EP0276848B1 - Concasseur rotatif à aubes de projection autoprotégées - Google Patents

Concasseur rotatif à aubes de projection autoprotégées Download PDF

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Publication number
EP0276848B1
EP0276848B1 EP88101235A EP88101235A EP0276848B1 EP 0276848 B1 EP0276848 B1 EP 0276848B1 EP 88101235 A EP88101235 A EP 88101235A EP 88101235 A EP88101235 A EP 88101235A EP 0276848 B1 EP0276848 B1 EP 0276848B1
Authority
EP
European Patent Office
Prior art keywords
rotor
projection
vanes
length
rocks
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 - Lifetime
Application number
EP88101235A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0276848A3 (en
EP0276848A2 (fr
Inventor
Jean-Luc Delaye
Claude Dumont
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEYRTEC SA
Original Assignee
NEYRTEC SA
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 by NEYRTEC SA filed Critical NEYRTEC SA
Priority to AT88101235T priority Critical patent/ATE67433T1/de
Publication of EP0276848A2 publication Critical patent/EP0276848A2/fr
Publication of EP0276848A3 publication Critical patent/EP0276848A3/fr
Application granted granted Critical
Publication of EP0276848B1 publication Critical patent/EP0276848B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
    • B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
    • B02C13/1807—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate
    • B02C13/1835—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate by means of beater or impeller elements fixed in between an upper and lower rotor disc
    • B02C13/1842—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate by means of beater or impeller elements fixed in between an upper and lower rotor disc with dead bed protected beater or impeller elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
    • B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
    • B02C13/1807—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate
    • B02C2013/1885—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate of dead bed type

Definitions

  • the present invention relates to the crushing of stones, with a view to obtaining fragments thereof.
  • the essential problem posed for the production of crushers has long been that of their resistance to wear first by the stones then by their fragments and by the dust resulting from their crushing.
  • Each of these blades extends horizontally from a reception zone formed over a part of its length near said axis to receive the stones which arrive through said central supply opening of the ceiling. It continues until a projection edge which is relatively far from this axis and which can be considered as constituting a longitudinally front end of this blade.
  • a stone received on said receiving zone is rotated by this blade and then subjected to centrifugal force. It progresses under the action of this force along this dawn while receiving a thrust which gradually increases its circumferential speed. When it reaches said projection edge, it is projected tangentially to the outside.
  • the dawn extends backwards, from its so-called projection edge, circumferentially behind the natural slope line which is defined by this edge, the natural slope lines being the equilibrium lines of the accumulation slopes that the stones can spontaneously form under the action of centrifugal force upstream of a obstacle which first opposes their flow.
  • the position of such a line is defined by that of the flow threshold formed by this obstacle. This threshold is constituted by the projection edge.
  • This line is approximately a logarithmic spiral around the axis of rotation, that is to say a curve whose tangent makes at all points the same angle with the radial plane passing through this axis and the point considered. This angle depends on the nature, the dimensions and the roughness of the stones to be broken, as well as the intensity of the centrifugal force which maintains the protective layer and which itself depends on the speed of rotation of the rotor.
  • the angle in question, between the radial direction and the tangent to the natural slope line may for example be close to 110 or 120 degrees, and may vary slightly when the gaps between the stones of the protective layer are filled. gradually dust which results from the friction of new stones on this layer.
  • the protective layer thus formed by the first stones protects the dawn, except the projection edge which constitutes the flow threshold, against any wear by the stones which then arrive.
  • the projection edge is formed by a high hardness and / or replaceable part to slow down its wear and / or allow its easy replacement after wear.
  • This piece has the shape of a vertical blade that can be called a projection blade. It is usually made up of two vertical bars of tungsten carbide overlayed and encased in steel supports which are bolted to the front section of the projection blade.
  • peripheral walls of the rotor leave an exit opening for the stones.
  • An external receiving structure surrounds the projection rotor leaving an annular gap around it. It has hard shock surfaces to receive direct shocks from the stones thrown by this rotor and to break these stones by forming fragments of stones and dust. Some of these fragments return towards this rotor and give it shocks in return on its peripheral surface constituted by its peripheral walls and / or on the outer edges of said floor and ceiling. The dust is entrained by the air currents caused by the rotation of the rotor.
  • the external receiving structure is usually a fixed stator, the shock surfaces of which may consist of hard plates called anvils, or by fragments of stones retained in the stator to reduce its wear.
  • the rotors of known crushers described in the documents cited above have, at least as to their floor, a circular shape.
  • the rotors of the Mac Donald, Barmac and SBM Wageneder documents also have an equally circular ceiling superimposed on the floor and a cylindrical peripheral wall joining the edge of this ceiling to that of this floor.
  • the projection blades are arranged in moderate radial projection on the circular peripheral surface of the rotor which therefore forms, circumferentially at the rear of each of these blades, a sector in radial recess relative to this blade. A certain degree of protection is thus ensured in this sector by this blade against said return shocks.
  • the projection blade is, on the contrary, disposed in radial recess relative to the circular peripheral wall of the rotor. It is then protected by the part of the circular peripheral wall which is located immediately in front of the said outlet opening. None protects the peripheral wall.
  • the object of the present invention is to reduce the operating cost of a rotary crusher with self-protected projection vanes without harming the efficiency of this crusher.
  • the peripheral wall and the edges of the floor and the ceiling form, with respect to the circumferential directions, an average progressive retraction angle of between 2 and 10 degrees.
  • This average progressive retraction angle is the characteristic angle of a logarithmic spiral drawn around said axis and starting from said point of maximum radius to arrive at the rear end of said protected sector at the periphery of the rotor, this characteristic angle being the angle constant that the tangents to this spiral make with the tangents to the circles centered on this axis.
  • the peripheral surface of the rotor can deviate below and / or beyond this spiral. This is the case if the peripheral walls of the rotor are made of flat sheets and if the edges of the floor and the ceiling follow these walls.
  • the total angular extent of the sections of said peripheral walls located outside said protected sectors constitutes a minority fraction of the turn of said rotor so as to concentrate said external wear in limited sectors in which replacements and / or recharges can be carried out economically. on these walls.
  • said progressive withdrawal continues until exceeding 10% of said maximum radius, and more preferably, substantially more.
  • the rear fraction mentioned in claim 3 is a minority fraction and experience shows that it can then constitute a complementary protected sector.
  • blades could be two, four or five instead of three, which would correspond to a general shape in elongated parallelogram, or in square or pentagon with cut corners.
  • the rotor comprises, circumferentially in front of each of said outlet openings, a protective element extending far enough to intercept fragments of dangerous stones which could break a part of high hardness forming said projection edge.
  • said protective element in front of each of said outlet openings is a protective plate forming a substantially radial projection on the periphery of said projection rotor, so that said fragments of dangerous stones are intercepted substantially at an angle straight by this protective plate giving it frontal impacts, this protective plate being made up, at least on the front face of a material which is less hard than said high hardness part.
  • this protection plate extends sufficiently downwards and upwards to also protect the lower and upper edges of said outlet opening.
  • said protective plate forms, in plan, an obtuse angle with the part of said peripheral wall situated circumferentially just in front of it, so as to deflect the external air streams which circulate, relative to said projection rotor, in contact with this wall to move away from said outlet opening the stone dust suspended in these air streams.
  • said protection plate is connected to the rear end of said main section of said projection vane, said rear section of this vane being constituted by an extension of this protection plate towards the interior of said projection rotor between said floors. and ceiling so as to allow the maintenance of this protective plate by means of this rear section.
  • the first self-protected projection vane crusher according to the invention has a vertical axis A and it includes a projection rotor 1.
  • the latter is mounted on a vertical shaft 2 provided with protected bearings which are not visible in the figure.
  • This shaft is driven in rapid rotation, for example at 1110 revolutions per minute, by a motor 5 by means of pulleys 3A and 3B and belts 4.
  • the rotor 1 has a floor 8 and a ceiling 9. The latter is pierced with a central circular opening in which engages a vertical chimney 6 channeling the stones from a hopper 7. This chimney is provided with a device 15 allowing its level in the rotor to be corrected as it is worn by the stones which constitute the material to be crushed.
  • the stator of the first crusher is constituted by a horizontal circular crown 11 which constitutes the bottom of a stone box.
  • a vertical cylinder 12 constitutes the external wall of this stator and of the crusher. It is shielded in its upper part, above the level of the crushed material 13. This consists of fragments of the stones which have been introduced into the hopper 7. A certain volume is retained in the stone box.
  • the stator is closed around the chimney 6 by a horizontal shielded cover 14.
  • the crushed material exits towards the lower part of the stator through the annular gap 10 existing between the rotor and the stone box. It is extracted through a conical bottom 17 then evacuated on a means of transport such as a belt conveyor, to a hopper or other means of storage.
  • FIG. 2 shows the same side view in axial section of a second crusher which may differ from the first only by its stator: the stone box 13 of the first is replaced in the second by anvils 19.
  • the cylindrical casing of the stator 12 is then equipped with an anvil ring 18 allowing the anvils 19 to be nested and moved vertically by three ramps 18A arranged at 120 °.
  • FIG. 3 represents a view in horizontal section of a polygonal rotor in which said number N is three.
  • This rotor has practically the shape of an equilateral triangle with cut corners. The direction of its rotation is represented by an arrow F.
  • This one-piece construction rotor consists of a horizontal ceiling 9 not visible in this view, a floor 8 also horizontal, made of very thick sheets, and vertical plates 20 , 21, 24, and 25 constituting three projection vanes. Each blade constitutes both a peripheral wall of the rotor and a guide and acceleration wall for the stones to be crushed. Each of these vertical plates constitutes a section of one of these blades.
  • Each blade is mainly made up of a main section 20 comprising a majority front fraction 20A and a minority rear fraction 20B on either side of a point located at a minimum distance from the axis A.
  • the front end of this section is welded to a front section 21.
  • the latter forms a small side of said polygon and its front end is formed by the projection edge 22 which is for example located 47 cm from the axis A.
  • the latter is formed on a projection blade 22A constituted by two superimposed removable pieces of steel 22B and 22C each comprising two vertical bars of tungsten carbide.
  • One of these bars 22D or 22E constitutes a part of the edge 22 and the other such as 23 constitutes a part of a protective bar which increases the longevity of this part.
  • the parts 22B and 22C are fixed to the fixed part of the front plate 21 by two bolts 31.
  • FIG. 5 which represents a side view of the same front plate from the inside of the rotor makes it possible to see these two parts 22B and 22C superimposed, interchangeable, and carrying bars of partial tungsten carbide of identical characteristics such as 22D and 22E. Since wear occurs essentially towards the middle of the front plate, this makes it possible to interchange the parts 22B and 22C to increase the longevity.
  • the protective bars such as 23 can be replaced by a hard protective coating such as 23A formed on the exposed surface of each of two parts such as 22F similar to parts 22B and 22C.
  • This coating advantageously consists of small rounded particles or tungsten carbide balls embedded in a binder such as a cobalt nickel alloy.
  • the main section 20 of the blade comes by its rear end to limit the outlet opening 21A of the next projection blade.
  • a protective plate 24 projects in front of this outlet opening. Its circumferentially front face is equipped with a removable wear plate 24B which carries screws 24C which allow it to be fixed using nuts 24D on the circumferentially rear face of the plate 24.
  • This wear plate is made up hard alloy steel or chromium cast iron resistant to abrasion, while the rotor assembly is made of a less hard steel and easier to machine and weld. Said hard alloy steel is chosen to be both sufficiently ductile to withstand the most severe frontal impacts well, and sufficiently hard to resist erosion by scraping for a long time.
  • the plate 24 thus equipped deflects the fragments which ricochet from the stator as well as the air streams loaded with dust and sand created by the rapid rotation of the rotor. In doing so, it contributes to the protection of the projection blade 22A and it protects the edges of the floor 8 and of the ceiling 9 around the outlet opening.
  • the radially outer end of the protective plate can be placed at a radius, that is to say at a distance from the axis A, slightly greater than that of the projection blade 22A as shown in FIG. 3. However, it can also be placed at an equal or slightly smaller radius (see fig. 8) while usefully protecting this blade, perhaps with the help of stones and the air stream exiting through the outlet opening 21 A.
  • Each protective plate 24 is placed practically in the radial position. It is connected to a minority rear fraction of the main section 20 of the previous projection vane with which it forms an obtuse angle favoring the deviation outdoor air nets. This protective plate also extends inside the rotor. Its inner part 24A constitutes both a rear section of the projection vane, with a retaining role towards the rear of the protective layer, and a rear stiffener for the main section 20 of this vane.
  • Each projection vane is equipped with at least one intermediate stiffener 25 projecting inwardly to reinforce the retention. Said receiving zone for the stones on this blade extends between these two stiffeners 24A and 25.
  • Wear plates 26 protect the floor 8 in areas where it is not naturally protected by the layer of material held in the rotor. These wear plates are naturally held in place by centrifugal force, without bolting, thanks to cleats 27, 28, 29 fixed for this purpose to the floor.
  • a hole 38 drilled in the floor 8 receives a solid disc 30 called a distributor.
  • the latter has a diameter of the order of one third of that of the rotor, that is to say that of the circle circumscribed to the rotor. It projects from the floor 8 and has two functions: distributing the material received towards the projection vanes and fixing the rotor 1 on the axis of rotation 2, as will be explained with the aid of FIG. 7.
  • the rotor 1 is carried and driven by means of its floor 8.
  • the latter is itself carried and driven not directly by the shaft 2 but by a support plate 34 which is mounted by conventional mechanical means on the end upper part of shaft 2, the diameter of which is much smaller.
  • This carrier plate is separable from the rotor. It has a diameter slightly greater than half that of the floor 8 and its thickness is sufficient to give it all the desired rigidity. Its presence ensures the rigidity of the rotor while giving only a moderate thickness to the floor.
  • the horizontal translational displacements of the rotor are prevented by the fact that the floor 8 comprises on the lower face, around its central hole 38, a central annular protuberance 40 which, when stationary, is inserted with very little play in a housing central 44 of the carrier plate 34 and which, in service, bears against the retaining shoulder 42 which constitutes the edge of this housing.
  • the distributor 30 is fixed to the shaft by a single axial screw 33 disposed in an axial well 32 of this distributor. This well is filled in service with stones which protect the head of this screw against wear. A small gap is made between the peripheral surface of the distributor and the edge of the hole drilled in the floor 8. The latter is held by an intermediate washer 36 blocked under the distributor 30.
  • the peripheral surface of this washer is slightly conical, in male cone with point downwards, and comes to bear precisely on the internal surface of the annular protuberance 40, which is machined according to a corresponding female cone. Under these conditions, the risk of wear of the intermediate washer 36 is very low since its position provides protection by the distributor 30 and the floor 8.
  • the floor 8 and the ceiling 9 are respectively protected by removable wear plates 26 and 26A.
  • Figure 8 is a horizontal sectional view of a rotor with five blades. There are elements similar to all the essential components of the previous rotor with three blades. These analogous elements are designated by the same reference numbers increased by 100.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Toys (AREA)
  • Saccharide Compounds (AREA)
  • Disintegrating Or Milling (AREA)
  • Mechanisms For Operating Contacts (AREA)
EP88101235A 1987-01-30 1988-01-28 Concasseur rotatif à aubes de projection autoprotégées Expired - Lifetime EP0276848B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88101235T ATE67433T1 (de) 1987-01-30 1988-01-28 Rotierender brecher mit geschuetzten schleuderradschaufeln.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8701159 1987-01-30
FR8701159A FR2610217B1 (fr) 1987-01-30 1987-01-30 Concasseur rotatif a aubes de projection autoprotegees

Publications (3)

Publication Number Publication Date
EP0276848A2 EP0276848A2 (fr) 1988-08-03
EP0276848A3 EP0276848A3 (en) 1989-03-01
EP0276848B1 true EP0276848B1 (fr) 1991-09-18

Family

ID=9347447

Family Applications (2)

Application Number Title Priority Date Filing Date
EP88101236A Expired - Lifetime EP0276849B1 (fr) 1987-01-30 1988-01-28 Concasseur rotatif à aubes de projection protégées
EP88101235A Expired - Lifetime EP0276848B1 (fr) 1987-01-30 1988-01-28 Concasseur rotatif à aubes de projection autoprotégées

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP88101236A Expired - Lifetime EP0276849B1 (fr) 1987-01-30 1988-01-28 Concasseur rotatif à aubes de projection protégées

Country Status (10)

Country Link
EP (2) EP0276849B1 (da)
AT (2) ATE65944T1 (da)
DE (2) DE3864031D1 (da)
DK (2) DK166906B1 (da)
ES (2) ES2026209T3 (da)
FR (1) FR2610217B1 (da)
GR (2) GR3003051T3 (da)
IE (2) IE60187B1 (da)
NO (2) NO172676C (da)
ZA (2) ZA88652B (da)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT403998B (de) * 1996-11-20 1998-07-27 Mfl Mahltechnik Liezen Ges M B Prallmühle

Families Citing this family (18)

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Publication number Priority date Publication date Assignee Title
US4940188A (en) * 1987-12-24 1990-07-10 John Rodriguez Tip holder for mineral breaker
US4923131A (en) * 1988-06-06 1990-05-08 Rossouw Pieter J Rotary impact crusher rotor
JPH0783837B2 (ja) * 1988-12-05 1995-09-13 コトブキ技研工業株式会社 遠心破砕機とその破砕方法及び破砕片の仕分け方法
DE3843338A1 (de) * 1988-12-22 1990-06-28 Krupp Polysius Ag Sichter
DE3844181A1 (de) * 1988-12-29 1990-07-05 Orenstein & Koppel Ag Einrichtung zum zerkleinern und klassieren schuettfoermiger gueter
US5680994A (en) * 1989-07-10 1997-10-28 Wastenot International Ltd. Mill for grinding garbage or the like
FR2676661A1 (fr) * 1991-05-23 1992-11-27 Drac Isere Concassage Sa Broyeur a axe vertical.
DE4215911C2 (de) * 1992-05-14 1996-01-04 Wifag Maschf Falzklappen-Zylinder
NZ250027A (en) * 1993-10-22 1996-10-28 Barmac Ass Ltd Mineral breaker; scalloped wear tip
DE19631734C2 (de) * 1996-08-06 1998-07-02 Steckert Martin Prallbrecher
US6405953B1 (en) 1999-07-30 2002-06-18 Impact Service Corporation Impeller shoe for an impact crusher
US7416146B2 (en) * 2001-08-02 2008-08-26 Kennametal Inc. Wear resistant center feed impact impeller
KR100656731B1 (ko) 2004-12-22 2006-12-12 (주)거산기계 순환 골재 샌드밀
US7427042B2 (en) * 2005-11-16 2008-09-23 Damian Rodriguez Wear tip for rotary mineral breaker
CN102641768A (zh) * 2012-04-01 2012-08-22 衢州美安普矿山机械有限公司 一种转子及装备该转子的立轴式冲击破碎机
CN110508375A (zh) * 2019-08-15 2019-11-29 晏斯华 一种粉碎方法、旋流式对撞粉碎机构及多极粉碎装置
WO2022008054A1 (en) 2020-07-09 2022-01-13 Sandvik Srp Ab A wear plate assembly
CN113649159A (zh) * 2021-07-02 2021-11-16 南昌矿山机械有限公司 设有中心通道锥的立轴式冲击破碎机及进料分料方法

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
US2985391A (en) * 1959-12-24 1961-05-23 Benjamin J Parmele Rotary disc pulverizer
US3174697A (en) * 1962-07-30 1965-03-23 Adams Engineering Impeller
US3168991A (en) * 1963-11-20 1965-02-09 Pettibone Muiliken Corp Vertical shaft rock crusher with abbreviated table
US3970257A (en) * 1972-10-05 1976-07-20 Macdonald George James Apparatus for reducing the size of discrete material
NZ201190A (en) * 1982-08-07 1986-07-11 Barmac Ass Ltd Additional wear tip for rotary mineral breaker
AT381246B (de) * 1984-12-04 1986-09-10 Wageneder Sbm Gmbh Prallmuehle zum zerkleinern von gestein od.dgl.
DE3610974A1 (de) * 1986-04-02 1987-10-08 Bhs Bayerische Berg Horizontal-schleudermuehle, insbesondere zum zerkleinern von abrasivem gestein
AT390568B (de) * 1986-10-30 1990-05-25 Wageneder Sbm Gmbh Prallmuehle zum zerkleinern von gestein od. dgl.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT403998B (de) * 1996-11-20 1998-07-27 Mfl Mahltechnik Liezen Ges M B Prallmühle

Also Published As

Publication number Publication date
EP0276849A3 (en) 1989-03-01
NO165869B (no) 1991-01-14
DK166906B1 (da) 1993-08-02
ES2023957B3 (es) 1992-02-16
IE60187B1 (en) 1994-06-15
EP0276848A3 (en) 1989-03-01
NO880359L (no) 1988-08-01
DK45988D0 (da) 1988-01-29
IE880252L (en) 1988-07-30
GR3003051T3 (en) 1993-02-17
ATE65944T1 (de) 1991-08-15
DE3864031D1 (de) 1991-09-12
ATE67433T1 (de) 1991-10-15
ZA88652B (en) 1988-10-26
DE3864840D1 (de) 1991-10-24
EP0276849A2 (fr) 1988-08-03
EP0276848A2 (fr) 1988-08-03
ZA88651B (en) 1988-10-26
NO880360D0 (no) 1988-01-28
NO880360L (no) 1988-08-01
FR2610217A1 (fr) 1988-08-05
NO172676C (no) 1993-08-25
NO165869C (no) 1991-04-24
NO880359D0 (no) 1988-01-28
NO172676B (no) 1993-05-18
ES2026209T3 (es) 1992-04-16
DK46088A (da) 1988-07-31
GR3003269T3 (en) 1993-02-17
FR2610217B1 (fr) 1991-08-16
EP0276849B1 (fr) 1991-08-07
DK46088D0 (da) 1988-01-29
DK45988A (da) 1988-07-31
IE60186B1 (en) 1994-06-15

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