining
US8336401B2 (en) * 2006-07-19 2012-12-25 Petrus Christiaan Gouws Dust catcher and sampler for use with a mining drilling apparatus
US8403059B2 (en) 2010-05-12 2013-03-26 Sunstone Technologies, Llc External jet pump for dual gradient drilling
ITNA20100029A1 (it) * 2010-06-18 2011-12-19 Nicola Maione Sistema per contrastare la fuoriuscita di fluidi in pressione e non, dal perforo durante le perforazioni nel sottosuolo.
US20130330144A1 (en) * 2011-03-04 2013-12-12 Kraussmaffei Technologies Gmbh Device for the extraction, parallel to the process, of processing products arising during the processing of a workpiece
US9527182B2 (en) * 2011-03-04 2016-12-27 Kraussmaffei Technologies Gmbh Device for the extraction, parallel to the process, of processing products arising during the processing of a workpiece
US20130125994A1 (en) * 2011-11-23 2013-05-23 Rolls-Royce Plc Swarf extraction tool
US9316070B1 (en) 2012-12-20 2016-04-19 J.H. Fletcher & Co. Pump for use with mine drill and related methods
CN103362465A (zh) * 2013-08-02 2013-10-23 焦作市长海机械科技有限公司 矿井压风自负压孔口除尘装置
US20150176345A1 (en) * 2013-12-20 2015-06-25 Sandvik Mining And Construction Oy Drilling tool support and method of collaring
US9896889B2 (en) * 2013-12-20 2018-02-20 Sandvik Mining And Construction Oy Drilling tool support and method of collaring
CN104612607A (zh) * 2015-02-12 2015-05-13 任花鹏 一种煤矿钻孔除尘装置
US20190255578A1 (en) * 2016-06-21 2019-08-22 I3-Edge Ltd. Method and System for Stripping Tubulars and the Like Comprising Frustoconical Air Blade
US10890032B2 (en) * 2016-06-21 2021-01-12 13-Edge, Ltd. Method and system for stripping tubulars and the like comprising frustoconical air blade
CN109113800A (zh) * 2018-10-17 2019-01-01 南京工业职业技术学院 一种凿岩冲击尾气涡轮发电系统
EP4299873A1 (en) * 2022-07-01 2024-01-03 Sandvik Mining and Construction Oy Inlet tube, rock drilling rig and method of sampling

Also Published As

Publication number Publication date
FR2152710A1 (ru) 1973-04-27
CA973165A (en) 1975-08-19
RO62028A (ru) 1977-06-15
NO135717B (ru) 1977-02-07
GB1375456A (ru) 1974-11-27
USB286614I5 (ru) 1975-01-28
NO135717C (ru) 1977-05-16
SE355840B (ru) 1973-05-07
AU4622272A (en) 1974-03-07
JPS5332321B2 (ru) 1978-09-07
DE2243635B2 (de) 1973-10-31
JPS4836003A (ru) 1973-05-28
FI55392B (fi) 1979-03-30
IT969416B (it) 1974-03-30
ZA726028B (en) 1973-05-30
AT323686B (de) 1975-07-25
DE2243635C3 (de) 1974-10-10
BR7206183D0 (pt) 1973-09-18
FR2152710B1 (ru) 1978-03-03
AU464689B2 (en) 1975-09-04
FI55392C (fi) 1979-07-10
PL76066B1 (ru) 1975-02-28
DE2243635A1 (de) 1973-04-12

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