NO124044B - - Google Patents
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- Publication number
- NO124044B NO124044B NO4026/68A NO402668A NO124044B NO 124044 B NO124044 B NO 124044B NO 4026/68 A NO4026/68 A NO 4026/68A NO 402668 A NO402668 A NO 402668A NO 124044 B NO124044 B NO 124044B
- Authority
- NO
- Norway
- Prior art keywords
- hexagonal
- friction
- alloyed
- coating according
- cobalt
- Prior art date
Links
- 238000000576 coating method Methods 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 239000011733 molybdenum Substances 0.000 claims description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 4
- 229910052721 tungsten Inorganic materials 0.000 claims description 4
- 239000010937 tungsten Substances 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052779 Neodymium Inorganic materials 0.000 claims description 2
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims description 2
- 229910052790 beryllium Inorganic materials 0.000 claims description 2
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 239000011651 chromium Substances 0.000 claims description 2
- 229910000423 chromium oxide Inorganic materials 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 claims description 2
- 229910052727 yttrium Inorganic materials 0.000 claims description 2
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims description 2
- 239000010941 cobalt Substances 0.000 claims 3
- 229910017052 cobalt Inorganic materials 0.000 claims 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims 3
- 150000001722 carbon compounds Chemical class 0.000 claims 2
- 239000013078 crystal Substances 0.000 description 10
- 239000002783 friction material Substances 0.000 description 7
- 239000000314 lubricant Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910000531 Co alloy Inorganic materials 0.000 description 2
- 229910039444 MoC Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- QIJNJJZPYXGIQM-UHFFFAOYSA-N 1lambda4,2lambda4-dimolybdacyclopropa-1,2,3-triene Chemical compound [Mo]=C=[Mo] QIJNJJZPYXGIQM-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910020042 NbS2 Inorganic materials 0.000 description 1
- 229910052772 Samarium Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000005291 magnetic effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052961 molybdenite Inorganic materials 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229910052702 rhenium Inorganic materials 0.000 description 1
- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 description 1
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Composition of linings ; Methods of manufacturing
- F16D69/027—Compositions based on metals or inorganic oxides
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/134—Plasma spraying
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/02—Braking members; Mounting thereof
- F16D65/12—Discs; Drums for disc brakes
- F16D65/127—Discs; Drums for disc brakes characterised by properties of the disc surface; Discs lined with friction material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/04—Attachment of linings
- F16D2069/0425—Attachment methods or devices
- F16D2069/0491—Tools, machines, processes
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- Physics & Mathematics (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Braking Arrangements (AREA)
- Mechanical Operated Clutches (AREA)
Description
Friksjonsbelegg for deler til bremser eller elektromagnetiske koplinger. Friction coating for parts for brakes or electromagnetic couplings.
Foreliggende.oppfinnelse angår friksjonsbelegg og det er en hensikt med foreliggende oppfinnelse, å skaffe et friksjonsbelegg som har stabile og ensartede friksjonségenskaper innen bestemte grenser for temperaturer. : Ifølge foreliggende oppfinnelse skaffes et friksjonsbelegg, særlig egnet for clutcher og bremser som i det vesentlige består av plasma-avsatt- lag av et materiale isom krystalliserer i det hexagonale system. For at foreliggende oppfinnelse skal forstås lettere, vil .. det i det følgende beskrives friksjonsbelegg. ifølge, foreliggende oppfinnelse. '.. v V ■■>. Det er blitt funnet at materialer som har en hexagonal krystallstruktur har meget stabile friksjonségenskaper. For eksempel har forsøk vist at et element som kan krystallisere, i to allotropiske former, d.v.s. enten hexagonal eller kubiske krystaller, har de mest stabile friksjonsegenskaper når de krystalliserer i det hexagonale system. Det er også blitt funnet at et egnet hexagonalt krystallisert lag tilfredsstillende.og med fordel kan påføres en overflate ved hjelp av en plasmaavsetning ved hjelp av plasmastråle. The present invention relates to friction coatings and it is a purpose of the present invention to provide a friction coating which has stable and uniform friction properties within certain temperature limits. : According to the present invention, a friction coating is obtained, particularly suitable for clutches and brakes, which essentially consists of a plasma deposit layer of a material that crystallizes in the hexagonal system. In order for the present invention to be understood more easily, .. friction coating is described below. according to the present invention. '.. v V ■■>. It has been found that materials having a hexagonal crystal structure have very stable frictional properties. For example, experiments have shown that an element that can crystallize, in two allotropic forms, i.e. either hexagonal or cubic crystals, they have the most stable frictional properties when they crystallize in the hexagonal system. It has also been found that a suitable hexagonal crystallized layer can be satisfactorily and advantageously applied to a surface by means of plasma deposition by means of a plasma jet.
Et materiale for friksjonsbelegg ifølge foreliggende oppfinnelse, velgés således med hexagonal krystallstruktur ved arbeidstemperaturer og er plasmaavsatt. A material for friction coating according to the present invention is thus selected with a hexagonal crystal structure at working temperatures and is plasma deposited.
Idet det antas i en hexagonal krystall at a er den avstand som atskiller naboatomer i samme hexagonale plan og c er den avstand som atskiller to naboatomer fra 'et av de., to hexagonale plan til Since it is assumed in a hexagonal crystal that a is the distance that separates neighboring atoms in the same hexagonal plane and c is the distance that separates two neighboring atoms from one of the two hexagonal planes to
det annet, blir gitterforholdet definert _c . Dessuten, idet det antas at i den idealtilstand hvor de atomer som går inn i sammen-setningen av krystallet opptar rom, kan det vises at for en ideell kompakt lagring av atomene- i= den hexagonale -krystall blir: the second, the lattice ratio is defined _c . Moreover, assuming that in the ideal state where the atoms that enter the composition of the crystal occupy space, it can be shown that for an ideal compact storage of the atoms - in = the hexagonal -crystal becomes:
Det er nå blitt funnet ved-hjelp av forsøk at de legemer som har de beste friksjonsegenskaper, d.v.s. jevnhet med foranderlig belastning og den laveste risiko for fast grep er slike som under friksjonen er tilstede i form av hexagonale krystaller hvis gitterforhold er så nær som mulig det ideelle tilfelle hvor _c _ -, /-QQ It has now been found by means of experiments that the bodies which have the best frictional properties, i.e. smoothness with changing load and the lowest risk of sticking are those which during friction are present in the form of hexagonal crystals whose lattice ratio is as close as possible to the ideal case where _c _ -, /-QQ
a J-°3J • For mange elementer som ved omgivende temperatur har en hexagonal krystallinsk struktur, omdannes den hexagonale struktur ved en viss temperatur til en kubisk struktur .som gjør at. friksjonsmaterialet kleber og er uegnet for sitt formål. a J-°3J • For many elements which at ambient temperature have a hexagonal crystalline structure, the hexagonal structure is converted at a certain temperature into a cubic structure, which means that. the friction material sticks and is unsuitable for its purpose.
Tar man dette i betraktning velges bestanddelene i friksjons-materialer fra slike.som krystalliserer i hexagonale krystaller, og mere spesielt slike .som synes mest gunstige på grunn av deres gitterforhold _c , deres høye allotropiske qvergangstemperatur og Taking this into account, the components of friction materials are chosen from those that crystallize in hexagonal crystals, and more particularly those that seem most favorable because of their lattice ratio _c , their high allotropic transition temperature and
a a
om nødvendig deres spesifikke magnetiske egenskaper eller slike; if necessary, their specific magnetic properties or such;
som de kan gi en legering.eller kombinasjon ved deltagelse i dette. which they can give an alloy.or combination by participating in this.
Materialer som-er særlig:fordelaktige fra-disse synspunkter vil fremgå av følgende tabell. Materials which are particularly advantageous from these points of view will appear in the following table.
Elementene i ovenstående tabell kan være tilstede i friksjonsmateriale i ren tilstand. Hvert av disse elementer kan også legeres med ett eller flere andre elementer som er angitt i tabellen eller også med ett eller flere metaller, oksyder eller karbider som i seg selv ikke har en hexagonal struktur, i den ut-strekning hvor allikevel den hexagonale struktur for ovennevnte element bibeholdes i de dannede legeringer. Eksempler på slike ikke hexagonale metaller er krom,, lantan, molybden, renium, samarium, wolfram, aluminium, kopper, jern, nikkel, niob. Eksempler på de nevnte karbider er TaC, TiC, MoC, WC,- Cr^Cg, Cr^O^ som er representativ for de nevnte oksyder. Molybdenkarbidet var ikke homogent, men inneholdt ekvimolare mengder molybden og karbon. Koboltlegeringer har særlig fordelaktige egenskaper, f.eks» koboltlegeringer som inneholder wolfram, wolframkarbid, kromoksyd, yttrium eller neodym eller molybden eller beryllium. The elements in the above table may be present in friction material in its pure state. Each of these elements can also be alloyed with one or more other elements that are indicated in the table or also with one or more metals, oxides or carbides which in themselves do not have a hexagonal structure, to the extent that the hexagonal structure for the above element is retained in the alloys formed. Examples of such non-hexagonal metals are chromium, lanthanum, molybdenum, rhenium, samarium, tungsten, aluminium, copper, iron, nickel, niobium. Examples of the carbides mentioned are TaC, TiC, MoC, WC, - Cr^Cg, Cr^O^ which are representative of the mentioned oxides. The molybdenum carbide was not homogeneous, but contained equimolar amounts of molybdenum and carbon. Cobalt alloys have particularly advantageous properties, eg cobalt alloys containing tungsten, tungsten carbide, chromium oxide, yttrium or neodymium or molybdenum or beryllium.
I en bestanddel av friksjonsmaterialet kan gitterforholdet In a component of the friction material, the lattice ratio can
_c forbedres og/eller den allotropiske overgangstemperatur for de a _c is improved and/or the allotropic transition temperature for the a
hexagonale krystaller til kubiske krystaller kan heves ved en til-setning av erstatningsatomer etterfulgt om nødvendig av en egnet utglødning, slik at den krevede hexagonale krystallinske struktur kan bevares enda under operasjon ved forhøyede temperaturer, og Curie-punktet for friksjonsmaterialet kan også heves. For å bedre friksjonsegenskapene f.eks. stabilitet for det porøse friksjonsmateriale kan det inkorporeres et fast smøremiddel, slik som grafitt, MoS2, CaF, BaF, NbS2, WSg. hexagonal crystals to cubic crystals can be raised by an addition of replacement atoms followed, if necessary, by a suitable annealing, so that the required hexagonal crystalline structure can be preserved even during operation at elevated temperatures, and the Curie point of the friction material can also be raised. To improve the friction properties, e.g. stability of the porous friction material, a solid lubricant can be incorporated, such as graphite, MoS2, CaF, BaF, NbS2, WSg.
For å inkorporere fast smøremiddel på denne måte kan det porøse friksjonsmateriale impregneres i vakuum med en suspensjon av det faste smøremiddel i en væske eller en epoksyharpiks. Friksjonsbelegget ifølge foreliggende oppfinnelse kan på-føres skiver for bruk i elektromagnetiske bremser eller clutcher og blir derfor fortrinnsvis fremstilt av et ferromagnetisk materiale som er porøst, fortrinnsvis mikroporøst.. To incorporate solid lubricant in this way, the porous friction material can be impregnated in vacuum with a suspension of the solid lubricant in a liquid or an epoxy resin. The friction coating according to the present invention can be applied to disks for use in electromagnetic brakes or clutches and is therefore preferably produced from a ferromagnetic material which is porous, preferably microporous.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR124111A FR1567919A (en) | 1967-10-11 | 1967-10-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
NO124044B true NO124044B (en) | 1972-02-21 |
Family
ID=8639926
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NO4026/68A NO124044B (en) | 1967-10-11 | 1968-10-10 |
Country Status (12)
Country | Link |
---|---|
AT (1) | AT315592B (en) |
CH (1) | CH512023A (en) |
DE (1) | DE1802377A1 (en) |
DK (1) | DK126271B (en) |
ES (1) | ES358908A1 (en) |
FR (1) | FR1567919A (en) |
GB (1) | GB1248057A (en) |
IL (1) | IL30839A (en) |
LU (1) | LU57023A1 (en) |
NL (1) | NL6814429A (en) |
NO (1) | NO124044B (en) |
SE (1) | SE352711B (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2166949C3 (en) * | 1967-10-11 | 1982-03-11 | Centre National de la Recherche Scientifique, 75007 Paris | Friction block for an electromagnetically operated brake or clutch |
DE2911875A1 (en) * | 1979-03-26 | 1981-02-26 | Softline Ag | HANGING DEVICE FOR A SLIDING WALL PANEL OF A SLIDING PARTITION |
DE3910046A1 (en) * | 1989-03-28 | 1990-10-04 | Binder Magnete | Electromagnetically actuated coupling |
ES2113379T3 (en) * | 1990-09-14 | 1998-05-01 | Martin John Michael Murphy | BRAKE DISC OR SIMILAR COMPONENT CONSISTING OF A MATERIAL MADE OF METALLIC MATRIX. |
JP3114045B2 (en) * | 1994-03-16 | 2000-12-04 | 株式会社日立製作所 | Emergency stop device and elevator for elevator |
DE10115756B4 (en) * | 2001-03-23 | 2015-03-05 | Bellheimer Metallwerk Gmbh | storage lift |
DE102006007688B4 (en) * | 2006-02-20 | 2016-10-13 | Kern Antriebstechnik GmbH | Electromagnetically operated switching unit |
CN112063953B (en) * | 2020-09-11 | 2021-09-03 | 昆明理工大学 | Thermal spraying high-temperature friction-resistance brake coating material and preparation method thereof |
-
1967
- 1967-10-11 FR FR124111A patent/FR1567919A/fr not_active Expired
-
1968
- 1968-10-03 LU LU57023A patent/LU57023A1/xx unknown
- 1968-10-04 CH CH1489368A patent/CH512023A/en not_active IP Right Cessation
- 1968-10-07 GB GB47470/68A patent/GB1248057A/en not_active Expired
- 1968-10-07 ES ES358908A patent/ES358908A1/en not_active Expired
- 1968-10-09 NL NL6814429A patent/NL6814429A/xx unknown
- 1968-10-09 SE SE13637/68A patent/SE352711B/xx unknown
- 1968-10-09 IL IL30839A patent/IL30839A/en unknown
- 1968-10-10 NO NO4026/68A patent/NO124044B/no unknown
- 1968-10-10 AT AT988368A patent/AT315592B/en not_active IP Right Cessation
- 1968-10-10 DE DE19681802377 patent/DE1802377A1/en active Pending
- 1968-10-10 DK DK489168AA patent/DK126271B/en unknown
Also Published As
Publication number | Publication date |
---|---|
ES358908A1 (en) | 1970-05-16 |
GB1248057A (en) | 1971-09-29 |
LU57023A1 (en) | 1969-01-20 |
FR1567919A (en) | 1969-05-23 |
DE1802377A1 (en) | 1969-08-14 |
IL30839A0 (en) | 1969-02-27 |
NL6814429A (en) | 1969-04-15 |
IL30839A (en) | 1972-11-28 |
DK126271B (en) | 1973-06-25 |
SE352711B (en) | 1973-01-08 |
AT315592B (en) | 1974-05-27 |
CH512023A (en) | 1971-08-31 |
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