NO861117L - Measuring device. - Google Patents
Measuring device.Info
- Publication number
- NO861117L NO861117L NO861117A NO861117A NO861117L NO 861117 L NO861117 L NO 861117L NO 861117 A NO861117 A NO 861117A NO 861117 A NO861117 A NO 861117A NO 861117 L NO861117 L NO 861117L
- Authority
- NO
- Norway
- Prior art keywords
- sensor
- measuring device
- particles
- measuring
- line
- Prior art date
Links
- 239000002245 particle Substances 0.000 claims description 30
- 238000009826 distribution Methods 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 6
- 230000005693 optoelectronics Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 description 9
- 238000004458 analytical method Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000012798 spherical particle Substances 0.000 description 2
- 239000004484 Briquette Substances 0.000 description 1
- 229920000426 Microplastic Polymers 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000011437 continuous method Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000010410 dusting Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N15/14—Optical investigation techniques, e.g. flow cytometry
- G01N15/1429—Signal processing
- G01N15/1433—Signal processing using image recognition
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N15/14—Optical investigation techniques, e.g. flow cytometry
- G01N15/1456—Optical investigation techniques, e.g. flow cytometry without spatial resolution of the texture or inner structure of the particle, e.g. processing of pulse signals
- G01N15/1459—Optical investigation techniques, e.g. flow cytometry without spatial resolution of the texture or inner structure of the particle, e.g. processing of pulse signals the analysis being performed on a sample stream
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N15/14—Optical investigation techniques, e.g. flow cytometry
- G01N2015/1486—Counting the particles
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N15/14—Optical investigation techniques, e.g. flow cytometry
- G01N2015/1493—Particle size
Landscapes
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Dispersion Chemistry (AREA)
- Signal Processing (AREA)
- Pathology (AREA)
- Immunology (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Sorting Of Articles (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Investigating Or Analysing Biological Materials (AREA)
- Transplanting Machines (AREA)
- Measurement Of Radiation (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Description
Denne oppfinnelse angår en måleanordning for bestemmelseThis invention relates to a measuring device for determination
av størrelse og størrelsesfordeling av partikler i en produkt-strøm. of size and size distribution of particles in a product stream.
Ved mange produksjonsprosesser er det nødvendig å foretaIn many production processes it is necessary to carry out
en måling av partikkelstørrelsesfordelingen for kvalitetskon-troll. Optimale resultater blir oppnådd når målingen av stør-relsesf ordelingen kan skje raskt og ved kontinuerlig prøve-tagning fra produktstrømmen. Det er i det vesentlige fire måleprinsipper som er kjent: a measurement of the particle size distribution for quality control. Optimum results are achieved when the measurement of the size distribution can be done quickly and by continuous sampling from the product stream. There are essentially four measurement principles that are known:
- sikting og vindsikting- aiming and wind aiming
- sedimentasjon- sedimentation
- telleprosesser- counting processes
- optiske fremgangsmåter.- optical methods.
Valget av hvilke målemetoder som skal anvendes avhenger av størrelse og beskaffenhet av de produkter som skal analyseres. De enkelte metoder adskiller seg fra hverandre ved deres bruks-område såvel som ved de nødvendige installasjoner av teknisk art og tilhørende omkostninger. The choice of which measurement methods are to be used depends on the size and nature of the products to be analysed. The individual methods differ from each other in their area of use as well as in the necessary technical installations and associated costs.
Geometrisk adskillelse av partiklene ved hjelp av sikting tillater i stor utstrekning bestemmelse av partikkelstørrelses-fordelinger. Metoden har følgende ulemper: - målefeil på grunn av foretrukne retninger hvis ikke partiklene har kuleform Geometrical separation of the particles by means of sieving allows the determination of particle size distributions to a large extent. The method has the following disadvantages: - measurement errors due to preferred directions if the particles are not spherical
- tilstopning av maskene i sikten- clogging of the meshes in the sight
- slitasje av siktbelegg og av produktet- wear and tear of the screen coating and of the product
- siktdukens toleranser- the tolerances of the screen cloth
- bare få målepunkter for den totale fordeling- only a few measurement points for the total distribution
- omfattende tekniske installasjoner for kontinuerlige målinger. - extensive technical installations for continuous measurements.
Vindsikting er som fysikalsk adskillelsesmetode avhengigAs a physical separation method, wind screening is dependent
av tetthet, gasstemperatur og partikkelform. En kontinuerlig metode vil også her være meget kostbar når den totale fordeling skal beskrives. of density, gas temperature and particle shape. A continuous method will also be very expensive here when the total distribution is to be described.
Sedimentasjonsmetoder blir fortrinnsvis anvendt for partik-kelanalyse i størrelsesområdet < 50 ym. Sedimentasjonen brukes f.eks. i malm-, kull- og kisindustrien for klassifisering i Sedimentation methods are preferably used for particle analysis in the size range < 50 ym. The sedimentation is used e.g. in the ore, coal and briquette industries for classification i
stor skala, imidlertid ikke for analyse av resulterende produkter . large scale, however, not for analysis of resulting products.
Tellemetoder og optiske metoder, f.eks. fotonkorrelasjons- Counting methods and optical methods, e.g. photon correlation
spektroskopi eller billedanalyse er egnet for partikkelstørrel-ser fra 0,05 ym til større dimensjoner. Disse metoder har imidlertid følgende ulemper: - et sterkt begrenset måleområde for det aktuelle anvendte apparat - omstendelig preparering, henholdsvis strenge krav til prøveforberedelsen spectroscopy or image analysis is suitable for particle sizes from 0.05 um to larger dimensions. However, these methods have the following disadvantages: - a severely limited measurement range for the device in question used - laborious preparation, respectively strict requirements for sample preparation
- dispergering i en væske- dispersion in a liquid
- høye tekniske isolasjonsomkostninger for kontinuerlige målinger. - high technical insulation costs for continuous measurements.
For å unngå de foran omtalte ulemper ved de hittil vanlige målemetoder er det en oppgave for denne oppfinnelse å angi en teknisk mest mulig enkel måleanordning for bestemmelse av størrelse og størrelsesfordeling av partikler, anvendbar for en kontinuerlig prøvetagning fra en produktstrøm. Den nye måleanordning skal spesielt tilfredsstille følgende fordringer: In order to avoid the previously mentioned disadvantages of the hitherto common measurement methods, it is a task for this invention to specify a technically as simple as possible measuring device for determining the size and size distribution of particles, applicable for a continuous sampling from a product stream. The new measuring device must in particular satisfy the following requirements:
- berøringsfri og slitasjefri måling- contact-free and wear-free measurement
- ingen feil som følge av foretrukne retninger ved ikke-kuleformige partikler - no errors due to preferred directions for non-spherical particles
- høyt prøvegjennomløp- high sample throughput
- hurtig datamaskinassistert beregning- fast computer-assisted calculation
- ikke ømfintlig for rystelser og tilstøving.- not sensitive to vibrations and dusting.
For løsning av oppgaven blir det foreslått en måleanordning som ifølge foreliggende oppfinnelse erkarakterisert veden enkeltskilleinnretning for partiklene og efter denne en målecelle bestående av en målekanal med en til siden anordnet optoelektronisk sensor samt en beregningsinnretning tilkoblet sensoren for å bestemme partikkelstørrelse og størrelsesfor-deling. To solve the task, a measuring device is proposed which, according to the present invention, is characterized as a single separation device for the particles and after this a measuring cell consisting of a measuring channel with an optoelectronic sensor arranged to the side as well as a calculation device connected to the sensor to determine particle size and size distribution.
<y>tterligere detaljer og fordelaktige utførelsesformer av måleanordningen ifølge oppfinnelsen skal beskrives i det følgen-de under henvisning til et eksempel vist på tegningen. Further details and advantageous embodiments of the measuring device according to the invention shall be described in the following with reference to an example shown in the drawing.
Fra en produktstrøm 2 som fremføres ved hjelp av en tran-sportinnretning 1 og som består av kornformig gods blir det kontinuerlig eller med regelmessig gjentatte tidsintervaller tatt ut en prøve 3. Uttak av prøven skjer f.eks. ved hjelp av et rør 4 med en langsgående sliss som periodisk blir beveget gjennom produktstrømmen. Prøven føres over en transportvei 5 og en trakt 6 som slutter seg til denne, til to efter hverandre anordnede vibrasjonsrenner 7 og 8 for enkeltvis adskillelse og transport av partiklene i prøven. Opptellingen til enkelt-partikler kan selvsagt også foretas ved hjelp av andre egnede innretninger, f.eks. en dreierør-prøvedeler. De to vibrasjonsrenner drives med ulik fremføringshastighet, for å avstedkomme en avstand mellom de enkelte partikler i transportretningen. A sample 3 is taken continuously or at regularly repeated time intervals from a product stream 2 which is conveyed using a transport device 1 and which consists of granular material. The sample is taken e.g. by means of a tube 4 with a longitudinal slit which is periodically moved through the product flow. The sample is conveyed over a transport path 5 and a funnel 6 which joins this, to two successively arranged vibration chutes 7 and 8 for individual separation and transport of the particles in the sample. The counting of single particles can of course also be carried out using other suitable devices, e.g. a rotary tube sample divider. The two vibrating chutes are operated at different forward speeds, in order to create a distance between the individual particles in the direction of transport.
Efter skilleinnretningen 7, 8 følger en målecelle 9 som består av en vertikal målekanal 10 i form av et rør, en optoelektronisk sensor 12 anordnet til siden og på høyde med en gjennomgående åpning 11 i røret, og en lyskilde 13 som gjennomlyser kanalen i retning mot sensoren. Som sensor blir det fortrinnsvis anvendt en billedbearbeidende CCD-linjesensor eller et linjekamera, ved hvilke det i det vesentlige ved monolittisk integrasjon er anordnet et flertall fotoelementer, f.eks. 2048, hver med en overflate på 13 x 13 ym i linjeform. Elektriske ladninger som genereres i disse ved optisk stråling kan for-skyves i styretakter fra en lagringssone til den neste. Nærmere angivelser om slike sensorer kan finnes i faglitteraturen eller i tekniske datablad fra produsentene. After the separation device 7, 8 follows a measuring cell 9 which consists of a vertical measuring channel 10 in the form of a tube, an optoelectronic sensor 12 arranged to the side and at the height of a through opening 11 in the tube, and a light source 13 which illuminates the channel in the direction towards the sensor. As a sensor, an image-processing CCD line sensor or a line camera is preferably used, in which a plurality of photo elements are arranged essentially by monolithic integration, e.g. 2048, each with a surface of 13 x 13 ym in line form. Electric charges that are generated in them by optical radiation can be shifted in control cycles from one storage zone to the next. More detailed information about such sensors can be found in the specialist literature or in technical data sheets from the manufacturers.
De partikler 15 som fra den annen vibrasjonsrenne 8 gjennom et V-formet utløp 14 enkeltvis og efter hverandre faller fritt gjennom målekanalen 10, blir avbildet ved gjennomlysnings-belysningen mot sensoren. En beregningselektronikkenhet 16 som står i forbindelsen med sensoren avtaster de linjer som består av fotoelementene (de såkalte pixels) med en frekvens på f.eks. 5 kHz, slik at partikkelen under sin bevegelse blir detektert flere ganger. Herunder blir antallet av ikke-belyste pixels tellet og det høyeste antall som svarer til det høyeste partik-kelklaremål registreres. Beregningselektronikken vil på dette grunnlag sammen med antallet av målte partikler angi partikkel-størrelsesfordelingen. Egnede beregningsinnretninger kan være kommersielt tilgjengelige datamaskiner eller prosessregnemas-kiner. Til beregningsinnretningen 16 er det koblet en utgangs-enhet 17, f.eks. en skriver. The particles 15 which from the second vibration chute 8 through a V-shaped outlet 14 individually and successively fall freely through the measuring channel 10, are imaged by the transillumination towards the sensor. A computing electronics unit 16 that is connected to the sensor scans the lines that consist of the photo elements (the so-called pixels) with a frequency of e.g. 5 kHz, so that the particle is detected several times during its movement. Below, the number of non-illuminated pixels is counted and the highest number corresponding to the highest particle resolution is recorded. On this basis, the calculation electronics together with the number of measured particles will indicate the particle size distribution. Suitable calculation devices can be commercially available computers or process calculators. An output unit 17 is connected to the calculation device 16, e.g. a printer.
Som lyskilde 13 er spesielt slike egnet som frembringer kvasiparallelt likerettet lys (Gleichlicht). Målingen kan imidlertid også gjennomføres med divergerende eller konvergeren-de lys. For å hindre innvirkning av uvedkommende lys kan man også arbeide med infrarødt lys, monokromatisk lys eller vekslende lys som fordelaktig er synkronisert med avtastnings-frekvensen. Efter omstendighetene kan lyskilden utelates når de partikler som skal analyseres har en egen stråling. Like-ledes kan refleksjon fra partiklene utnyttes. For de to sist-nevnte tilfeller må det imidlertid mellom målekarialen 10 og sensoren 12 anordnes en optikk som avstedkommer et skarpt bilde av partikkelen på sensoren. As light source 13, those that produce quasi-parallel rectified light (Gleichlicht) are particularly suitable. However, the measurement can also be carried out with divergent or converging light. To prevent the influence of extraneous light, one can also work with infrared light, monochromatic light or alternating light which is advantageously synchronized with the scanning frequency. Depending on the circumstances, the light source can be omitted when the particles to be analyzed have their own radiation. Similarly, reflection from the particles can be used. For the two last-mentioned cases, however, an optic must be arranged between the measuring rod 10 and the sensor 12 which produces a sharp image of the particle on the sensor.
I bestemte tilfeller kan det være nødvendig ytterligere å avstedkomme en finere klassifisering av de partikler som skal analyseres, ved hjelp av en formfaktor. For dette formål blir det anordnet to eller flere linjesensorer eller linjekameraer i en definert vinkel, fortrinnsvis i rett vinkel til hverandre. In certain cases, it may be necessary to further produce a finer classification of the particles to be analysed, using a shape factor. For this purpose, two or more line sensors or line cameras are arranged at a defined angle, preferably at right angles to each other.
Forsøk i teknisk målestokk har vist at man med måleanordningen ifølge oppfinnelsen oppnår nøyaktige og reproduserbare analyseresultater ved høyt produktprøvegjennomløp, ikke bare med kuleformige partikler, men også med partikler som har uregelmessig form, såsom gjødnings- eller plastgranulat. Experiments on a technical scale have shown that with the measuring device according to the invention, accurate and reproducible analysis results are obtained at a high product sample throughput, not only with spherical particles, but also with particles that have an irregular shape, such as fertilizer or plastic granules.
Claims (6)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19853510363 DE3510363A1 (en) | 1985-03-22 | 1985-03-22 | MEASURING ARRANGEMENT FOR PARTICLE SIZE ANALYSIS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NO861117L true NO861117L (en) | 1986-09-23 |
Family
ID=6265995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO861117A NO861117L (en) | 1985-03-22 | 1986-03-21 | Measuring device. |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0195420A3 (en) |
| JP (1) | JPS61223632A (en) |
| BR (1) | BR8601290A (en) |
| DE (1) | DE3510363A1 (en) |
| DK (1) | DK130686A (en) |
| ES (1) | ES8706957A1 (en) |
| NO (1) | NO861117L (en) |
| ZA (1) | ZA862115B (en) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4814868A (en) * | 1987-10-02 | 1989-03-21 | Quadtek, Inc. | Apparatus and method for imaging and counting moving particles |
| NO163384C (en) * | 1987-12-18 | 1990-05-16 | Norsk Hydro As | PROCEDURE FOR AUTOMATIC PARTICLE ANALYSIS AND DEVICE FOR ITS PERFORMANCE. |
| GB8927742D0 (en) * | 1989-12-07 | 1990-02-07 | Diatec A S | Process and apparatus |
| DE4004699A1 (en) * | 1990-02-15 | 1991-08-22 | Krieg Gunther | Photographically measuring size distribution of ground coffee - taken by gas stream through transverse light beam |
| DE4118716A1 (en) * | 1990-07-16 | 1992-01-23 | Gerhart Schroff | METHOD AND ARRANGEMENT FOR THE OPTICAL DETECTION AND EVALUATION OF SPREADING LIGHT SIGNALS |
| JPH0812146B2 (en) * | 1991-04-12 | 1996-02-07 | 秩父小野田株式会社 | Fineness measuring machine |
| DE4309939C2 (en) * | 1993-03-26 | 1996-10-02 | Guenter Dr Ing Dau | Method and device for the fully automatic analysis of the mixing quality of solid mixers |
| DE4334737C1 (en) * | 1993-10-12 | 1995-03-30 | Allgaier Werke Kg | Method and device for monitoring the screening efficiency of a screening machine |
| DE19627225A1 (en) | 1996-07-05 | 1998-01-08 | Focke & Co | Method and device for opto-electrical scanning of packaging, in particular cigarette packs |
| CA2194534A1 (en) * | 1997-01-07 | 1998-07-07 | Maztech Microvision Ltd. | Method and apparatus for quantifying particle components |
| DE19733317A1 (en) * | 1997-08-01 | 1999-02-04 | Neuhaus Neotec Maschinen Und A | Method and device for handling a regrind |
| US6960756B1 (en) * | 2001-11-15 | 2005-11-01 | Visionworks Llc | Particle size and shape distribution analyzer |
| DE102004056520A1 (en) * | 2004-11-24 | 2006-06-01 | Amazonen-Werke H. Dreyer Gmbh & Co. Kg | Method for determining the particle shape and / or size of agricultural good particles |
| DE102005048744A1 (en) * | 2005-10-10 | 2007-04-12 | Amazonen-Werke H. Dreyer Gmbh & Co. Kg | Device for optically counting small grains |
| DE102006049517A1 (en) * | 2006-10-20 | 2008-04-24 | Haver & Boecker Ohg | Device for determining parameters of a bulk material particle flow |
| DE102009056503A1 (en) | 2009-12-02 | 2011-06-09 | Haver & Boecker Ohg | Particle meter, in particular for the analysis of grain sizes of fine and finest bulk materials |
| DE202014100974U1 (en) * | 2014-03-04 | 2015-06-08 | Retsch Technology Gmbh | Device for determining the particle size and / or the particle shape of a particle mixture |
| DK180012B1 (en) * | 2016-08-30 | 2020-01-22 | Scangrading Aps | Measuring instrument for analyzing particles and especially for analyzing small particles |
| CO2019008351A1 (en) * | 2019-07-30 | 2019-10-21 | Esenttia S A | Instrumental method for evaluating the efficiency of a die and a polyolefin cutting system in an extruder |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1722751A (en) * | 1927-11-19 | 1929-07-30 | Bell Telephone Labor Inc | Optical inspection system |
| GB1479972A (en) * | 1975-02-19 | 1977-07-13 | Coal Ind | Particle sizing apparatus |
| US4457434A (en) * | 1982-02-01 | 1984-07-03 | Fmc Corporation | Apparatus for orienting, singulating and sizing mushrooms and like objects |
| DE3427535C2 (en) * | 1984-07-26 | 1986-10-02 | Lorenz Ing.(grad.) 4722 Ennigerloh Bohle | Device for classifying lumpy, oblong-shaped products |
-
1985
- 1985-03-22 DE DE19853510363 patent/DE3510363A1/en not_active Withdrawn
-
1986
- 1986-03-18 EP EP86103677A patent/EP0195420A3/en not_active Withdrawn
- 1986-03-19 JP JP61059628A patent/JPS61223632A/en active Pending
- 1986-03-21 BR BR8601290A patent/BR8601290A/en unknown
- 1986-03-21 NO NO861117A patent/NO861117L/en unknown
- 1986-03-21 ZA ZA862115A patent/ZA862115B/en unknown
- 1986-03-21 DK DK130686A patent/DK130686A/en not_active Application Discontinuation
- 1986-03-21 ES ES553247A patent/ES8706957A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ZA862115B (en) | 1986-11-26 |
| ES553247A0 (en) | 1987-07-01 |
| EP0195420A2 (en) | 1986-09-24 |
| EP0195420A3 (en) | 1988-01-27 |
| BR8601290A (en) | 1986-12-02 |
| DE3510363A1 (en) | 1986-09-25 |
| DK130686A (en) | 1986-09-23 |
| ES8706957A1 (en) | 1987-07-01 |
| JPS61223632A (en) | 1986-10-04 |
| DK130686D0 (en) | 1986-03-21 |
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