NO137228B - COMPOSED ROLLER. - Google Patents
COMPOSED ROLLER. Download PDFInfo
- Publication number
- NO137228B NO137228B NO2783/73A NO278373A NO137228B NO 137228 B NO137228 B NO 137228B NO 2783/73 A NO2783/73 A NO 2783/73A NO 278373 A NO278373 A NO 278373A NO 137228 B NO137228 B NO 137228B
- Authority
- NO
- Norway
- Prior art keywords
- approx
- aluminum oxide
- briquettes
- charcoal
- solution
- Prior art date
Links
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 10
- 239000003513 alkali Substances 0.000 claims description 8
- 239000003610 charcoal Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 229910001388 sodium aluminate Inorganic materials 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000008240 homogeneous mixture Substances 0.000 claims description 3
- 150000008044 alkali metal hydroxides Chemical class 0.000 claims description 2
- 150000004645 aluminates Chemical class 0.000 claims description 2
- 238000005530 etching Methods 0.000 claims 1
- 239000000243 solution Substances 0.000 description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 235000011121 sodium hydroxide Nutrition 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 235000009754 Vitis X bourquina Nutrition 0.000 description 1
- 235000012333 Vitis X labruscana Nutrition 0.000 description 1
- 240000006365 Vitis vinifera Species 0.000 description 1
- 235000014787 Vitis vinifera Nutrition 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- CAVCGVPGBKGDTG-UHFFFAOYSA-N alumanylidynemethyl(alumanylidynemethylalumanylidenemethylidene)alumane Chemical compound [Al]#C[Al]=C=[Al]C#[Al] CAVCGVPGBKGDTG-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- -1 aluminum halide Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 239000002006 petroleum coke Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000012047 saturated solution Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/03—Sleeved rolls
- B21B27/035—Rolls for bars, rods, rounds, tubes, wire or the like
Landscapes
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Rolls And Other Rotary Bodies (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
- Massaging Devices (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
Description
Fremgangsmåte for fremstilling av briketter som hovedsakelig består av aluminiumoksyd og kullstoff. Process for the production of briquettes which mainly consist of aluminum oxide and charcoal.
Oppfinnelsen angår en fremgangsmåte for fremstilling av briketter som hovedsakelig består av aluminiumoksyd og kullstoff, hvor begge elementer er i intim berøring slik at de fremstillede blandinger eventuelt er sterkt reaktive. The invention relates to a method for producing briquettes which mainly consist of aluminum oxide and charcoal, where both elements are in intimate contact so that the prepared mixtures are possibly highly reactive.
Fremgangsmåten gjør det også mu-lig å fremstille briketter som delvis ef po-røse og lett gjenomtrengelige for gasser som f. eks. for nitrogen, luft, klor og dels har en enkel geometrisk form f. eks. kule-form, og har så like dimensjoner som mu-lig.. The method also makes it possible to produce briquettes that are partially porous and easily permeable to gases such as e.g. for nitrogen, air, chlorine and partly has a simple geometric shape, e.g. ball-shaped, and have as similar dimensions as possible..
Videre har brikettene en utmerket Furthermore, the briquettes have an excellent
mekanisk fasthet og spesielt stor elek-trisk motstand, fra vanlig temperatur opp til ca. 1800° C. Selv om brikettene blir var-met opp til slike høye temperaturer som nevnt foregår det heller ikke i nevnever-dig grad noen delvis sammensmelting eller sintring som kan føre til at det dannes store klumper f. eks. med drueform og som vil vanskeliggjøre eller begrense bruken av brikettene. mechanical strength and particularly high electrical resistance, from normal temperature up to approx. 1800° C. Even if the briquettes are heated to such high temperatures as mentioned, no partial fusion or sintering takes place to any significant extent, which could lead to the formation of large lumps, e.g. with a grape shape and which will make it difficult or limit the use of the briquettes.
De andre hensiktene med oppfinnelsen vil fremgå av den følgende beskrivelse. The other purposes of the invention will be apparent from the following description.
Oppfinnelsen går ut på en fremgangsmåte for fremstilling av briketter som hovedsakelig består av aluminiumoksyd og kullstoff, ,ved at aluminiumoksyd og kullstoff i pulverform med en kornstørrelse på ca. 150 [x eller mindre blandes intimt slik at det oppnås en omtrent homogen ■ blanding, hvoretter det tilsettes en etsal-kalioppløsning, fortrinsvis med én konsen-trasjon på ca. 200 til 400 g alkalimetall-hydroksyd pr. liter i en sådan mengde at vektforholdet mellom etsalkalioppløsnin-gen og blandingen av aluminiumoksyd og kullstoff er mellom ca. 5 og 20 pst. og fortrinsvis av størrelsesordenen ca. 10 til 15 pst. og den deig som fremkommer på den-ie måten granuleres og tørkes ved opp-varming til mellom ca. 100 til 200° C. The invention is based on a method for the production of briquettes which mainly consist of aluminum oxide and charcoal, in that aluminum oxide and charcoal in powder form with a grain size of approx. 150 [x or less are mixed intimately so that an approximately homogeneous ■ mixture is obtained, after which an etch-salt-potassium solution is added, preferably with one concentration of approx. 200 to 400 g of alkali metal hydroxide per liters in such an amount that the weight ratio between the eth-alkali solution and the mixture of aluminum oxide and carbon is between approx. 5 and 20 per cent and preferably of the order of approx. 10 to 15 per cent and the dough that is produced in this way is granulated and dried by heating to between approx. 100 to 200°C.
Som etsalkaliliit brukes det i henhold til oppfinnelsen vandige oppløsninger av natrium- eller kalium-hydroksyd, fortrinsvis konsentrerte, og som inneholder flere hundre gram av hydroksyd pr. liter, fortrinsvis ca. 200 til 400 g/l. I en spesiell utførelsesform blir det som etsalkalilut brukt alkalisk aluminat-oppløsning og, blant andre, enhver vandig natriumalumi-natbppløsning, fortrinsvis konsentrerte eller mettede. Den mengde av denne lut som settes til den omtrent homogene pulver-blanding av aluminiumoksyd og kullstoff varierer fra noen prosent til noen titalls "prosent, f. eks. fra 3 til 30 vektprosent, spesielt mellom 5 og 20 vektprosent og fortrinsvis ca. 10 til 15 vektprosent. According to the invention, aqueous solutions of sodium or potassium hydroxide, preferably concentrated, and which contain several hundred grams of hydroxide per litres, preferably approx. 200 to 400 g/l. In a particular embodiment, alkaline aluminate solution and, among others, any aqueous sodium aluminate solution, preferably concentrated or saturated, are used as alkali alkali solution. The amount of this lye that is added to the approximately homogeneous powder mixture of aluminum oxide and carbon varies from a few percent to a few tens of percent, e.g. from 3 to 30 percent by weight, especially between 5 and 20 percent by weight and preferably about 10 to 15 percent by weight.
I en foretrukket utførelsesform som kan gjennomføres kontinuerlig blir den homogene blanding av aluminiumoksyd og kullstoff ført inn i en knamaskin av «pille-typen» som omfatter en granuleringsskive eller trommel hvis akse danner en vinkel på ca. 30 til 60° med horisontalen og som svinger langsomt om denne akse. Alkaliluten blir samtidig tilført kna-maskinen i en mengde som i forhold til blandingen i det vesentlige tilsvarer den som er angitt ovenfor. In a preferred embodiment, which can be carried out continuously, the homogeneous mixture of aluminum oxide and carbon is introduced into a "pill-type" kneading machine which comprises a granulating disk or drum whose axis forms an angle of approx. 30 to 60° with the horizontal and which swings slowly about this axis. The alkaline solution is simultaneously supplied to the kneading machine in an amount which, in relation to the mixture, essentially corresponds to that indicated above.
Som eksempel kan nevnes at for en omtrent homogen blanding av aluminiumoksyd og kullstoff der korndimensjonen er mindre enn 150 |x og en knamaskin som er 2 m i diameter, 80 cm dyp og ligger i 30° til horisontalen og med omdreiningstall på As an example, it can be mentioned that for an approximately homogeneous mixture of aluminum oxide and carbon material where the grain size is less than 150 |x and a kneader that is 2 m in diameter, 80 cm deep and located at 30° to the horizontal and with a speed of
16 pr. minutt er oppholdstidene av stør-relsesordenen: — fra ca. 1 til 3 timer for å oppnå korn med en diameter på ca. 10 mm. — fra ca. 1 til 4 timer for å oppnå korn med en diameter på ca. 15 mm. — fra ca. 1 til 6 timer for å oppnå korn med en diameter på ca. 20 mm. 16 per minutes, the residence times are of the order of magnitude: — from approx. 1 to 3 hours to obtain grains with a diameter of approx. 10 mm. — from approx. 1 to 4 hours to obtain grains with a diameter of approx. 15 mm. — from approx. 1 to 6 hours to obtain grains with a diameter of approx. 20 mm.
Kornene i den agglomererte deigen blir så tørket ved å varmes opp til en temperatur på f. eks. mellom 100° og 200° C fortrinsvis ved vanlig trykk eller eventuelt ved et mer eller mindre redusert trykk. The grains in the agglomerated dough are then dried by heating to a temperature of e.g. between 100° and 200° C preferably at normal pressure or possibly at a more or less reduced pressure.
Briketter som oppnås på denne måten viser en utmerket mekanisk slitestyrke og kan også tåle loddrette krefter på ca. 60 til 110 kg ved vanlige temperaturer uten å bli knust. Briquettes obtained in this way show excellent mechanical wear resistance and can also withstand vertical forces of approx. 60 to 110 kg at normal temperatures without being crushed.
Slike briketter kan blant annet brukes i enhver kjemisk prosess som omfatter en fase hvor aluminiumoksyd reduseres med kullstoff, slik som f. eks. ved fremstilling av aluminiumnitrid, aluminiumkar-bid, aluminiumhalogenid osv. Brikettene har videre den store fordel at de ikke innfører forurensninger når de brukes. Ved nitrering av slike briketter med nitrogen kan det direkte oppnås briketter som inneholder ca. 98,5 pst. eller mer aluminiumnitrid, ved å benytte vandige mettede oppløsninger av natriumaluminat som etsalkalilut. Such briquettes can, among other things, be used in any chemical process that includes a phase where aluminum oxide is reduced with carbon, such as e.g. in the production of aluminum nitride, aluminum carbide, aluminum halide, etc. The briquettes also have the great advantage that they do not introduce contaminants when they are used. By nitriding such briquettes with nitrogen, briquettes containing approx. 98.5 per cent or more aluminum nitride, by using aqueous saturated solutions of sodium aluminate as eth-alkali solution.
Følgende eksempler er gitt for å illu-strere de forskjellige trekk ved fremgangsmåten i henhold til oppfinnelsen og skal ikke på noen måte virke begrensende. The following examples are given to illustrate the various features of the method according to the invention and shall not be limiting in any way.
Eksempel 1. Example 1.
100 kg aluminiumoksyd i form av opp-blåst korund og 47 kg ren, brent petro-leumskoks, begge i pulverform med korn-dimensjon under 150 \ i, ble intimt blandet ved knaing i ca. l/ 2 time. 100 kg of alumina in the form of blown corundum and 47 kg of pure, burnt petroleum coke, both in powder form with a grain size of less than 150 µm, were intimately mixed by kneading for approx. l/ 2 hours.
Den oppnådde blanding ble kontinuerlig ført til en granuleringsskive som tid-ligere beskrevet ved hjelp av f. eks. en re-gulerbar rysteledning med en hastighet på ca. 50 kg blanding pr. time. The obtained mixture was continuously fed to a granulation disk as previously described by means of e.g. an adjustable vibrating wire with a speed of approx. 50 kg mixture per hour.
En vandig oppløsning av natriumaluminat ble også tilført kontinuerlig ved hjelp av en doseringspumpe i en mengde på ca. 5,5 liter pr. time. Oppløsningen hadde en egenvekt på ca. 1,45 og inneholdt ca. 237 g Al2Os pr. liter ca. 261 g Na26 pr. liter. Blandingen sammen med oppløsningen ble på denne måten rørt kontinuerlig i ca. 2y2 time, og det tas kontinuerlig ut kule-f orme te deigkorn med gjennomsnittlig egenvekt på ca. 1,35 og en diameter på ca. 15 mm. Kornene ble tørket i 10 timer ved en temperatur på 170° C. Briketter oppnådd på denne måten hadde en gjennomsnittlig egenvekt på ca. 1,23 og inneholdt mindre enn 0,5 vektprosent vann. An aqueous solution of sodium aluminate was also added continuously by means of a dosing pump in an amount of approx. 5.5 liters per hour. The solution had a specific gravity of approx. 1.45 and contained approx. 237 g Al2Os per liters approx. 261 g Na26 per litres. The mixture together with the solution was stirred continuously in this way for approx. 2y2 hours, and ball-shaped dough grains with an average specific gravity of approx. 1.35 and a diameter of approx. 15 mm. The grains were dried for 10 hours at a temperature of 170° C. Briquettes obtained in this way had an average specific gravity of approx. 1.23 and contained less than 0.5% by weight of water.
Eksempel 2. Example 2.
Under nøyaktig samme arbeidsforhold som i eksempel 1 ble det behandlet 50 kg pr. time av en blanding av aluminiumoksyd og kullstoff i likhet med den som ble behandlet i eksempel 1 sammen med ca. 5 liter pr. time av en vandig oppløsning som inneholdt 400 g kaustisk soda pr. liter. Under exactly the same working conditions as in example 1, 50 kg per hour of a mixture of aluminum oxide and carbon similar to that which was treated in example 1 together with approx. 5 liters per hour of an aqueous solution containing 400 g of caustic soda per litres.
På denne måte ble det oppnådd briketter som var meget nær lik de som ble oppnådd i eksempel 1. In this way, briquettes were obtained which were very close to those obtained in example 1.
Claims (2)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7209009A SE371756B (en) | 1972-07-07 | 1972-07-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NO137228B true NO137228B (en) | 1977-10-17 |
| NO137228C NO137228C (en) | 1978-01-25 |
Family
ID=20275594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO2783/73A NO137228C (en) | 1972-07-07 | 1973-07-06 | COMPOSED ROLLER. |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US3842471A (en) |
| CA (1) | CA982374A (en) |
| CS (1) | CS179987B2 (en) |
| DD (1) | DD106787A5 (en) |
| DE (1) | DE2334212A1 (en) |
| ES (1) | ES416689A1 (en) |
| FR (1) | FR2191949B1 (en) |
| GB (1) | GB1438510A (en) |
| IT (1) | IT990895B (en) |
| NO (1) | NO137228C (en) |
| PL (1) | PL85630B1 (en) |
| SE (1) | SE371756B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT327140B (en) * | 1974-05-20 | 1976-01-12 | Plansee Metallwerk | ROLLERS EQUIPPED WITH CARBIDE OR COMPLETE FROM CARBIDE, AND THE PROCESS FOR THEIR PRODUCTION |
| US3953914A (en) * | 1974-08-02 | 1976-05-04 | Kennametal Inc. | Mounting arrangement |
| SE380450B (en) * | 1975-01-31 | 1975-11-10 | Seco Tools Ab | COMPOSITE ROLL |
| DE2636199A1 (en) * | 1976-08-09 | 1978-02-16 | Mannesmann Ag | PROCESS FOR THE MANUFACTURING OF TREATED ROLLS FOR CONTINUOUS CASTING PLANTS |
| JPS59197307A (en) * | 1983-04-22 | 1984-11-08 | Hitachi Ltd | Roll for rolling mill |
| US4866968A (en) * | 1987-06-17 | 1989-09-19 | Westinghouse Electric Corp. | High strength cemented carbide dies and mandrels for a pilgering machine |
| JPS645702U (en) * | 1987-06-27 | 1989-01-13 | ||
| US5290507A (en) * | 1991-02-19 | 1994-03-01 | Runkle Joseph C | Method for making tool steel with high thermal fatigue resistance |
| JPH05154514A (en) * | 1991-12-05 | 1993-06-22 | Sumitomo Metal Ind Ltd | Grooved roll for rolling and manufacture of its roll body |
| DE602006006111D1 (en) * | 2005-06-17 | 2009-05-20 | Sandvik Intellectual Property | roller |
| SE528850C2 (en) * | 2005-06-17 | 2007-02-27 | Sandvik Intellectual Property | Roller and spacer ring with power transmitting end surface |
| CN109759450A (en) * | 2018-12-26 | 2019-05-17 | 中钢集团邢台机械轧辊有限公司 | A kind of combination roller and its manufacturing method for steel rolling |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2342159A (en) * | 1940-04-01 | 1944-02-22 | Francis D Moran | Composite roll |
| SE346915B (en) * | 1967-09-18 | 1972-07-24 | Sandvikens Jernverks Ab | |
| GB1298065A (en) * | 1968-12-10 | 1972-11-29 | British Iron Steel Research | Rolling mill work roll assemblies |
| DE1818016A1 (en) * | 1968-12-19 | 1977-05-18 | Hufnagl Walter | ROLL FOR COLD FORMING OF ROLLED WIRE |
| US3577619A (en) * | 1969-05-12 | 1971-05-04 | Sandvikens Jernverks Ab | Method of manufacturing composite hardmetal rolls |
-
1972
- 1972-07-07 SE SE7209009A patent/SE371756B/xx unknown
-
1973
- 1973-07-03 IT IT26143/73A patent/IT990895B/en active
- 1973-07-05 DE DE19732334212 patent/DE2334212A1/en active Pending
- 1973-07-06 DD DD172121A patent/DD106787A5/xx unknown
- 1973-07-06 NO NO2783/73A patent/NO137228C/en unknown
- 1973-07-06 CS CS7300004908A patent/CS179987B2/en unknown
- 1973-07-06 ES ES416689A patent/ES416689A1/en not_active Expired
- 1973-07-06 FR FR7324854A patent/FR2191949B1/fr not_active Expired
- 1973-07-06 CA CA175,861A patent/CA982374A/en not_active Expired
- 1973-07-07 PL PL1973163899A patent/PL85630B1/pl unknown
- 1973-07-09 GB GB3254173A patent/GB1438510A/en not_active Expired
- 1973-07-09 US US00377459A patent/US3842471A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| SE371756B (en) | 1974-12-02 |
| FR2191949B1 (en) | 1978-07-21 |
| DE2334212A1 (en) | 1974-01-24 |
| IT990895B (en) | 1975-07-10 |
| US3842471A (en) | 1974-10-22 |
| CA982374A (en) | 1976-01-27 |
| FR2191949A1 (en) | 1974-02-08 |
| NO137228C (en) | 1978-01-25 |
| DD106787A5 (en) | 1974-07-05 |
| CS179987B2 (en) | 1977-12-30 |
| ES416689A1 (en) | 1976-06-01 |
| GB1438510A (en) | 1976-06-09 |
| PL85630B1 (en) | 1976-04-30 |
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