DK158287B - DEVICE FOR CONTINUOUS COOLING OF HOT-ROLLED BAR MATERIAL - Google Patents

DEVICE FOR CONTINUOUS COOLING OF HOT-ROLLED BAR MATERIAL Download PDF

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Publication number
DK158287B
DK158287B DK082279A DK82279A DK158287B DK 158287 B DK158287 B DK 158287B DK 082279 A DK082279 A DK 082279A DK 82279 A DK82279 A DK 82279A DK 158287 B DK158287 B DK 158287B
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DK
Denmark
Prior art keywords
water
channel
slots
rod material
blanket
Prior art date
Application number
DK082279A
Other languages
Danish (da)
Other versions
DK158287C (en
DK82279A (en
Inventor
Jacobus Anthonius Dekkers
Barend Van Der Nulft
Original Assignee
Estel Hoogovems Bv
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 Estel Hoogovems Bv filed Critical Estel Hoogovems Bv
Publication of DK82279A publication Critical patent/DK82279A/en
Publication of DK158287B publication Critical patent/DK158287B/en
Application granted granted Critical
Publication of DK158287C publication Critical patent/DK158287C/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0224—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for wire, rods, rounds, bars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/04—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in flat form, e.g. fan-like, sheet-like
    • B05B1/044—Slits, i.e. narrow openings defined by two straight and parallel lips; Elongated outlets for producing very wide discharges, e.g. fluid curtains

Description

iin

DK 158287 BDK 158287 B

Den foreliggende opfindelse angår et apparat til kontinuerlig køling af varmvalset stangmateriale, navnlig af stål, i hvilket stangmaterialet føres på langs gennem en vandmasse, der holdes i en kanal, der har 5 rektangulært lodret tværsnit, hvilken kanal er forsynet med et antal vandtilførselsåbninger i de lodrette sidevægge og har et aftageligt dæksel, hvorhos der i nærheden af hver ende af den nævnte vandmasse findes i hvert fald én højtryksdyse til tilvejebringelse af et nedad 10 rettet vandtæppe, der virker til at tilbageholde og begrænse vandmassen ved den pågældende ende, og ved bunden af kanalen er indrettet vandudløbsslidser, som strækker sig over hele kanalens bredde og er indrettet til modtagelse af vandtæpperne, og et antal vandudløbsslidser er 15 indrettet mellem vandtæpperne ved stangmaterialets udgangsende.The present invention relates to an apparatus for continuous cooling of hot rolled rod material, in particular steel, in which the rod material is passed longitudinally through a body of water held in a channel having 5 rectangular vertical cross-sections, which channel is provided with a plurality of water supply openings in the vertical sidewalls and having a removable cover wherein at least one high-pressure nozzle is provided near each end of said body of water to provide a downwardly directed blanket which acts to retain and limit the body of water at that end, and at the bottom of the channel are water outlet slots which extend over the entire width of the channel and are arranged to receive the water blankets, and a number of water outlet slots are arranged between the water blankets at the outlet end of the rod material.

I beskrivelsen og det tilknyttede krav anvendes udtrykket stangmateriale til alt langstrakt materiale, såvel stavformet som tyndere stangformet 20 og trådformet materiale, idet opfindelsen principielt kan anvendes til køling af alle sådanne former for langstrakt materiale.In the specification and the appended claim, the term rod material is used for all elongated material, both rod-shaped and thinner rod-shaped 20 and thread-shaped material, the invention being able in principle to be used for cooling all such forms of elongated material.

Et apparat eller anlæg af denne art er f.eks. beskrevet i dansk fremlæggelsesskrift nr. 139.143 ud-25 stedt på basis af dansk patentansøgning nr. 3010/74.An apparatus or plant of this kind is e.g. described in Danish Patent Application No. 139,143 issued on the basis of Danish Patent Application No. 3010/74.

I det dér beskrevne anlæg anvendes der såkaldte fiske-haledyser som højtryksdyser, idet denne betegnelse stammer fra formen af det dannede vandtæppe. Med denne dysetype vil vandtæppet imidlertid ikke række over hele 30 bredden af kanalen i dennes øverste parti nær ved dækslet, hvilket f.eks. kan ses af fig. 3 i det nævnte fremlæggelsesskrift. Desuden findes kraften i et således frembragt vandtæppe at kunne være utilstrækkelig til at holde på vandmassen i hvert fald under visse 35 driftsbetingelser. En hurtigt løbende stang vil derfor medrive en ikke ringe mængde af kølevandet, hvilketIn the plant described there, so-called fish-tail nozzles are used as high-pressure nozzles, this term originating from the shape of the formed carpet. However, with this nozzle type, the blanket will not reach over the full width of the channel in its upper portion near the cover, which e.g. can be seen from FIG. 3 of said disclosure. In addition, the power of a water rug thus produced may be found to be insufficient to hold the body of water at least under certain operating conditions. A fast-running rod will therefore attract a small amount of cooling water, which

DK 158287 BDK 158287 B

2 resulterer i uhomogen køling, samtidig med at det medrevne vand bringer de infrarød-følsomme fotoceller, der anvendes til overvågning af stangmaterialets position og derved til styring af hele køleanlægget, til 5 at afgive fejlagtige signaler.2 results in inhomogeneous cooling, at the same time as the entrained water causes the infrared-sensitive photocells used to monitor the position of the rod material and thereby to control the entire cooling system to 5 give erroneous signals.

Britisk patent nr. 1 514 460 og det tilsvarende tyske offentliggørelsesskrift nr. 2 539 422 viser et kølesystem, som har tre enheder til køling af et varmt stangmateriale. I dette dokument er det klart, at vandet 10 strømmer hovedsageligt fra sidevæggene mod stangmate-rialt og dette foregår gennem lodrette slidser. Disse har en indbyrdes afstand langs hver af karrets sider.British Patent No. 1,514,460 and corresponding German Patent Specification No. 2 539 422 disclose a cooling system having three units for cooling a hot rod material. In this document it is clear that the water 10 flows mainly from the sidewalls towards the rod material and this takes place through vertical slots. These are spaced apart along each of the sides of the tub.

Ved enden af hvert kar er imidlertid tilvejebragt et vandgardin ved hjælp af slidser, som er rettet mod 15 stangmaterialets bevægelsesretning.However, at the end of each vessel is provided a water curtain by means of slots directed to the direction of movement of the rod material.

Karret har et aftageligt dæksel.The tub has a removable cover.

I dette kendte britiske patentskrift nr. 1 514 460 fører dysen ikke vandet i en modstående slids, men mod det modstående vandtæppe. Dette medfører at en mængde 20 vand føres med af det fremførte stangmateriale.In this known British Patent Specification No. 1,514,460, the nozzle does not carry the water in an opposing slot, but against the opposing carpet. This results in an amount of 20 water being carried by the rod material conveyed.

Den foreliggende opfindelse tager sigte på at forbedre et apparat af den angivne art i disse henseender.The present invention aims to improve an apparatus of the kind specified in these respects.

Apparatet ifølge opfindelsen er ejendommeligt 25 ved, at kanalens dæksel er delt i mindst fire sektioner, der er adskilt ved mindst tre slidser, der strækker sig over kanalens hele bredde, hvorhos de af dyser tilvejebragte vandtæpper gennem disse slidser virker over kanalens fulde bredde, at den centrale dækselsektion belig-30 gende over vandmassen mellem den sidste slids ved kanalens indgangsende for stangmaterialet og den første slids ved udgangsenden har et antal åbninger til opadgående udslipning af luft eller vand fra kanalen, og at kanalen strækker sig udenfor den sidste højtryksdyse, idet der i 35 bunden af denne forlængede del er indrettet et antal vandudløbsslidser.The apparatus according to the invention is peculiar in that the cover of the duct is divided into at least four sections, separated by at least three slits extending over the entire width of the duct, where the nozzles provided by these nozzles act over the full width of the duct. the central cover section located above the body of water between the last slot at the channel end entrance of the rod material and the first slot at the outlet end has a plurality of openings for venting air or water from the channel, and the channel extends beyond the last high pressure nozzle; a plurality of water outlet slots are arranged at the bottom of this extended portion.

DK 158287 BDK 158287 B

33

Som resultat af disse ejendommeligheder ved opfindelsen bliver kølingen mere homogeiv samtidig med at det kølede stangmateriale, der afføles af de hertil tjenende følere, viser sig at være hovedsagelig fri 5 for kølevand.As a result of these peculiarities of the invention, the cooling becomes more homogeneous while the cooled rod material sensed by the sensors thereof is found to be essentially free of cooling water.

En udførelsesform for apparatet ifølge opfindelsen vil blive beskrevet i det følgende under henvisning til tegningen, på hvilken fig. 1 viser et lodret længdesnit gennem et 10 køleapparat ifølge opfindelsen, fig. 2 i større målestok et tværsnit gennem en dyse i det i fig. 1 viste apparat, og fig. 3 et tværsnit efter linien III-III i fig.An embodiment of the apparatus according to the invention will be described below with reference to the drawing, in which 1 is a vertical longitudinal section through a refrigeration apparatus according to the invention; FIG. 2 is an enlarged cross-sectional view through a nozzle of FIG. 1, and FIG. 3 is a cross-sectional view taken along line III-III of FIG.

1.First

15 Som vist i fig. 1 bevæger det varmvalsede stangmateriale sig fra venstre mod højre gennem køleappa-ratet. Det viste apparat består af en tragt i form af en kanal 1, hvis lodrette tværsnit er rektangulært som vist i fig. 3. I begge de lodrette sidevægge 2 og 20 3 findes der vandtilførselshuller i omtrent den halve højde, gennem hvilke huller der tilvejebringes en vandmasse 10 i kanalen 1 ved hjælp af ikke viste tilførselsrør. Kanalens aftagelige dæksel er delt i tilsammen fire sektioner 6, 7, 8, 9, der er adskilt 25 fra hinanden ved tre slidser henholdsvis 11, 12 og 13, der strækker sig over hele bredden af kanalen 1.15 As shown in FIG. 1, the hot-rolled rod material moves from left to right through the cooling apparatus. The apparatus shown consists of a funnel in the form of a channel 1 whose vertical cross-section is rectangular as shown in FIG. 3. In both the vertical side walls 2 and 20 3 there are water supply holes at about half the height through which holes a water mass 10 is formed in the channel 1 by means of supply pipes not shown. The removable cover of the duct is divided into a total of four sections 6, 7, 8, 9 which are separated 25 from each other by three slots 11, 12 and 13, respectively, extending over the entire width of the duct 1.

Oven over disse slidser 11, 12 og 13 findes der trykdyser henholdsvis 14, 15 og 16.Above these slots 11, 12 and 13 there are pressure nozzles 14, 15 and 16 respectively.

Som vist i fig. 1 er dyserne 14,15 og 16 30 indrettet til at tilvejebringe lodrette vandtæpper henholdsvis 17, 18 og 19. I denne udførelsesform fin des der kun én dyse 14 ved stangmaterialets indgangsende, medens der ved udgangsenden af kanalen 1 findes to dyser 15 og 16. Over for og neden under hver 35 dyse findes der. en vandudstr#mingsslids henholdsvis 21, 22 og 23 i kanalens bund 20.As shown in FIG. 1, the nozzles 14,15 and 16 30 are arranged to provide vertical water rugs 17, 18 and 19. In this embodiment, only one nozzle 14 is found at the entrance end of the rod material, while at the outlet end of the channel 1 two nozzles 15 and 16 are found. Above and below each 35 nozzle there are. a water flow slot 21, 22 and 23, respectively, in the bottom 20 of the channel.

44

DK 158287 BDK 158287 B

Mellem udstrømningsslidserne 22 og 23 ved kanalens udgangsende findes der en eller flere slidser 24. Kanalen 21 strækker sig i gennemførings-retningen forbi den sidste trykdyse 16 og i bunden 5 af denne forlængelse 25 findes der fire vandudstrømningsslidser 26, der alle strækker sig over kanalens fulde bredde. Inden den første dyse 14 findes der en udstrømningsslids 27. Set i tværsnit som i fig.Between the outlet slots 22 and 23 at the outlet end of the duct there are one or more slots 24. The duct 21 extends in the direction of passage past the last pressure nozzle 16 and at the bottom 5 of this extension 25 there are four water outlet slots 26, all extending over the full duct width. Prior to the first nozzle 14, an outflow slot 27. A cross-sectional view as in FIG.

1 har slidserne 21, 22, 23, 24, 26 og 27 i for- 10 hold til stangmaterialets bevægelsesretning en såkaldt ikke-fangende udformning, som gør, at stangmaterialet ikke kan fanges af en slids. En foretrukket udførelsesform for en sådan slids har en forkant, der er hovedsagelig lodret og en bagkant, der hælder bagud fra slid-15 sen under en vinkel på f.eks. 30° med vandret.1, the slots 21, 22, 23, 24, 26 and 27 in relation to the direction of movement of the rod material have a so-called non-catching configuration which prevents the rod material from being caught by a slot. A preferred embodiment of such a slot has a leading edge which is substantially vertical and a trailing edge inclined backward from the wear at an angle of e.g. 30 ° with horizontal.

Fig. 2 viser en af de tre dyser 14, 15 el ler 16 i tværsnit i større målestok. Denne dyse, der er betegnet med 14 i fig. 2, består af et forbindelsesrør 30, en rektangulær fordelerkasse 31, der forneden 20 er begrænset af en bund 32, i hvilken der passer et par plader 33 af L-formet tværsnit og fastgjort til bunden 32 ved hjælp af bolte 34. Hele dysen ^ 14 er ved hjælp af bolte 35 fastgjort til de to dækselsektioner 6 og 7, der tilsammen afgrænser slidsen 11. Imellem 25 pladerne 33 findes der en slids 36 med parallelle sider, der er snævrere end slidsen 11 og tjener til at tilvejebringe et vandtæppe 17, der strækker sig over hele bredden af kanalen 1.FIG. 2 shows one of the three nozzles 14, 15 or 16 in cross-section on a larger scale. This nozzle, designated 14 in FIG. 2, consists of a connecting tube 30, a rectangular distributor box 31, which is lowered 20 by a bottom 32 in which fits a pair of plates 33 of L-shaped cross-section and attached to the bottom 32 by bolts 34. The entire nozzle ^ 14 is secured by means of bolts 35 to the two cover sections 6 and 7 which together define the slot 11. Between 25 the plates 33 there is a slot 36 with parallel sides narrower than the slot 11 and serves to provide a water rug 17, extending over the entire width of the channel 1.

Det statiske tryk af vandet i kammeret 31 5 2 30 er ca. 7x10 N/m , hvilket bibringer tæppet tilstrækkelig kraft til fuldstændig at tilbageholde vandmassen i kanalen 1, selv om stangmaterialet løber meget hurtigt igennem kanalen. Den af hver tæppedyse udsendte vandmængde pr. tidsenhed er ca. fem gange så stor som i det 35 ovenfor omtalte kendte anlæg.The static pressure of the water in the chamber 31 5 2 30 is approx. 7x10 N / m, which provides the carpet with sufficient force to completely retain the water mass in the channel 1, although the rod material runs through the channel very quickly. The amount of water emitted by each blanket nozzle per time unit is approx. five times the size of the known plant mentioned above.

Claims (1)

DK 158287 B Som det fremgår af fig. 3, strækker vand" tæppet 17 sig over den fulde bredde af kanalen 1. Tæppet forlader kanalen gennem den åbning, som udgøres af slidsen 21 i kanalens bund 20. En ikke vist samle-5 rende under bunden 20 opfanger det vand, der kommer ud gennem de forskellige åbninger. De førende kanter af sektionerne 6, 7, 8 og 9 i køleapparatets aftage lige dasksel er alle formet, så at det løbende stangmateriale ikke kan fanges i nogen af slidserne 11, 12 og 10 13 eller imellem disse. Som det fremgår af fig. 1 har den centrale sektion 7 af kanalen 1' s dasksel, dvs. sektionen imellem vandtæppet 17 ved stangmaterialets indgangsende og det første tæppe 18 ved udgangsenden, et antal åbnin-15 ger 7a. Disse åbninger 7a muliggør hurtig udslipning af vand, f.eks. i tilfælde af, at en stang med en deformeret, f.eks. bukket, forreste ende træder ind i vandmassen. På denne måde undgås forstyrrelser af vandmassen, som kunne bringe dennes stabilitet i fare. 20 Apparat til kontinuerlig køling af varmvalset stangmateriale, navnlig af stål, i hvilket stangmaterialet føres på langs gennem en vandmasse, der holdes i en 25 kanal, der har rektangulært lodret tværsnit, hvilken kanal er forsynet med et antal vandtilførselsåbninger i de lodrette sidevægge og har et aftageligt dæksel, hvorhos der i nærheden af hver ende af den nævnte vandmasse findes i hvert fald én højtryksdyse til tilvejebringelse 30 af et nedad rettet vandtæppe, der virker til at tilbageholde og begrænse vandmassen ved den pågældende ende, og ved bunden af kanalen er indrettet vandudløbsslidser, som strækker sig over hele kanalens bredde og er indrettet til modtagelse af vandtæpperne, og et antal vand-35 udløbsslidser er indrettet mellem vandtæpperne ved stangmaterialets udgangsende, kendetegnet DK 1S8287B ved, at kanalens (1) dæksel er delt i mindst fire sektioner (6, 7, 8, 9), der er adskilt ved mindst tre slidser (11, 12, 13), der strækker sig over kanalens hele bredde, hvorhos de af dyser (14, 15 og 16) tilvejebragte 5 vandtæpper (17, 18, 19) gennem disse slidser (11, 12, 13. virker over kanalens fulde bredde, at den centrale dækselsektion (7) beliggende over vandmassen (10) mellem den sidste slids (11) ved kanalens indgangsende for stangmaterialet og den første slids (12) ved udgangsen-10 den har et antal åbninger (7a) til opadgående udslipning af luft eller vand fra kanalen, og at kanalen (1) strækker sig udenfor den sidste højtryksdyse (16), idet der i bunden af denne forlængede del (25) er indrettet et antal vandudløbsslidser (26).DK 158287 B As can be seen from FIG. 3, the water "blanket 17 extends over the full width of the channel 1. The blanket leaves the channel through the aperture formed by the slot 21 in the bottom of the channel 20. An unseen collector 5 below the bottom 20 captures the water coming out The leading edges of sections 6, 7, 8 and 9 of the cooling unit's straightening cover are all formed so that the running rod material cannot be trapped in any of the slots 11, 12 and 10 13 or between them. As shown in Fig. 1, the central section 7 of the canopy 1 of the channel 1, i.e. the section between the water blanket 17 at the entrance end of the rod material and the first blanket 18 at the outlet end, has a number of openings 7a. These openings 7a allow for rapid discharge of water. , for example, in the event that a rod with a deformed, for example, bent, front end enters the body of water, thus avoiding disturbances of the body of water which could jeopardize its stability. hot rolled rod material, in particular steel, in which the rod material is passed longitudinally through a body of water held in a duct having rectangular vertical cross-section, which duct is provided with a plurality of water supply openings in the vertical sidewalls and has a removable cover, wherein at least one high pressure nozzle is provided at each end of said body of water to provide a downwardly directed blanket which acts to retain and limit the body of water at that end, and at the bottom of the channel are provided outlet water slots which extend the entire width of the channel and is arranged to receive the water blankets, and a number of water outlet slots are arranged between the water blankets at the outlet end of the rod material, characterized in that the cover of the channel (1) is divided into at least four sections (6, 7, 8, 9) separated by at least three slots (11, 12, 13) extending over the entire width of the channel, wherein the a f nozzles (14, 15 and 16) provided 5 blankets (17, 18, 19) through these slots (11, 12, 13. act over the full width of the duct) that the central cover section (7) located above the body of water (10) between the last slot (11) at the entrance end of the bar material and the first slot (12) at the exit end 10 has a plurality of openings (7a) for upward discharge of air or water from the channel, and the channel (1) extends beyond the last a high pressure nozzle (16), a plurality of water outlet slots (26) being arranged at the bottom of this extended portion (25).
DK082279A 1978-02-27 1979-02-26 DEVICE FOR CONTINUOUS COOLING OF HOT-ROLLED BAR MATERIAL DK158287C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL7802133.A NL165080C (en) 1978-02-27 1978-02-27 DEVICE FOR CONTINUOUS COOLING OF HOT ROLLED BAR MATERIAL.
NL7802133 1978-02-27

Publications (3)

Publication Number Publication Date
DK82279A DK82279A (en) 1979-08-28
DK158287B true DK158287B (en) 1990-04-30
DK158287C DK158287C (en) 1990-11-12

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ID=19830403

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Application Number Title Priority Date Filing Date
DK082279A DK158287C (en) 1978-02-27 1979-02-26 DEVICE FOR CONTINUOUS COOLING OF HOT-ROLLED BAR MATERIAL

Country Status (10)

Country Link
BE (1) BE874440A (en)
DE (2) DE2954484C2 (en)
DK (1) DK158287C (en)
FR (1) FR2418038A1 (en)
GB (1) GB2015583B (en)
IT (1) IT1119657B (en)
LU (1) LU80963A1 (en)
NL (1) NL165080C (en)
NO (1) NO150870C (en)
SE (1) SE7901713L (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2428736A1 (en) * 1978-06-16 1980-01-11 Honda Motor Co Ltd ROTARY VALVE FOR INTERNAL COMBUSTION ENGINES
ES8704361A1 (en) * 1985-04-12 1987-04-01 Centre Rech Metallurgique A method and apparatus for cooling an advancing elongate metal product

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3208742A (en) 1962-02-16 1965-09-28 United States Steel Corp Apparatus for spray quenching
US3897230A (en) * 1973-05-09 1975-07-29 Inland Steel Co Cooling system
NL156445B (en) * 1973-06-04 1978-04-17 Hoogovens Ijmuiden Bv DEVICE FOR COOLING BAR AND WIRE MATERIAL.
GB1595312A (en) 1977-02-07 1981-08-12 Davy Loewy Ltd Cooling apparatus
BE851382A (en) 1977-02-11 1977-05-31 Centre Rech Metallurgique IMPROVEMENTS IN METHODS AND DEVICES FOR COMBATING BURDING OF ROLLER CYLINDERS

Also Published As

Publication number Publication date
IT7967421A0 (en) 1979-02-26
NO150870C (en) 1985-01-09
NL7802133A (en) 1979-08-29
GB2015583A (en) 1979-09-12
DE2907448A1 (en) 1979-09-06
DK158287C (en) 1990-11-12
DK82279A (en) 1979-08-28
FR2418038A1 (en) 1979-09-21
SE7901713L (en) 1979-08-28
NO150870B (en) 1984-09-24
LU80963A1 (en) 1979-06-18
FR2418038B1 (en) 1983-09-30
GB2015583B (en) 1982-06-23
DE2954484C2 (en) 1990-06-07
DE2907448C2 (en) 1986-07-10
BE874440A (en) 1979-08-27
NL165080C (en) 1981-03-16
IT1119657B (en) 1986-03-10
NO790643L (en) 1979-08-28

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