DK152994B - Lydabsorberende bygningselement - Google Patents
Lydabsorberende bygningselement Download PDFInfo
- Publication number
- DK152994B DK152994B DK218180AA DK218180A DK152994B DK 152994 B DK152994 B DK 152994B DK 218180A A DK218180A A DK 218180AA DK 218180 A DK218180 A DK 218180A DK 152994 B DK152994 B DK 152994B
- Authority
- DK
- Denmark
- Prior art keywords
- cup
- shaped recesses
- building element
- recesses
- bottom surfaces
- Prior art date
Links
- 239000011888 foil Substances 0.000 claims description 36
- 239000000463 material Substances 0.000 claims description 20
- 230000010355 oscillation Effects 0.000 claims description 14
- 239000004033 plastic Substances 0.000 claims description 13
- 229920003023 plastic Polymers 0.000 claims description 13
- 239000011521 glass Substances 0.000 claims description 9
- 238000004049 embossing Methods 0.000 claims description 8
- 239000013039 cover film Substances 0.000 claims description 6
- 239000002985 plastic film Substances 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 6
- 229920006255 plastic film Polymers 0.000 claims description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000011707 mineral Substances 0.000 claims description 3
- 230000000717 retained effect Effects 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 2
- 238000009826 distribution Methods 0.000 claims description 2
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 description 56
- 238000004080 punching Methods 0.000 description 12
- 239000010408 film Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005253 cladding Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000036651 mood Effects 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000003584 silencer Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
- E04B1/84—Sound-absorbing elements
- E04B1/86—Sound-absorbing elements slab-shaped
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
- E01F8/0005—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement
- E01F8/0035—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement with undulated surfaces
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
- E01F8/0005—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement
- E01F8/0047—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement with open cavities, e.g. for covering sunken roads
- E01F8/0076—Cellular, e.g. as wall facing
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
- E04B1/84—Sound-absorbing elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B2001/742—Use of special materials; Materials having special structures or shape
- E04B2001/748—Honeycomb materials
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
- E04B1/84—Sound-absorbing elements
- E04B2001/8414—Sound-absorbing elements with non-planar face, e.g. curved, egg-crate shaped
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
- E04B1/84—Sound-absorbing elements
- E04B2001/8423—Tray or frame type panels or blocks, with or without acoustical filling
- E04B2001/8442—Tray type elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
- E04B1/84—Sound-absorbing elements
- E04B2001/8457—Solid slabs or blocks
- E04B2001/8476—Solid slabs or blocks with acoustical cavities, with or without acoustical filling
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Acoustics & Sound (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Electromagnetism (AREA)
- Building Environments (AREA)
- Laminated Bodies (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19792921050 DE2921050A1 (de) | 1979-05-23 | 1979-05-23 | Schallabsorbierendes bauelement aus kunststoff-folie |
| DE2921050 | 1979-05-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DK218180A DK218180A (da) | 1980-11-24 |
| DK152994B true DK152994B (da) | 1988-06-06 |
Family
ID=6071582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK218180AA DK152994B (da) | 1979-05-23 | 1980-05-19 | Lydabsorberende bygningselement |
Country Status (16)
| Country | Link |
|---|---|
| US (1) | US4425981A (en, 2012) |
| AT (1) | ATA271380A (en, 2012) |
| BE (1) | BE883430A (en, 2012) |
| CH (1) | CH647575A5 (en, 2012) |
| DD (1) | DD150917A5 (en, 2012) |
| DE (1) | DE2921050A1 (en, 2012) |
| DK (1) | DK152994B (en, 2012) |
| ES (1) | ES491698A0 (en, 2012) |
| FR (1) | FR2457350A1 (en, 2012) |
| GB (1) | GB2053426B (en, 2012) |
| HU (1) | HU181128B (en, 2012) |
| IE (1) | IE49484B1 (en, 2012) |
| IT (1) | IT8022194A0 (en, 2012) |
| LU (1) | LU82475A1 (en, 2012) |
| NL (1) | NL8002918A (en, 2012) |
| SU (1) | SU1079183A3 (en, 2012) |
Families Citing this family (45)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3233654C2 (de) * | 1982-09-10 | 1986-01-16 | Ewald Dörken AG, 5804 Herdecke | Schallabsorbierendes Bauelement |
| DE3531886A1 (de) * | 1985-09-06 | 1987-03-19 | Stankiewicz Alois Dr Gmbh | Hohlkammern |
| DE3615360A1 (de) * | 1986-05-06 | 1987-11-12 | Stankiewicz Alois Dr Gmbh | Bauelement mit akustischen eigenschaften |
| US5268540A (en) * | 1991-10-24 | 1993-12-07 | Superior Precast, Inc. | Sound barrier absorption panel |
| BE1005752A3 (nl) * | 1992-03-24 | 1994-01-18 | Cuykx Hildegarde Juliana Eugen | Acoestische scherminrichting. |
| DE4237513A1 (de) * | 1992-11-07 | 1994-05-11 | Helmut Pelzer | Luftschall absorbierendes Formteil |
| DE4317828C1 (de) * | 1993-05-28 | 1994-06-09 | Freudenberg Carl Fa | Luftschall absorbierendes Formteil |
| DE4408782A1 (de) * | 1994-03-15 | 1995-09-21 | Fraunhofer Ges Forschung | Folien-Schallabsorber |
| DE4414566C2 (de) * | 1994-04-27 | 1997-11-20 | Freudenberg Carl Fa | Luftschalldämpfer |
| CA2197439C (en) * | 1994-08-12 | 2006-06-13 | Eduard Bruck | Sound absorber |
| US5665943A (en) * | 1995-06-15 | 1997-09-09 | Rpg Diffusor Systems, Inc. | Nestable sound absorbing foam with reduced area of attachment |
| SE506188C2 (sv) * | 1996-01-25 | 1997-11-17 | Dale Edward Knipstein | Ljudabsorberande element samt förfarande för framställning av detta element samt användning av elementet |
| DE29617845U1 (de) * | 1996-10-14 | 1998-02-12 | M. Faist GmbH & Co. KG, 86381 Krumbach | Einrichtung zum Absorbieren und/oder Dämpfen von Schallwellen |
| DE19652527A1 (de) * | 1996-12-17 | 1998-06-18 | Faist M Gmbh & Co Kg | Absorber zum Absorbieren akustischer Schallwellen |
| AT408552B (de) * | 1998-05-12 | 2002-01-25 | Brunbauer Wolfgang Dipl Ing | Schallschutzeinrichtung |
| US6053275A (en) * | 1998-07-21 | 2000-04-25 | Caterpillar Inc. | Acoustical absorber array |
| GB2345951A (en) * | 1999-01-19 | 2000-07-26 | Draftex Ind Ltd | Sound-absorbing structure |
| IT1316775B1 (it) * | 2000-02-18 | 2003-05-12 | Sergio Zambelli | Pannello prefabbricato in calcestruzzo per l'edilizia industrializzata ad elevato isolamento termico e/o acustico |
| USD482910S1 (en) | 2001-02-01 | 2003-12-02 | Joseph Jeup | Panel |
| FR2837508B1 (fr) * | 2002-03-19 | 2005-06-24 | Ecole Polytech | Mur antibruit |
| EP1693255A4 (en) * | 2003-11-19 | 2007-11-21 | Hayashi Engineering Inc | SHOCK ABSORBING BODY |
| US8617715B2 (en) * | 2003-12-06 | 2013-12-31 | Cpfilms Inc. | Fire retardant shades |
| DE502005007070D1 (de) * | 2004-06-17 | 2009-05-28 | Heimbach Gmbh & Co Kg | Schalldämmeinrichtung für einen Wand-, Decken- oder Bodenbelag |
| KR100571539B1 (ko) * | 2004-06-30 | 2006-04-24 | 김배영 | 흡음 블록 및 그 시공 방법 |
| US7520370B2 (en) * | 2006-05-17 | 2009-04-21 | William Orlin Gudim | Combination acoustic diffuser and absorber and method of production thereof |
| US20090181242A1 (en) * | 2008-01-11 | 2009-07-16 | Enniss James P | Exterior window film |
| WO2009130720A1 (en) * | 2008-04-22 | 2009-10-29 | Patt Spa | Modular sound insulation wall with panels |
| DE102008063923A1 (de) * | 2008-12-19 | 2010-06-24 | Airbus Deutschland Gmbh | Mehrschichtplatte zur Schalldämmung |
| RU2440626C1 (ru) * | 2010-06-17 | 2012-01-20 | Государственное Образовательное Учреждение Высшего Профессионального Образования "Амурский Государственный Университет" | Шумопоглощающая конструкция |
| WO2012006663A1 (en) * | 2010-07-13 | 2012-01-19 | Bellmax Acoustic Pty Ltd | An acoustic panel |
| US8999509B2 (en) | 2011-04-27 | 2015-04-07 | Cpfilms Inc. | Weather resistant exterior film composite |
| FI20115485A (fi) * | 2011-05-19 | 2012-11-20 | Yeseco Oy | Akustiikkalevy |
| CN103137118B (zh) | 2011-11-30 | 2016-07-06 | 香港科技大学 | 声能吸收超材料 |
| EP3112257B1 (en) | 2012-07-06 | 2018-01-24 | C&D Zodiac, Inc. | Aircraft interior panel with acoustic materials |
| DE102014218730A1 (de) * | 2014-09-18 | 2016-03-24 | Ford Global Technologies, Llc | Energieabsorber und Überkopfsystem mit Energieabsorber |
| US9630575B2 (en) * | 2015-09-30 | 2017-04-25 | GM Global Technology Operations LLC | Panel assembly with noise attenuation system |
| RU2626471C1 (ru) * | 2016-02-25 | 2017-07-28 | Олег Савельевич Кочетов | Звукопоглощающий элемент кочетова |
| KR102446926B1 (ko) * | 2017-10-24 | 2022-10-04 | 현대자동차주식회사 | 흡차음 복합판재 |
| USD863196S1 (en) * | 2017-11-14 | 2019-10-15 | Afshin Ariay | Machinery cover |
| US11421428B2 (en) * | 2018-07-05 | 2022-08-23 | Econcore N.V. | Floating floor system |
| US20220415297A1 (en) | 2019-11-22 | 2022-12-29 | Basf Se | Sound insulation device |
| USD945024S1 (en) * | 2020-09-15 | 2022-03-01 | Lightfront Corporation | Sound absorption panel |
| USD963206S1 (en) * | 2021-02-14 | 2022-09-06 | STP North America LLC | Sound deadening mat |
| JP7593203B2 (ja) * | 2021-03-31 | 2024-12-03 | マツダ株式会社 | 振動減衰構造 |
| CN114197668B (zh) * | 2021-12-29 | 2023-05-02 | 哈尔滨工程大学 | 一种周期性薄膜建筑吸隔声超结构 |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2153357A (en) | 1936-11-13 | 1939-04-04 | Bell Telephone Labor Inc | Acoustic damping material |
| US2320737A (en) * | 1939-06-22 | 1943-06-01 | Ruberoid Co | Sound damping insulation and process of manufacture |
| US2541159A (en) | 1946-01-22 | 1951-02-13 | Paul H Geiger | Sound deadener for vibratory bodies |
| US2671522A (en) | 1950-03-31 | 1954-03-09 | Bourgeois Charles | Sound-absorbing panel |
| US2710335A (en) | 1952-12-30 | 1955-06-07 | Cepco Inc | Light diffusing and sound absorbing unit |
| FR1094560A (fr) | 1953-11-26 | 1955-05-23 | Revêtement souple pour l'isolation acoustique et thermique | |
| US3035657A (en) | 1959-12-22 | 1962-05-22 | Sidney Roofing & Paper Company | Acoustic panel |
| FR1261426A (fr) | 1960-04-09 | 1961-05-19 | Panneau perfectionné | |
| DE1211370B (de) * | 1960-11-12 | 1966-02-24 | Fraunhofer Ges Forschung | Luftschalldaemmung dynamisch biegeweicher Schalen, wie Wandschalen, Unterdecken, Tueren, Schallabschirmmungen und Flaechenelement hierfuer |
| US3866001A (en) * | 1974-03-04 | 1975-02-11 | Junger Miguel C | Structural block with septum |
| US4228869A (en) | 1976-07-17 | 1980-10-21 | Messerschmitt-Bolkow-Blohm Gmbh | Variable volume resonators using the Belleville spring principle |
| DE2632290C3 (de) | 1976-07-17 | 1980-02-14 | Messerschmitt-Boelkow-Blohm Gmbh, 8000 Muenchen | Schallreduktion durch mitschwingende Resonatoren |
| DE2758041C2 (de) * | 1977-12-24 | 1985-10-31 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München | Verwendung eines aus mindestens zwei übereinander angeordneten Folien, insbesondere Kunststoffolien, bestehenden Bauelements |
-
1979
- 1979-05-23 DE DE19792921050 patent/DE2921050A1/de active Granted
-
1980
- 1980-05-19 DK DK218180AA patent/DK152994B/da not_active Application Discontinuation
- 1980-05-20 FR FR8011209A patent/FR2457350A1/fr active Granted
- 1980-05-20 IT IT8022194A patent/IT8022194A0/it unknown
- 1980-05-21 LU LU82475A patent/LU82475A1/de unknown
- 1980-05-21 HU HU80801274A patent/HU181128B/hu unknown
- 1980-05-21 ES ES491698A patent/ES491698A0/es active Granted
- 1980-05-21 GB GB8016836A patent/GB2053426B/en not_active Expired
- 1980-05-21 AT AT0271380A patent/ATA271380A/de not_active Application Discontinuation
- 1980-05-21 NL NL8002918A patent/NL8002918A/nl not_active Application Discontinuation
- 1980-05-22 CH CH4010/80A patent/CH647575A5/de not_active IP Right Cessation
- 1980-05-22 BE BE0/200718A patent/BE883430A/fr not_active IP Right Cessation
- 1980-05-22 SU SU802931097A patent/SU1079183A3/ru active
- 1980-05-22 DD DD80221318A patent/DD150917A5/de unknown
- 1980-05-23 IE IE1087/80A patent/IE49484B1/en unknown
-
1981
- 1981-11-17 US US06/322,275 patent/US4425981A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US4425981A (en) | 1984-01-17 |
| GB2053426A (en) | 1981-02-04 |
| CH647575A5 (de) | 1985-01-31 |
| LU82475A1 (de) | 1980-10-08 |
| DE2921050C2 (en, 2012) | 1987-12-17 |
| ES8101173A1 (es) | 1980-12-16 |
| IE801087L (en) | 1980-11-23 |
| IE49484B1 (en) | 1985-10-16 |
| FR2457350B1 (en, 2012) | 1983-12-09 |
| FR2457350A1 (fr) | 1980-12-19 |
| NL8002918A (nl) | 1980-11-25 |
| ATA271380A (de) | 1987-11-15 |
| DD150917A5 (de) | 1981-09-23 |
| DE2921050A1 (de) | 1980-11-27 |
| IT8022194A0 (it) | 1980-05-20 |
| SU1079183A3 (ru) | 1984-03-07 |
| ES491698A0 (es) | 1980-12-16 |
| BE883430A (fr) | 1980-09-15 |
| HU181128B (en) | 1983-06-28 |
| GB2053426B (en) | 1982-12-22 |
| DK218180A (da) | 1980-11-24 |
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