NO148629B - EXTRADES FOR EXPRESSING A STRING OF VISCASTIC MATERIAL, SPECIFICALLY LEATHER OR SIMILAR MATERIAL - Google Patents
EXTRADES FOR EXPRESSING A STRING OF VISCASTIC MATERIAL, SPECIFICALLY LEATHER OR SIMILAR MATERIAL Download PDFInfo
- Publication number
- NO148629B NO148629B NO780855A NO780855A NO148629B NO 148629 B NO148629 B NO 148629B NO 780855 A NO780855 A NO 780855A NO 780855 A NO780855 A NO 780855A NO 148629 B NO148629 B NO 148629B
- Authority
- NO
- Norway
- Prior art keywords
- housing
- extruder
- transport
- string
- drum
- Prior art date
Links
- 239000000463 material Substances 0.000 title claims description 29
- 238000007789 sealing Methods 0.000 claims description 8
- 239000004927 clay Substances 0.000 claims description 4
- 239000011345 viscous material Substances 0.000 claims description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
- B30B11/22—Extrusion presses; Dies therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
- B28B3/208—Exchangeable wear parts, e.g. liners
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
- B28B3/22—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded by screw or worm
- B28B3/224—Twin screw extruders, e.g. double shaft extruders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/465—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
- Materials For Medical Uses (AREA)
- Cosmetics (AREA)
- Paper (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Description
1 1
Oppfinnelsen vedrører en ekstruder for utpressing av en The invention relates to an extruder for extruding a
streng av viskøst materiale, særlig lere eller lerelignende materiale, med en roterende transporttrommel som er anordnet i et med en innløps- og utløpsåpning forsynt hus, hvilken trommel har over sin periferi anordnet transportorganer som transporterer materialet langs husveggen til utløpsåpningen. string of viscous material, in particular clay or clay-like material, with a rotating transport drum which is arranged in a housing provided with an inlet and outlet opening, which drum has on its periphery arranged transport means which transport the material along the housing wall to the outlet opening.
En ekstruder av den innledningsvis nevnte type er kjent. An extruder of the initially mentioned type is known.
Det har vært en oppgave ved nærværende oppfinnelse å ytterligere forbedre denne kjente ekstruder. Dette oppnås ifølge oppfinnelsen ved at rotasjonstrommelens sider er avtettet med en tetningsanordning (25), fortrinnsvis en labyrint-tetning, mot huset (8), idet dette har en anordning (29) for tilbake-føring av gjennom tetningen gjennomført materiale til inn-løpsåpningen (11). It has been a task of the present invention to further improve this known extruder. This is achieved according to the invention by the sides of the rotary drum being sealed with a sealing device (25), preferably a labyrinth seal, against the housing (8), as this has a device (29) for returning material passed through the seal to the inlet opening (11).
Spesielt kan tetningsanordningen ha et på siden av transport-tromlen; anordnet spor for opptagelse av gjennomstrømmende materialer, i hvilket spor en på huset fast anordnet skraper griper inn, hvis utgangsside står i forbindelse med innløps-åpningen til huset over en åpning. Det er spesielt fordel-aktig å utruste huset, også i tetningsområdet på transport-organets endesider, med en utbyttbar foring, for i tilfelle av slitasje bare å måtte utbytte foringen. In particular, the sealing device can have one on the side of the transport drum; arranged track for recording through-flowing materials, in which track a scraper fixed to the housing engages, the output side of which is in connection with the inlet opening to the housing over an opening. It is particularly advantageous to equip the housing, also in the sealing area on the end sides of the transport member, with a replaceable liner, so that in the event of wear the liner only needs to be replaced.
Ekstruderen egner seg for de forskjelligste viskøse materialer, som f.eks. for pressing av slam, cellulose, kjøttmasser, og spesielt av leire eller leirelignende materialer. The extruder is suitable for a wide variety of viscous materials, such as e.g. for pressing sludge, cellulose, pulp, and especially clay or clay-like materials.
I det følgende skal man ved hjelp av tegninger beskrive ut-førelseseksemplet av ekstruderen ifølge oppfinnelsen. In the following, the design example of the extruder according to the invention will be described with the help of drawings.
Fig. 1 viser en totrinns ekstruder for leirematerialer i Fig. 1 shows a two-stage extruder for clay materials i
delvis lengdesnitt. partial longitudinal section.
Fig. 2 viser ekstruderen fra fig. 1 i snitt II-II av fig. 1. Fig. 3 viser hovedpressen, som danner det andre trinnet, i vertikalt lengdesnitt og i større målestokk. Fig. 2 shows the extruder from fig. 1 in section II-II of fig. 1. Fig. 3 shows the main press, which forms the second stage, in vertical longitudinal section and on a larger scale.
Figurene 1 og 2 viser en totrinns ekstruder, som består av en hovedpresse 1 og en forpresse 2 som er forbundet over en forbindingskanal 3. Forbindingskanal 3 er i det viste utfør-elseseksemplet utformet som undertrykkammer. Driften av hovedpressen 1 skjer ved hjelp av et drivverk 4, som er forbundet ved hjelp av en remdrift 5, med en drivmotor. Analogt blir også forpressen 2, som i foreliggende eksempel er en skruepresse, drevet ved hjelp av et drivverk 6 og en remdrift 7. Figures 1 and 2 show a two-stage extruder, which consists of a main press 1 and a pre-press 2 which are connected via a connection channel 3. In the embodiment shown, connection channel 3 is designed as a vacuum chamber. The operation of the main press 1 takes place by means of a drive mechanism 4, which is connected by means of a belt drive 5 to a drive motor. Analogously, the pre-press 2, which in the present example is a screw press, is also driven by means of a drive mechanism 6 and a belt drive 7.
Hovedpressen inneholder et hus 8 med en utsparing 9 for opptagelse av en roterende transporttrommel 10, og hvis hus inneholder såvel en innløpsåpning 11 som en utløpsåpning 12. Transporttrommelen har rundt sin omkrets flere over transport-trommelens lengde fordelte og i periferiretningen liggende og praktisk talt til husets vegg utstrekkende ringformede fremspring 13 med samme høyde. Ved innløpsåpningen 11 finnes en roterende tilførselsvalse 14, som presser det tilførte materialet inn i mellomrommene mellom fremspringene 13. Ved utløpsåpningen 12 er det anordnet en avstrykningskam 15 som inneholder mellom fremspringene 13 inngripende sinker, og som overtar materialet mellom fremspringene 13 i transporttrommel 10. The main press contains a housing 8 with a recess 9 for receiving a rotating transport drum 10, and whose housing contains both an inlet opening 11 and an outlet opening 12. the house wall extending ring-shaped protrusions 13 of the same height. At the inlet opening 11, there is a rotating supply roller 14, which presses the supplied material into the spaces between the projections 13. At the outlet opening 12, a wiping comb 15 is arranged which contains sinkers intervening between the projections 13, and which takes over the material between the projections 13 in the transport drum 10.
Tilførselsvalsen 14 oppviser en sylindrisk og glatt overflate, og den ligger praktisk talt an mot de ringformige fremspringene 13. Med en avstryker 17 føres det avstrøkede materialet til transporttrommelen 10. Via en innstillingsanordning 18 er avstryker 17 innstillbar i forhold til tilførselsvalsen 14. The supply roller 14 has a cylindrical and smooth surface, and it practically rests against the annular projections 13. With a scraper 17, the scraped material is fed to the transport drum 10. Via an adjustment device 18, the scraper 17 can be adjusted in relation to the supply roller 14.
De ringformige fremspringene 13 a og 13 b dannes ved hjelp av ringsegmentene 19, som i foreliggende tilfelle utgjør en fjerdedel av ringen. Disse ringsegment er anordnet på en baeresylinder 2 0 og holde;s på avstand ved hjelp av avstands-ringer 21. Ringsegmentene 19 og avstandsringene 21 er sikret mot forvridning ved hjelp av kilene 22 på bæresylinder 20. Ringsegmentene 19, som danner fremspringene 13, sammenholdes sammen med avstandsringene 21 ved hjelp av en spennanordning 23 . The annular projections 13 a and 13 b are formed by means of the ring segments 19, which in the present case make up a quarter of the ring. These ring segments are arranged on a bearing cylinder 20 and are kept at a distance by means of spacer rings 21. The ring segments 19 and the spacer rings 21 are secured against distortion by means of the wedges 22 on the bearing cylinder 20. The ring segments 19, which form the projections 13, are held together together with the spacer rings 21 by means of a clamping device 23 .
Sidene av transporttrommelen 10 er tettet mot huset med eh tetningsanordning 25. Tetningsanrodningen er fortrinnsvis utformet som labyrinttetning, og oppviser et ringspor 2 6 hvori en ringflens 27 tilhørende huset inngriper. Utad slutter seg til dette ringspor 26 et ytterligere ringspor 28 hvori fore-kommende materiale innkommer, hvilket materiale går gjennom det av ringflensen 27 beskyttede ringspor 26. I det ytre ringspor 28 stikker en tilbakeføringsanordning 29 inn, hvilken avtar det i det ytre ringspor 28 inntrengte og nærværende' materiale ved hjelp av en skraper 30, hvilket materiale til-bakeføres gjennom en åpning 31 til hovedpressens innløps-åpning 11. The sides of the transport drum 10 are sealed against the housing with a sealing device 25. The sealing arrangement is preferably designed as a labyrinth seal, and exhibits an annular groove 26 in which an annular flange 27 belonging to the housing intervenes. On the outside, this annular groove 26 is joined by a further annular groove 28 into which existing material enters, which material passes through the annular groove 26 protected by the annular flange 27. Into the outer annular groove 28 a return device 29 protrudes, which reduces what has penetrated into the outer annular groove 28 and present material by means of a scraper 30, which material is fed back through an opening 31 to the inlet opening 11 of the main press.
Utsparingen 9 i huset 8 er forsynt med en slitasjefast og utbyttbar foring 32, hvilken beskytter huset mot slitasje. The recess 9 in the housing 8 is provided with a wear-resistant and replaceable lining 32, which protects the housing against wear.
Utløpsåpningen 12 dannes av en husdel 34 som er skilt fra det øvrige huset 8, og som kan åpnes og borttas. The outlet opening 12 is formed by a housing part 34 which is separated from the rest of the housing 8, and which can be opened and removed.
Som det spesielt fremgår av fig. 3, oppviser huset en husplate 35 som dekker den ene frontsiden til utsparingen 9 for transporttrommelen 10. Husplaten bærer det ene lageret 36 til ak-sel 37 på hvilken transporttrommelen 10 er anordnet. Husplaten 35 er avtagbar hvorved samtidig lageret 36 trekkes av akse- As can be seen in particular from fig. 3, the housing has a housing plate 35 which covers one front side of the recess 9 for the transport drum 10. The housing plate carries the one bearing 36 for the shaft 37 on which the transport drum 10 is arranged. The housing plate 35 is removable, whereby at the same time the bearing 36 is pulled from the axis
len 37 under fullstendig frileggelse av transporttrommelen 10, og slik at denne kan trekkes av akselen. len 37 while completely exposing the transport drum 10, and so that this can be pulled off the axle.
Som det fremgår av figurene 1 og 2 er ekstruderen i nærværende eksempel utformet som en totrinns ekstruder. Det første trinnet danner forpressen 2, som er utformet som en skruepresse, og som foruten en viss bearbeidelse av materialet, som skal presses, avstedkommer et primærtrykk. Forpressen leverer materialet videre gjennom en gitterplate 51 til forbindelseskanalen 3, som er forbundet via en avsugningsledning 52 med en ikke nærmere vist avsugningsanordning. Forbindelseskanalen 3 blir derved evakuert, og herved oppnår man en større densitet på materialet som skal presses. Det således forbehandlede materialet kommer frem til innløpsåpningen 11 i ekstruderens andre trinn, dvs. hovedpressen, hvorved tilførselsvalsen 14 letter tilførselen av materiale til mellomrommene mellom fremspringene 13 til transporttrommel 10. Materialet medtas av trans-porttrommelens 10 fremspring 13 og bøyes ved hjelp av avstryk-ningskammen 15 til utløpsåpningen 12. As can be seen from Figures 1 and 2, the extruder in the present example is designed as a two-stage extruder. The first stage forms the pre-press 2, which is designed as a screw press, and which, in addition to some processing of the material to be pressed, produces a primary pressure. The pre-press delivers the material further through a grid plate 51 to the connection channel 3, which is connected via a suction line 52 to a suction device not shown in detail. The connection channel 3 is thereby evacuated, and thereby a greater density of the material to be pressed is achieved. The thus pretreated material arrives at the inlet opening 11 in the extruder's second stage, i.e. the main press, whereby the supply roller 14 facilitates the supply of material to the spaces between the protrusions 13 of the transport drum 10. The material is taken in by the protrusions 13 of the transport drum 10 and bent by means of wiping ning comb 15 to the outlet opening 12.
I motsetning til det ivste utførelseseksempel så kan forpressen med fordel også være slik utformet som det andre trinnet, nem-lig hovedpressen. Ved enkle ekstruderingsformål er også entrin-nede ekstrudere tilstrekkelig, og disse utgjøres da av en hovedpresse av den viste type. In contrast to the first embodiment, the pre-press can advantageously also be designed in the same way as the second stage, namely the main press. For simple extrusion purposes, single-stage extruders are also sufficient, and these are then made up of a main press of the type shown.
Ekstruderen er egnet for såvel materialer med høyt fuktinnhold såvel som for materialer med uvanlig lavt fuktinnhold, dvs. nesten tørt materiale. En tiltetning av ekstruderen fås praktisk talt ikke. Na;rværende gkstruder er spesielt uømfintlig overfor vekslinger i materialegenskaper. Ved å bytte ut hus-delene ved utløpsåpningen er det på enkel måte også mulig å endre profilen til den fremstilte strengen. Dette er mulig spesielt p.g.a. at transportorganet uten videre kan til-, passes de ved veksling av fremstilte strengeprofiler erholdte ekstruderingsegenskaper. The extruder is suitable for materials with a high moisture content as well as for materials with an unusually low moisture content, i.e. almost dry material. A sealing of the extruder is practically not achieved. Current gkstruder is particularly insensitive to changes in material properties. By replacing the housing parts at the outlet opening, it is also possible to easily change the profile of the produced string. This is possible especially due to that the transport means can be adjusted without further ado to the extrusion properties obtained by changing the manufactured string profiles.
Claims (2)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH57572A CH533007A (en) | 1972-01-14 | 1972-01-14 | Extrusion press for processing viscous material, especially clay or clay-like material |
| CH654572A CH538357A (en) | 1972-05-03 | 1972-05-03 | Extrusion press |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| NO780855L NO780855L (en) | 1973-07-17 |
| NO148629B true NO148629B (en) | 1983-08-08 |
| NO148629C NO148629C (en) | 1983-11-16 |
Family
ID=25685001
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO4842/72A NO139038C (en) | 1972-01-14 | 1972-12-29 | EXTRUSES FOR PROCESSING VISCOSE MATERIALS AND THEN SPECIAL CAMP OR CLAY-LIKE MATERIALS |
| NO780855A NO148629C (en) | 1972-01-14 | 1978-03-10 | EXTRADES FOR EXPRESSING A STRING OF VISCASTIC MATERIAL, SPECIFICALLY LEATHER OR SIMILAR MATERIAL |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO4842/72A NO139038C (en) | 1972-01-14 | 1972-12-29 | EXTRUSES FOR PROCESSING VISCOSE MATERIALS AND THEN SPECIAL CAMP OR CLAY-LIKE MATERIALS |
Country Status (20)
| Country | Link |
|---|---|
| JP (1) | JPS5147451B2 (en) |
| AR (1) | AR198811A1 (en) |
| AT (1) | AT324914B (en) |
| BE (1) | BE793939A (en) |
| BG (1) | BG22793A3 (en) |
| CS (1) | CS166832B2 (en) |
| DK (1) | DK152534C (en) |
| ES (1) | ES410185A1 (en) |
| FI (1) | FI51667C (en) |
| FR (1) | FR2167524A5 (en) |
| GB (1) | GB1421453A (en) |
| HU (1) | HU166765B (en) |
| IT (1) | IT975862B (en) |
| NL (1) | NL169436C (en) |
| NO (2) | NO139038C (en) |
| PL (1) | PL79182B1 (en) |
| RO (1) | RO89581A (en) |
| SE (1) | SE379667B (en) |
| TR (1) | TR17367A (en) |
| YU (1) | YU35975B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1111225A (en) * | 1977-05-11 | 1981-10-27 | Zehev Tadmor | Method and apparatus for processing polymeric material |
| US4582433A (en) * | 1984-12-20 | 1986-04-15 | Usm Corporation | Rotary processors and methods for liquid-liquid extraction |
| CN110026559A (en) * | 2019-04-24 | 2019-07-19 | 上海电机学院 | The continuous high pressure torsion deformation cycle reproducing method repeatedly of discarded titanium alloy chip |
| CN111823371B (en) * | 2020-07-13 | 2021-06-22 | 广东艾康环保科技有限公司 | High temperature resistant ceramic plunger machine |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE125598C (en) * | ||||
| DE638477C (en) * | 1933-12-03 | 1936-11-16 | Richard Raupach Maschinenfabri | Horizontal extrusion press for malleable, especially clay masses |
| DE1017511B (en) * | 1955-06-03 | 1957-10-10 | Keramostroj Narodni Podnik Zd | Extrusion press |
| DE1230341B (en) * | 1963-08-30 | 1966-12-08 | Rieter Werke Haendle | Extrusion press for ceramic bodies |
| US3452393A (en) * | 1965-12-29 | 1969-07-01 | Farmhand Inc | Apparatus for forming pellets |
| DE1976073U (en) * | 1967-10-25 | 1967-12-28 | Hummel Soehne H | BRIQUETTING PRESS. |
-
0
- BE BE793939D patent/BE793939A/en not_active IP Right Cessation
-
1972
- 1972-11-22 AT AT994172A patent/AT324914B/en not_active IP Right Cessation
- 1972-11-23 NL NLAANVRAGE7215882,A patent/NL169436C/en not_active IP Right Cessation
- 1972-11-24 IT IT70716/72A patent/IT975862B/en active
- 1972-11-27 HU HURI491A patent/HU166765B/hu unknown
- 1972-12-11 FR FR7243949A patent/FR2167524A5/fr not_active Expired
- 1972-12-13 YU YU3112/72A patent/YU35975B/en unknown
- 1972-12-15 PL PL1972159564A patent/PL79182B1/en unknown
- 1972-12-19 FI FI723600A patent/FI51667C/en active
- 1972-12-28 RO RO7273351A patent/RO89581A/en unknown
- 1972-12-29 ES ES410185A patent/ES410185A1/en not_active Expired
- 1972-12-29 NO NO4842/72A patent/NO139038C/en unknown
-
1973
- 1973-01-11 CS CS239A patent/CS166832B2/cs unknown
- 1973-01-11 TR TR17367A patent/TR17367A/en unknown
- 1973-01-12 DK DK017473A patent/DK152534C/en not_active IP Right Cessation
- 1973-01-12 BG BG022439A patent/BG22793A3/en unknown
- 1973-01-12 SE SE7300403A patent/SE379667B/xx unknown
- 1973-01-12 GB GB181473A patent/GB1421453A/en not_active Expired
- 1973-01-16 JP JP48007293A patent/JPS5147451B2/ja not_active Expired
-
1974
- 1974-01-10 AR AR246049A patent/AR198811A1/en active
-
1978
- 1978-03-10 NO NO780855A patent/NO148629C/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DK152534B (en) | 1988-03-14 |
| JPS5147451B2 (en) | 1976-12-15 |
| BE793939A (en) | 1973-05-02 |
| PL79182B1 (en) | 1975-06-30 |
| FI51667B (en) | 1976-11-30 |
| NO780855L (en) | 1973-07-17 |
| NO139038C (en) | 1978-12-27 |
| HU166765B (en) | 1975-05-28 |
| BG22793A3 (en) | 1977-04-20 |
| ES410185A1 (en) | 1976-04-16 |
| NO139038B (en) | 1978-09-18 |
| AR198811A1 (en) | 1974-07-24 |
| CS166832B2 (en) | 1976-03-29 |
| NL7215882A (en) | 1973-07-17 |
| SE379667B (en) | 1975-10-20 |
| DK152534C (en) | 1988-08-01 |
| AT324914B (en) | 1975-09-25 |
| YU311272A (en) | 1981-04-30 |
| GB1421453A (en) | 1976-01-21 |
| RO89581A (en) | 1986-06-30 |
| YU35975B (en) | 1981-11-13 |
| FI51667C (en) | 1977-03-10 |
| NO148629C (en) | 1983-11-16 |
| NL169436B (en) | 1982-02-16 |
| NL169436C (en) | 1982-07-16 |
| FR2167524A5 (en) | 1973-08-24 |
| TR17367A (en) | 1975-03-24 |
| IT975862B (en) | 1974-08-10 |
| JPS4881904A (en) | 1973-11-01 |
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