EP0031039B1 - Radôme en forme de tour pour installations radiotechniques - Google Patents

Radôme en forme de tour pour installations radiotechniques Download PDF

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Publication number
EP0031039B1
EP0031039B1 EP80107282A EP80107282A EP0031039B1 EP 0031039 B1 EP0031039 B1 EP 0031039B1 EP 80107282 A EP80107282 A EP 80107282A EP 80107282 A EP80107282 A EP 80107282A EP 0031039 B1 EP0031039 B1 EP 0031039B1
Authority
EP
European Patent Office
Prior art keywords
edge
mast
sheathing according
section
fastened
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
Application number
EP80107282A
Other languages
German (de)
English (en)
Other versions
EP0031039A1 (fr
Inventor
Artur Göbel
Hartmut Patschke
Rudolf Göbel
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.)
G&H Montage GmbH
Original Assignee
G&H Montage GmbH
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
Priority claimed from DE19792951590 external-priority patent/DE2951590A1/de
Priority claimed from DE19803024505 external-priority patent/DE3024505A1/de
Application filed by G&H Montage GmbH filed Critical G&H Montage GmbH
Priority to AT80107282T priority Critical patent/ATE12856T1/de
Publication of EP0031039A1 publication Critical patent/EP0031039A1/fr
Application granted granted Critical
Publication of EP0031039B1 publication Critical patent/EP0031039B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome

Definitions

  • the invention relates to a tower-like cladding for protecting radio-technical systems, in particular antennas, against the weather, according to the preamble of claim 1.
  • Such a cladding is known from DE-B-1 2.73 023.
  • segments of rigid polyurethane foam are prefabricated in easily transportable sizes and connected at the construction site by gluing, so that individual, for example 12-segment, sleeve-shaped wefts are formed which, when stacked, can form the tower-like cladding, for example of antennas.
  • the self-supporting cladding which is self-supporting in the manner described, is secured at the sides by structures arranged on the antenna mast, in particular in the area or in the form of the platforms of conventional radio antenna masts arranged one above the other.
  • antennas in particular radio antennas
  • radio antennas are known to be installed in exposed locations such as hills, mountains, buildings, such as television towers, etc.
  • the antenna masts and their cladding are regularly exposed to considerable wind loads.
  • These wind loads lead to corresponding pressure and suction loads when flowing around the panel, which seek to deform the panel.
  • the wind loads often lead to very significant vibrations, in particular the long antenna mast and, due to the vibration excitation by eddy detachment at the periphery of the cladding and the structure supporting it, to natural vibrations, in particular of the antenna mast, the vibrations of which are in turn introduced into the cladding.
  • the wall made of rigid foam of the cladding is subject to considerable, rapidly changing tensile and buckling stresses, which leads to considerable and disruptive noise.
  • the changing and swelling permanent loads on the cladding lead to material fatigue and thus to failures.
  • the invention has for its object to provide a cladding of the type outlined in the preamble of claim 1, the material of which is subjected to considerably lower loads, so that the service life is increased and, if necessary, noise can be reduced.
  • the axially movable bearing preferably the upper edge of the weft, enables lateral oscillation deflections of the antenna mast without introducing significant tensile or buckling stresses into the material of the casing.
  • the cladding does not produce any disturbing amounts of noise even in stormy weather, and the considerably reduced service life of the cladding results from the considerable reduction in mechanical material stress.
  • edge of at least the axially movable end of each shot is bordered by a border profile made of wear-resistant material such as glass-fiber reinforced unsaturated polyester, this edge can serve for a clean anchoring of a reinforcement without damaging the rigid foam, but with which an axially movable, but transversely to this, however immobile connection to the structure.
  • the axially movable end of each shot is nevertheless secured in the transverse direction to the axis of the mast and can therefore not make any relative movements to the adjacent, rigidly attached edge of the adjacent shot transversely to the movement joint.
  • the result is that although the width of the expansion joint can vary under wind forces, for example, the edges of the expansion joint are always in alignment.
  • a masking tape which consists of wear-resistant material such as glass fiber reinforced unsaturated polyester, so that no open gap appears in the region of the movement joint, through which z. B. driving rain could penetrate into the interior of the panel.
  • the position of the edges of the movement joint in their direction of escape ensures a clean contact of the side edges of the masking tape on the outside of the edge areas of adjacent shots, without the masking tape having to follow relative changes in the position of its contact surfaces on the adjacent shots.
  • the masking tape can be made relatively stiff and strong for effective protection and is itself not exposed to any significant stresses that could lead to leaks and material fatigue.
  • a tower-like cladding is thus created which is completely closed all around and functionally corresponds in its entirety to a generic cladding, but is free from excessive material stresses and in particular without noise.
  • Fig. 1, 1 denotes a concrete tip of a television tower, on which an antenna mast 2 is placed, which carries a plurality of radio antennas, not shown, on its circumference in a manner known per se.
  • nine supporting structures 3 designed as platforms are attached to the circumference of the antenna mast, the diameter of which gradually becomes smaller towards the top, and which serve as a carrier for a shell, denoted overall by 4, as a covering for the antenna mast 2.
  • the mutual spacing of the platforms or supporting structures 3 may be approximately 4.8 m, with a height difference of over 40 m resulting between the upper edge of the concrete tip 1 of the television tower and an upper roof 5 of the casing 4.
  • the diameter of the sheath 4 may drop from 4.6 m at the lower end to approximately 2.5 m in the area of the roof 5 with a base-side diameter of the antenna mast 2 of approximately 1.7 m.
  • considerable vibrations of the antenna mast 2 occur when there is a wind load, as well as significant natural vibrations of the elongated antenna mast 2 when resonating with vortex detachment frequencies, which in the case of a rigid attachment of the Shell 4 are transmitted as tensile and buckling stresses in the peripheral wall, which causes noise and leads to premature material fatigue.
  • the casing 4 consists of a plurality of shots 6 in the example case of the same height between the individual structures 3 and a shorter, shorter section 7 on the foot side and a shorter, shorter section 8 on the roof side.
  • Each section 6, 7 or 8 is made in the manner known per se.
  • a plurality of, for example, twelve circumferential individual segments are assembled in a manner not shown in detail, the individual segments abutting one another at folded butt joints and glued to one another there at the construction site.
  • the bottom shot 7 sits on the correspondingly formed upper edge of the concrete tip 1, while the overlying shots 6 and 8 are fastened with their undersides to the corresponding structures in the manner explained in more detail below, while the tops of the shots 6 and 7 in the direction the axis of the antenna mast 2 and the sheath 4, designated 9, are movably mounted.
  • FIG. 2 corresponds to the detail according to circle 11 in FIG. 1 on an enlarged scale
  • FIG. 3 shows a section along line III-III in FIG 2 corresponds.
  • the supporting structure 3 consists of an on-site platform or console 10 of any type, which can be a steel structure or can optionally also consist of concrete, as well as a supporting device 11 for the casing 4 attached to it.
  • the support device 11 consists in the example of a plurality, preferably one of the number of individual segments for each shot 6 corresponding number of steel tabs 12, which are fixed in the manner shown in FIGS. 2 and 3 by massive bolts 13 on the top of the console 10 in such a way are that they protrude radially beyond the outer edge 10 'of the console 10.
  • a support tab 14 is welded, which is also made of steel and forms the lower support for the lower edge of the upper shot 6, designated 15.
  • an angle rail 16 following the shape of the lower edge 15 of the upper weft 6 is placed on the upper side of the carrying tab 14, on which the lower edge 15 of the upper edge is explained in a manner to be explained in more detail below Shot 6 is rigidly attached.
  • a further tab 17 is held by the screw bolts 13, which can be made of glass fiber reinforced plastic such as epoxy resin and also radially projects beyond the radial outer edge 10 'of the bracket 10.
  • a base plate 19 is fastened to the underside of the tab 17 by means of screw bolts 18 and nuts 14 '.
  • a T-shaped stiffening structure 20 which can be seen in section in FIG. 3, is provided, which is welded to the bracket 14 and the base plate 19, so that a box-shaped housing results.
  • two guide bolts 21 are arranged vertically and parallel to one another between the upper support bracket 14 and the lower base plate 19 and fastened, for example, by welding.
  • the upper edge of the lower shot 6, designated 22, is provided with a reinforcement 23, which consists of an angle rail 24 adapted to the shape of the upper edge 22 of the lower shot 6 on the upper end face 25 of the shot 6 and of a bracket angle 26.
  • the angle rail 24 is connected in the region of its leg 27 parallel to the end face 25 of the lower weft 6 by four screw bolts 28 to a parallel leg 29 of the bracket angle 26 in the example.
  • the leg 30 of the angle rail 24 which is at an angle to the leg 27 is located on the inside of the upper edge 22 of the lower shot 6 and points downwards.
  • the leg 30 serves to fix the angle rail 24 with respect to the upper edge 22 of the lower shot 6 by a number of screw bolts 31, which clamp the upper edge 22 of the lower shot 6 against the leg 30 of the angle rail 24. In this way, the reinforcement 23 is attached via the leg 30 of the angle rail 24 to the upper edge 22 of the lower shot 6.
  • the second leg of the bracket bracket 26 is formed by two guide sleeves 32, which the guide bolts 21 with good interposition of bushings 33 Grip sliding properties, for example made of polyethylene.
  • the upper edge 22 of the lower weft 6 with the reinforcement 23 attached to it is thereby held vertically movable in the direction of the guide bolts 21, but is laterally guided cleanly on the guide bolts 21.
  • the guide sleeves 32 can slide vertically on the guide pin 21 and there are no noticeable tensile or buckling forces in the wall of the shot 6 from the top thereof Edge 22 introduced here.
  • the angled rail 16 at the lower edge of the upper weft 6 is a mirror image of the angled rail 24 and with a horizontal leg 34 on the lower end face 35 of the upper weft 6, while the angled leg 36 rotates on the inside of the weft 6.
  • the angle rails 16 and 24 run over at least a large part of the circumference of the lower edge 15 and the upper edge 22 of the respective weft 6, while the support bracket 14 and the bracket angle 26 only reach about the width of the steel plate 12.
  • the angle rail 16 is fastened on the lower edge 15 of the associated weft 6 by means of screw bolts 37 which essentially horizontally penetrate the wall of the weft 6 made of rigid foam, in particular rigid polyurethane foam, and the lower edge 15 clamp against the leg 36 of the angle rail 16.
  • screw bolts 37 which essentially horizontally penetrate the wall of the weft 6 made of rigid foam, in particular rigid polyurethane foam, and the lower edge 15 clamp against the leg 36 of the angle rail 16.
  • the lower edge 15 of the upper weft 6 is rigidly fixed against the supporting structure 3, the connection between the angle rail 16 and the supporting bracket 14 being effected by means of bolts 38 similar to the bolts 28.
  • an expansion or movement joint 39 with a sufficiently large gap between the reinforcement 23 and the support bracket 14 is provided on the end faces 25 and 35 of the adjacent sections 6.
  • An annular soft seal 40 is arranged in the movement joint 39, which is indicated in FIG. 2 only by dash-dotted outer contours for the sake of clarity.
  • the soft seal 40 consists, for example, of closed-cell neoprene foam or a similar material, which has a compressibility of up to about 90 percent with a slight rise in back pressure, i.e. can be compressed to a tenth of its height without substantial tension build-up, so that the soft seal 40 changes the height of the gap Expansion joint 39 can follow.
  • border profiles 41 and 42 which can be made of a wear-resistant material such as glass fiber reinforced, unsaturated polyester.
  • the side walls of the Einfberprofile 41 and 42 are covered up to an area over the sides of the edges 15 and 22, which is outside the attack of any fastening or covering.
  • each movement joint 39 between adjacent sections 6 is covered by a masking tape 43 on its outside.
  • the cover band 43 running all the way around on the outside of the movement joint 39 is expediently clamped in its upper part by the screw bolts 37, which fix the lower edge 15 of the upper weft 6 against the associated angle rail 16, while its lower end engages over the head of the screw bolts 31, which fix the upper edge 22 of the lower shot 6 against the angle rail 24.
  • the lower end of the cover band 43 is slidably held relative to the upper edge 22 of the lower weft 6 and can slide along the corresponding border profile 42.
  • the fixing could also take place at the lower end of the cover band 43 and, for this purpose, its upper end slide on the border profile 41 for the lower edge 15 of the upper weft 6.
  • the adjacent side wall of the lower border profile 42 engages under the lower end of the cover band 43 to such an extent that relative movements can occur, so that with all occurring relative movements a clean flat contact of the lower end or edge of the cover band 43 is ensured on an adjacent surface of the border profile 43.
  • the masking tape 43 is likewise constructed from individual segments, similar to the wefts 6, which is not shown in more detail, the individual segments abutting one another with folded butt joints which are offset in the wefts 6 with respect to the butt joints.
  • the border profiles 41 and 42 can also be constructed from individual segments.
  • FIG. 4 is a modified embodiment in a representation corresponding to FIG. 2 the area of the expansion joint between two shots.
  • Components which correspond to the embodiment according to FIG. 2 are identified by the same reference numerals as in FIG. 2, but with the index “a”, so that the drawing according to FIG. 4 largely excludes the explanations relating to FIGS. 2 and 3 yourself is understandable.
  • On the inside of the cover band 43a there is an additional sealing band 44, which extends into the contact area on the border profiles 41a and 42a, where it results in an additional seal.
  • the sealing tape 44 can be made of neoprene, for example.
  • Additional sealing of the gap area of the movement joint 39 or 39a can be achieved in both embodiments by additional sealing tapes 45 or 45a on the edges of the masking tapes 43 or 43a, so that overall a gradual penetration of moisture is reliably avoided despite the considerable relative movement that occurs can.
  • a further difference of the embodiment according to FIG. 4 to that of FIG. 2 is that a support bracket 14a for supporting the lower end face 35a of the lower edge 15a of the upper shot 6a is fastened in the bottom region of a support structure, designated overall by 46, which is fastened by a Bolt 37a for fixing the lower edge 15a of the upper shot 6a is penetrated, so that the angle rail 16 according to FIG. 2 is omitted.
  • At least one guide pin 21a is fastened, in particular welded, which axially projects on its underside beyond the plane of the support bracket 14a and the support structure 46 and there forms the guide section for a guide sleeve 32a with a plastic bushing 33a, which is attached to a reinforcement 23a of the upper edge 22a of the lower shot 6a is provided.
  • the lower angle rail 24 is omitted in that a bracket angle 26a carries the vertical guide sleeve 32a in one horizontal leg and with its other leg 29a, which is used for fastening to the upper edge 22a of the weft 6a, which in the embodiment according to FIG 4, however, runs vertically, is directly penetrated by the fastening bolts 31 a.
  • the soft seal 40a arranged in the gap area of the movement joint 39a therefore lies directly against the end face 25a of the upper edge 22a of the lower weft 6a.
  • the support structure 46 is fastened in a manner not shown to a bracket 10 or the like, and is therefore fixed against the antenna mast 2, while the upper edge 22a of the lower section 6a with its reinforcement 23a while reducing or increasing the gap height of the expansion joint 39a compared to the lower one Edge 15a of the upper shot 6a is movable, the guide sleeve 32a sliding on the guide pin 21a.
  • the guide sleeve 32 or 32a can be assigned to the supporting structure 3, while a corresponding guide pin 21 or 21a, conversely, is assigned to the reinforcement 23 or 23a.
  • the hard foam material of the shots 6a can absorb tensile loads as well as compressive loads, it would also be possible to fix the upper edge 22 or 22a of each shot 6 or 6a on the supporting structure 3 and instead the lower edge 15 or 15a in a corresponding manner keep agile.

Landscapes

  • Support Of Aerials (AREA)
  • Details Of Aerials (AREA)
  • Building Environments (AREA)
  • Casings For Electric Apparatus (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)

Claims (9)

1. Revêtement du type tour (4; 4a) pour la protection d'installations technique de radio comportant un pylône (2) en partucilier d'antennes contre les intempéries, comprenant un certain nombre de tronçons (6; 6a) de matériau mousse dur, en particulier à base de polyuréthane, disposées l'un au-dessus de l'autre coaxialement par rapport au pilône (2) et appuyés contre les pi- lônes (2) au moyen de charpente (3) fixées au pylône (2) dans plusieurs plans disposés l'un au-dessus de l'autre, caractérisé par le moyen,
a) que chaque tronçon (6; 6a) est séparé du tronçon viosin, disposé au-dessus ou au-dessous de lui, par un joint de déplacement (39; 39a),
b) que chaque tronçon (6; 6a) est rigidement fixé à l'une de ces extrémités, de préférence à son bord inférieur (15; 15a), à l'une des charpentes (3) et à son autre extrémité, de préférence à son bord supérieur (22; 22a), est maintenu mobile axialement,
c) que le bord (22; 22a) de l'extrémité mobile axialement de chaque tronçon (6; 6a) est bordé par un profil de bordage (42; 42a) en matériau résistant à l'usure et qu'il est muni d'une monture (23; 23a) avec laquelle l'extrémité mobile axialement est guidée, avec sécurité de position, contre la charpente (3) dans la direction transversale par rapport à l'axe (9) du pylône (2), et
d) que le joint de déplacement (39; 39a) est recouvert, au moins sur sa face externe, par une bande de recouvrement (43; 43a) en particulier en polyester non saturé armé de fibres de verre.
2. Revêtement selon la revendication 1, caractérisé en ce que le joint de déplacement (39; 39a) est ponté par au moins une garniture d'étan- chéîté douce (40; 40a) en particulier en mousse de néoprène à cellules fermées entre les surfaces frontales (25; 25a ou 35; 35a) sur les bords mobiles l'un par rapport à l'autre (15; 15a ou 22; 22a) des tronçons voisins (6; 6a).
3 Revêtement selon la revendiation 1 ou la revendication 2, caractérisé en ce qu'au moins la paroi latérale extérieure du profilé de bordage (42; 42a) est recouverte par au moins le bord voisin, mobile en glissement, de la bande de recouvrement (43; 43a).
4. Revêtement selon l'une des revendication 1 à 3, caractérisé en ce que contre les bords latéraux de la bande recouvrement (43; 43a) il est chaque fois prévue une bande d'étanchéité (45; 45a) parallèle au bord.
5. Revêtement selon l'une des revendications 1 à 4, caractérisé en ce que la bande de recouvrement (43; 43a) est constituée d'un certain nombre de pattes individuelles de recouvrement en forme de segment qui butent l'une contre l'autre avec des joints de préférence à feuillure et.
6. Revêtement selon la revendication 5, caractérisé en ce que les joints des pattes de recouvrement sont disposés décalés par rapport aux joints qui existent entre les différents segments des tronçons (6; 6a).
7. Revêtement selon l'une des revendications 1 à 6, caractérisé en ce qu'à la charpente (3) qui supporte le tronçon supérieur (6; 6a) est fixée au moins une broche de guidage verticale (21; 21 a) sur laquelle est portée, avec possibilité de déplacement par glissement, la monture (23; 23a) fixée au bord supérieur (22; 22a) du tronçon inférieur (6; 6a)..
8. Revêtement selon la revendication 7, caractérisé en ce que la monture (23; 23a) présente une douille de guidage (32; 32a) qui enserre la broche de guidage (21; 21a).
9. Revêtement selon la revendication 8, caractérisé en ce que la douille de guidage (32; 32a) est fourrée d'un manchon continu (33; 33a), en particulier en plastique comme du polyéthylène.,
EP80107282A 1979-12-21 1980-11-21 Radôme en forme de tour pour installations radiotechniques Expired EP0031039B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80107282T ATE12856T1 (de) 1979-12-21 1980-11-21 Turmartige verkleidung fuer funktechnische anlagen.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19792951590 DE2951590A1 (de) 1979-12-21 1979-12-21 Turmartige verkleidung fuer funktechnische anlagen
DE2951590 1979-12-21
DE19803024505 DE3024505A1 (de) 1980-06-28 1980-06-28 Turm- oder kuppelartige verkleidung fuer funktechnische anlagen
DE3024505 1980-06-28

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP84102934.1 Division-Into 1984-03-16

Publications (2)

Publication Number Publication Date
EP0031039A1 EP0031039A1 (fr) 1981-07-01
EP0031039B1 true EP0031039B1 (fr) 1985-04-17

Family

ID=25782554

Family Applications (2)

Application Number Title Priority Date Filing Date
EP84102934A Ceased EP0131682A1 (fr) 1979-12-21 1980-11-21 Revêtement pour une antenne
EP80107282A Expired EP0031039B1 (fr) 1979-12-21 1980-11-21 Radôme en forme de tour pour installations radiotechniques

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP84102934A Ceased EP0131682A1 (fr) 1979-12-21 1980-11-21 Revêtement pour une antenne

Country Status (6)

Country Link
US (1) US4377812A (fr)
EP (2) EP0131682A1 (fr)
CA (1) CA1144630A (fr)
DE (1) DE3070528D1 (fr)
DK (1) DK543280A (fr)
NO (1) NO154140C (fr)

Cited By (1)

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KR101088491B1 (ko) 2006-10-02 2011-11-30 보레알리스 테크놀로지 오와이. ＣｌＯ２ 함유수에 대한 저항성이 증가된 폴리올레핀 조성물

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DE3037726A1 (de) * 1980-10-06 1982-05-19 G + H Montage Gmbh, 6700 Ludwigshafen Verkleidung zum schutz funktechnischer anlagen, insbesondere von antennen
GB8620372D0 (en) * 1986-08-21 1987-12-16 Vickers Shipbuilding & Eng Structures
US5392056A (en) * 1992-09-08 1995-02-21 Deteso; John S. Protective sheath for broadcast antennas
AU7495398A (en) * 1997-05-20 1998-12-11 Stealth Network Technologies, Inc. Shell and support structure for enclosing an antenna mounted on an elongated member
US6578339B1 (en) 2000-03-31 2003-06-17 Mcginnis Henry J. Sectional tower with intermediate legs
ES2190748B1 (es) * 2001-11-23 2005-09-01 Att Consultoria De Proyectos, S.L. Torre mimetizada para cubiertas.
GB0306075D0 (en) * 2003-03-18 2003-04-23 Renewable Devices Ltd Wind turbine
CN1328821C (zh) * 2003-04-11 2007-07-25 北京玻璃钢研究设计院 一种水下潜艇用天线罩及其制备方法
DE10336073A1 (de) * 2003-08-06 2005-03-10 Kathrein Werke Kg Antennenanordnung
US6940469B2 (en) * 2003-08-06 2005-09-06 Kathrein-Werke Kg Antenna arrangement
US7116282B2 (en) * 2003-10-14 2006-10-03 John Trankina Tower reinforcement
US8125403B2 (en) * 2006-03-20 2012-02-28 Telefonaktiebolaget L M Ericsson (Publ) Tubular telecom tower
US8085207B2 (en) * 2008-08-05 2011-12-27 Caterpillar Forest Products Inc. Antenna guard
US8970438B2 (en) * 2011-02-11 2015-03-03 Telefonaktiebolaget L M Ericsson (Publ) Method of providing an antenna mast and an antenna mast system
SE536447C2 (sv) * 2012-03-27 2013-11-05 Induflex AB Spännanordning för att spänna ut en radomduk
US10446901B1 (en) 2018-10-16 2019-10-15 Science Applications International Corporation System and method for guarding an antenna from interfering physical objects

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US3175652A (en) * 1960-12-14 1965-03-30 Means for interconnecting adjacent wall sections
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101088491B1 (ko) 2006-10-02 2011-11-30 보레알리스 테크놀로지 오와이. ＣｌＯ２ 함유수에 대한 저항성이 증가된 폴리올레핀 조성물

Also Published As

Publication number Publication date
DK543280A (da) 1981-06-22
NO154140C (no) 1986-07-23
EP0131682A1 (fr) 1985-01-23
US4377812A (en) 1983-03-22
NO154140B (no) 1986-04-14
DE3070528D1 (en) 1985-05-23
CA1144630A (fr) 1983-04-12
EP0031039A1 (fr) 1981-07-01
NO803814L (no) 1981-06-22

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