SE448575B - REFLECTOR CONSTRUCTION FOR IR OVENS - Google Patents
REFLECTOR CONSTRUCTION FOR IR OVENSInfo
- Publication number
- SE448575B SE448575B SE8304363A SE8304363A SE448575B SE 448575 B SE448575 B SE 448575B SE 8304363 A SE8304363 A SE 8304363A SE 8304363 A SE8304363 A SE 8304363A SE 448575 B SE448575 B SE 448575B
- Authority
- SE
- Sweden
- Prior art keywords
- reflector
- tubes
- oven
- construction
- objects
- Prior art date
Links
- 238000010276 construction Methods 0.000 title claims description 9
- 230000005855 radiation Effects 0.000 claims abstract description 7
- 239000000919 ceramic Substances 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 239000002657 fibrous material Substances 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims 1
- 239000000356 contaminant Substances 0.000 claims 1
- 238000009423 ventilation Methods 0.000 claims 1
- 239000012535 impurity Substances 0.000 abstract 1
- 238000004140 cleaning Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011094 fiberboard Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- GPRLSGONYQIRFK-MNYXATJNSA-N triton Chemical compound [3H+] GPRLSGONYQIRFK-MNYXATJNSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0006—Electric heating elements or system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/22—Reflectors for radiation heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
- F26B3/30—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infrared-emitting elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/36—Arrangements of heating devices
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Microbiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Tunnel Furnaces (AREA)
- Control Of High-Frequency Heating Circuits (AREA)
- Electric Ovens (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Control Of Resistance Heating (AREA)
- Electric Stoves And Ranges (AREA)
Abstract
Description
05 10 20 25 30 35 POOR QUALITY M' 2 448 575 med konventionella metoder och åtminstone ej med reflektorytan på plats i ugnen. Den hittills vanliga metoden för att efter en tids drift av ugnen åter höja dess verkningsgrad är därför att ugnen avställes. varpå de förorenade sektionerna ned» monteras och utbytes mot nya reflektorytor. Eftersom det i synnerhet är de närmast IR-rören belägna reflektorytorna, d.v.s i praktiken ytorna bakom IR-rören, som utsättes för fór- orening är detta ett tidkrávande arbete då även IR-rören måste demonteras for att möjliggöra utbyte av sådana reflektorytor. 05 10 20 25 30 35 POOR QUALITY M '2 448 575 with conventional methods and at least not with the reflector surface in place in the oven. The hitherto common method of raising its efficiency again after a period of operation of the furnace is therefore that the furnace is shut down. whereupon the contaminated sections are »dismantled» and replaced with new reflector surfaces. Since it is in particular the reflector surfaces located closest to the IR tubes, i.e. in practice the surfaces behind the IR tubes, which are exposed to contamination, this is a time-consuming work as the IR tubes must also be dismantled to enable replacement of such reflector surfaces.
Detta innebär forutom arbetet att ugnen måste tas ur bruk för en viss tid relativt ofta. vilket naturligtvis starkt påverkar dess möjliga utnyttjandegrad. ggpfinningens ändamål och viktigaste kännetecken Ändamålet med uppfinningen är att erbjuda en reflektor- konstruktion för IR-ugnar av inledningsvis beskrivet slag. som medför att reflektorytor utsattes för en kon- blir vilket garanterar ett jämnt varme- ugnskammarens tinuerlig rengöring, varigenom IR-ugnens verkningsgrad hög och framför allt jämn, behandlingsresultat, reflek- de- och detta har uppnåtts genom att torkonstruktionen givits de i bifogade patentkrav 1 finierade sârdragen. fleskrivnind av ritninqarna Uppfinningen kommer i det följande att närmare beskrivas under hänvisning till i bifogade ritningar visade utföringsexempel.In addition to the work, this means that the oven must be taken out of service for a certain period of time relatively often. which, of course, strongly affects its potential utilization rate. The object and most important features of the invention are The object of the invention is to offer a reflector construction for IR furnaces of the type initially described. which means that the reflector surfaces are exposed to a cone, which guarantees an even cleaning of the heating furnace chamber, whereby the efficiency of the IR furnace is high and above all even, treatment results, reflectance and this has been achieved by giving the dryer construction the claims in appended claim 1. veneered features. DESCRIPTION OF THE DRAWINGS The invention will be described in more detail below with reference to exemplary embodiments shown in the accompanying drawings.
Figur 1 visar i tvärsnitt en reflektorkonstruktion enligt upp- finningen omfattande en reflektorskiva och därpå monterade IR-rör.Figure 1 shows in cross section a reflector construction according to the invention comprising a reflector plate and IR tubes mounted thereon.
Figur 2 är ett motsvarande tvärsnitt genom en som en kassett utformad kombination IR-rör/reflektor. ' Figur 3 visar en planvy av kassetten enligt figur 2, och Figur k slutligen visar i en ändvy en IR-ugn utrustad med reflektorkonstruktionen enligt uppfinningen. 05 10 15 20 25 30 35 448 575 Figur 1 visar i tvärsnitt en reflektorskiva 1 Försedd med hållare 2 for ett antal IR-rör 3, av godtycklig typ.Figure 2 is a corresponding cross-section through an IR tube / reflector combination designed as a cassette. Figure 3 shows a plan view of the cassette according to Figure 2, and Figure k finally shows in an end view an IR oven equipped with the reflector construction according to the invention. 05 10 15 20 25 30 35 448 575 Figure 1 shows in cross section a reflector disc 1 Equipped with holder 2 for a number of IR tubes 3, of any type.
Reflektorskivan 1 utgöres av en självbärande keramisk fiber- platta, företrädesvis baserad på aluminiumoxid och som har den egenskapen att den reflekterar bort större delen av strål- ningen medan en mindre del absorberas av reflektormaterialets reflektorytan stiger därmed snabbt till bort yta. Temperaturen i höga vården, varigenom organiska föroreningar brännas från reflektorytan, och härmed har man åstadkommit en själv- rengörande reflektor 1.The reflector plate 1 consists of a self-supporting ceramic fiber plate, preferably based on alumina and which has the property that it reflects off most of the radiation while a smaller part is absorbed by the reflector surface of the reflector material thus rising rapidly to the away surface. The temperature in high care, whereby organic pollutants are burned from the reflector surface, and thus a self-cleaning reflector 1 has been achieved.
En sådan keramisk fiberplatta som marknadsföres under handels- namnet TRITON KAOWOOL, såsom en isolerplatta. har överraskande visat sig ge den önskade effekten som en självrenande reflektorskiva, varvid den samtidigt har en mot sin från reflektorn vända sida isolerande verkan.Such a ceramic fiberboard marketed under the trade name TRITON KAOWOOL, as an insulating board. has surprisingly been found to give the desired effect as a self-cleaning reflector disc, at the same time having an insulating effect facing its side facing the reflector.
Materialet som innehåller 43 - 47 Z Al 0 och 57-53% S10 . har förmåga att motstå temperaturer upp tšlš 14U0°C, d.v.s.2 tem- peraturer som är väl tillräckliga för att föroreningar i form av damm, färgstänk och fett, skall förbrännas. Reflektorskivan 1 av detta material reflekterar ca 851 av IR-strålningen medan ca 151 att hålla reflektorn andra absorberas och därmed användes fór ren. Det är underförstått att även likvärdiga material kan komma till användning.The material containing 43 - 47 Z Al 0 and 57-53% S10. has the ability to withstand temperatures up to 14U0 ° C, i.e. 2 temperatures that are well enough to burn pollutants in the form of dust, splashes and grease. The reflector disk 1 of this material reflects about 851 of the IR radiation while about 151 to hold the reflector second is absorbed and thus used for cleaning. It is understood that equivalent materials may also be used.
Figur 2 visar i tvärsnitt motsvarande figur 1, en som en kassett utformad enhet 4 omfattande isolerande reflektorskiva 1 med från dess ena flatsidoyta utgående hållare 2 som uppbär IR-rör 3, medan på skivans motsatta sida är ett plâthus. kan innehålla en ej anbragt bestående av en plâtram 5 och en täckplåt 6. Huset visad inblåsningsfläkt och är för detta ändamål försett med en anslutningsstos T.Figure 2 shows in cross section corresponding to figure 1, a unit 4 formed as a cassette comprising insulating reflector disc 1 with holder 2 emanating from one flat side surface which carries IR tubes 3, while on the opposite side of the disc is a plate housing. may contain an unassembly consisting of a plate frame 5 and a cover plate 6. The housing shown blowing fan and is for this purpose provided with a connection socket T.
Av figur 3, som visar kassetten enligt figur 2 i planvy från 05 10 15 20 25 30 35 448 š75 den med IR-rören 3 försedda sidan framgår hur hållarna 2. som uppbär IR-rören är placerade en i närheten av vardera IR-röra ände. Kassetten är också försedd med monteringshål 8 för enhetens montering i en IR-ugn. Vid varje ändanslutning för IR-rören finns perforeringar 9, avsedda att tillföra kylluft till dessa anslutningar från plåthuset. reflektorskivan enligt figur 1 kan anpassas Den självbarande efter aktuella behov och monteras in i befintliga ugnskammrar utan att förändra det befintliga ugnsskalet i nämnvärd om- fattning. ' Med kassetten enligt figurerna 2 och 3 kan man utföra montage till en ugnskammare av godtycklig utformning, och om varken den i visade utformningen till figur 1 eller den i figurerna 2,3 är lämplig kan kombinationen IR-rör/reflektor anpassas vilken ugnstyp som helst.Figure 3, which shows the cassette according to Figure 2 in plan view from the side provided with the IR tubes 3, shows how the holders 2. which support the IR tubes are placed in the vicinity of each IR tube. End. The cassette is also provided with mounting holes 8 for mounting the unit in an IR oven. At each end connection for the IR pipes there are perforations 9, intended to supply cooling air to these connections from the sheet metal housing. the reflector plate according to figure 1 can be adapted to the self-supporting according to current needs and installed in existing oven chambers without changing the existing oven shell to any appreciable extent. With the cassette according to Figures 2 and 3, assembly can be performed to an oven chamber of any design, and if neither the one shown in the design shown in Figure 1 nor the one in Figures 2,3 is suitable, the IR tube / reflector combination can be adapted to any type of oven. .
I figur 4 visas som ett exempel sålunda an applikation av upp- finningen vid en pulverhärdningsugn för smältning och hårdning av på föremål t.ex. på elektrostatisk väg påförda plastskikt.Figure 4 thus shows as an example an application of the invention to a powder hardening furnace for melting and hardening of objects e.g. electrostatically applied plastic layers.
IR-ugnen omfattar bl.a. en ugnskammare i två, längs en i ugnens lángsriktning anordnad axel ledbart förenade halvor 10, 11. vardera ansluten till ställdon 12 med vars hjälp ugnen kan Alternativt kan öppnas så som antydes med streckade linjer. ugnen vara försedd med sidohängda. öppningsbara dörrar.The IR oven includes i.a. a furnace chamber in two halves 10, 11 arranged along an axis arranged in the longitudinal direction of the furnace, each connected to actuators 12 by means of which the furnace can alternatively be opened as indicated by dashed lines. the oven be fitted with side hangers. openable doors.
I stängt (heldragna linjer) bildar de två ugnshalvorna skall be- transporteras. Ugnsutrymmet 13 är försett med en inre läge 10,11 ett ugnsutrymme 13 genom vilket föremål. som handlas vägginneslutning. som i ugnens lutande tak- och bottenregioner 14 resp. 15 uppvisar genomgångar eller perforeringar. Ugns- kammarens inre, vertikala väggar 16 har däremot inga per- foreringar, men är på sina inåt ugnskammaren vända väggar ut- antal IR-lampor 17. 14, formade som reflektorer. som uppbär ett lutande tak- ligtvis vara utformade som reflektorer. Reflektorytorna 16 är det Även de och bottenpartierna 15 kan natur- utformade på sätt som beskrivits ovan i anslutning till 05 10 15 20 25 (F 448 575 figurerna 1,2 och 3. Även ytorna 14. 15 kan om de är utformade som reflektorer vara tillverkade av keramiskt fibermaterial, men den självrenande effekten kan knappast erhållas på dessa ytor eftersom ett krav är att reflektorn ligger relativt nära IR~lampan för att uppnå tillräckligt hög temperatur.In closed (solid lines) form the two oven halves to be transported. The oven space 13 is provided with an inner position 10,11, an oven space 13 through which object. traded wall enclosure. as in the inclined roof and bottom regions of the oven 14 resp. 15 have passages or perforations. The inner, vertical walls 16 of the furnace chamber, on the other hand, have no perforations, but are on their walls facing the inward furnace chamber a number of IR lamps 17. 14, shaped as reflectors. which support a sloping roof should be designed as reflectors. The reflector surfaces 16 are also The and the bottom portions 15 can be natural-shaped in the manner described above in connection with made of ceramic fiber material, but the self-cleaning effect can hardly be obtained on these surfaces because a requirement is that the reflector is relatively close to the IR lamp to achieve a sufficiently high temperature.
I taket till resp. ugnshalva är anordnade radialfläktarna 19 för cirkulation av ugnsluften genom perforeringarna i ugnens innertak 1L och via kanaler 18 mellan reflektorerna 16 och den yttre isolerade, vertikala ugnsväggen till botten av ugnen, där luften åter ledes in i ugnskammaren genom perforeringarna i bottenregionen 15.In the ceiling to resp. half of the furnace, the radial fans 19 are arranged for circulating the furnace air through the perforations in the furnace ceiling 1L and via channels 18 between the reflectors 16 and the outer insulated vertical furnace wall to the bottom of the furnace, where the air is led back into the furnace chamber through the perforations in the bottom region 15.
Ugnskammarens tvärsnitt är utfört i hexagonform. och endast de vertikala väggarna används som bärare av IR-lampor. för att dessa ej skall skadas av nedfallande föremål. IR-lamporna kan alternativt vara separat monterade på en från väggarna 15 fri- stående bärkonstruktion. men dock i anslutning till dessa väggar.The cross section of the oven chamber is made in hexagonal shape. and only the vertical walls are used as carriers of IR lamps. so that these are not damaged by falling objects. The IR lamps can alternatively be mounted separately on a support structure independent of the walls 15. but nevertheless in connection with these walls.
IR-ugnen kan emellertid ha vilken lämplig utformning som helst och kan vara anpassad för hängande gods eller plangods. uppfinningen är ej begränsad till i bifogade ritningar visade och i anslutning därtill beskrivna utföranden utan modifi- kationer är möjliga inom ramen för efterföljande patentkrav.However, the IR oven can have any suitable design and can be adapted for hanging goods or flat goods. the invention is not limited to embodiments shown in the accompanying drawings and described in connection therewith, without modifications being possible within the scope of the appended claims.
Claims (5)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE8304363A SE448575B (en) | 1983-08-11 | 1983-08-11 | REFLECTOR CONSTRUCTION FOR IR OVENS |
| EP84850241A EP0133847B1 (en) | 1983-08-11 | 1984-08-13 | A reflector structure for infrared radiation ovens |
| DE8484850241T DE3471154D1 (en) | 1983-08-11 | 1984-08-13 | A reflector structure for infrared radiation ovens |
| AT84850241T ATE34212T1 (en) | 1983-08-11 | 1984-08-13 | REFLECTOR FOR INFRARED RADIANT OVEN. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE8304363A SE448575B (en) | 1983-08-11 | 1983-08-11 | REFLECTOR CONSTRUCTION FOR IR OVENS |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| SE8304363D0 SE8304363D0 (en) | 1983-08-11 |
| SE8304363L SE8304363L (en) | 1985-02-12 |
| SE448575B true SE448575B (en) | 1987-03-02 |
Family
ID=20352168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE8304363A SE448575B (en) | 1983-08-11 | 1983-08-11 | REFLECTOR CONSTRUCTION FOR IR OVENS |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0133847B1 (en) |
| AT (1) | ATE34212T1 (en) |
| DE (1) | DE3471154D1 (en) |
| SE (1) | SE448575B (en) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0271593A1 (en) * | 1986-12-16 | 1988-06-22 | Russell R. Ellersick | Furnace wall lining composition and the use thereof |
| US5099586A (en) * | 1989-09-08 | 1992-03-31 | W. R. Grace & Co.-Conn. | Reflector assembly for heating a substrate |
| US5551670A (en) * | 1990-10-16 | 1996-09-03 | Bgk Finishing Systems, Inc. | High intensity infrared heat treating apparatus |
| DE4202944C2 (en) * | 1992-02-01 | 1994-07-14 | Heraeus Quarzglas | Method and device for heating a material |
| GB9219221D0 (en) * | 1992-09-11 | 1992-10-28 | Queen Mary & Westfield College | Furnace |
| IT1283311B1 (en) * | 1996-03-27 | 1998-04-16 | Nichilo Giorgio De | OVEN PARTICULARLY FOR HEATING STATIONS IN THERMOFORMING MACHINES AND HEATING STATION EQUIPPED WITH THIS OVEN |
| SE507148C2 (en) * | 1996-08-30 | 1998-04-06 | Infraroedteknik Ab | Heating device heating with infrared radiation |
| SE513409C2 (en) | 1997-07-01 | 2000-09-11 | Kanthal Ab | IR source consisting of a high temperature helical element, which is placed in an open reflector |
| WO2000056675A1 (en) | 1999-03-23 | 2000-09-28 | Schott Glas | Method and device for the homogeneous heating of glass and/or glass-ceramic articles using infrared radiation |
| AU3557400A (en) | 1999-03-23 | 2000-10-09 | Fotheringham, Ulrich | Method of forming glass-ceramic parts and/or glass parts |
| DE10029522B4 (en) * | 2000-06-21 | 2005-12-01 | Schott Ag | Apparatus for the homogeneous heating of glasses and / or glass-ceramics, methods and uses |
| DE10047576A1 (en) * | 2000-09-22 | 2002-04-18 | Schott Glas | Production of glass ceramic parts and/or glass parts comprises deforming a glass ceramic blank and/or a glass blank using IR radiation |
| US6288369B1 (en) * | 2000-12-15 | 2001-09-11 | Victor L. Sherman | Cooking apparatus |
| DE10118260A1 (en) * | 2001-04-11 | 2002-10-24 | Schott Glas | Process for deforming bodies made from glass or glass-ceramic comprises placing the body on a mold, and heating using short wave infrared radiation |
| US7115837B2 (en) * | 2003-07-28 | 2006-10-03 | Mattson Technology, Inc. | Selective reflectivity process chamber with customized wavelength response and method |
| DE102005000837B4 (en) | 2005-01-05 | 2022-03-31 | Advanced Photonics Technologies Ag | Thermal irradiation arrangement for heating an item to be irradiated |
| DE102006055397B3 (en) * | 2006-11-22 | 2008-05-15 | Heraeus Quarzglas Gmbh & Co. Kg | Method and device for the production of a cylindrical profile element made of quartz glass and use thereof |
| DE102011012363A1 (en) | 2011-02-24 | 2012-08-30 | Heraeus Noblelight Gmbh | Infrared surface radiator for infrared radiation with high radiating power per unit area, has pipes whose outer surfaces are provided on side with reflector and fixation layer made of opaque quartz glass, where side faces toward surface |
| DE102014107395A1 (en) * | 2014-05-26 | 2015-11-26 | Sandvik Materials Technology Deutschland Gmbh | Device for mounting radiant heating elements and corresponding radiant heater |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR398210A (en) * | 1908-12-31 | 1909-05-29 | Martin Brandt | Rapid heater |
| DE2840339A1 (en) * | 1978-09-15 | 1980-04-03 | Bartholomaeus & Rudolph Gmbh & | Continuous drier for photographic materials - has infrared heater bars with internally reflective quartz cladding and cooling fan |
-
1983
- 1983-08-11 SE SE8304363A patent/SE448575B/en not_active IP Right Cessation
-
1984
- 1984-08-13 AT AT84850241T patent/ATE34212T1/en not_active IP Right Cessation
- 1984-08-13 DE DE8484850241T patent/DE3471154D1/en not_active Expired
- 1984-08-13 EP EP84850241A patent/EP0133847B1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| EP0133847A3 (en) | 1986-12-30 |
| EP0133847A2 (en) | 1985-03-06 |
| EP0133847B1 (en) | 1988-05-11 |
| DE3471154D1 (en) | 1988-06-16 |
| SE8304363D0 (en) | 1983-08-11 |
| ATE34212T1 (en) | 1988-05-15 |
| SE8304363L (en) | 1985-02-12 |
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