FI71880B - Dimensionsstabil filterkonstruktion samt foerfarande foer dessframstaellning - Google Patents

Dimensionsstabil filterkonstruktion samt foerfarande foer dessframstaellning Download PDF

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Publication number
FI71880B
FI71880B FI790447A FI790447A FI71880B FI 71880 B FI71880 B FI 71880B FI 790447 A FI790447 A FI 790447A FI 790447 A FI790447 A FI 790447A FI 71880 B FI71880 B FI 71880B
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Finland
Prior art keywords
filter
fibers
filter layer
high temperatures
trees
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FI790447A
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English (en)
Finnish (fi)
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FI790447A (fi
FI71880C (sv
Inventor
Leonard Robert Lefkowitz
Wollert Henrik Krohn
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Huyck Corp
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Publication of FI790447A publication Critical patent/FI790447A/fi
Publication of FI71880B publication Critical patent/FI71880B/fi
Application granted granted Critical
Publication of FI71880C publication Critical patent/FI71880C/sv

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022—Non-woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/06—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer characterised by a fibrous or filamentary layer mechanically connected, e.g. by needling to another layer, e.g. of fibres, of paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/005—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising one layer of ceramic material, e.g. porcelain, ceramic tile
    • B32B9/007—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising one layer of ceramic material, e.g. porcelain, ceramic tile comprising carbon, e.g. graphite, composite carbon
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B21/00—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
    • D04B21/14—Fabrics characterised by the incorporation by knitting, in one or more thread, fleece, or fabric layers, of reinforcing, binding, or decorative threads; Fabrics incorporating small auxiliary elements, e.g. for decorative purposes
    • D04B21/16—Fabrics characterised by the incorporation by knitting, in one or more thread, fleece, or fabric layers, of reinforcing, binding, or decorative threads; Fabrics incorporating small auxiliary elements, e.g. for decorative purposes incorporating synthetic threads
    • D04B21/165—Fabrics characterised by the incorporation by knitting, in one or more thread, fleece, or fabric layers, of reinforcing, binding, or decorative threads; Fabrics incorporating small auxiliary elements, e.g. for decorative purposes incorporating synthetic threads with yarns stitched through one or more layers or tows, e.g. stitch-bonded fabrics
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/52—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by applying or inserting filamentary binding elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
    • F01N3/0226—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being fibrous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/101—Glass fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/106—Carbon fibres, e.g. graphite fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/10—Fibres of continuous length
    • B32B2305/20—Fibres of continuous length in the form of a non-woven mat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/38—Meshes, lattices or nets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2101/00—Inorganic fibres
    • D10B2101/20—Metallic fibres
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2505/00—Industrial
    • D10B2505/04—Filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/10—Fibrous material, e.g. mineral or metallic wool
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00—Gas separation
    • Y10S55/05—Methods of making filter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00—Gas separation
    • Y10S55/43—Knitted filter mediums

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Textile Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Filtering Materials (AREA)

Claims (30)

1. Dimensionsstabi1 fi1terkonstruktion (1) som är avsedd för avlägsnande av främmande och finfördelat material ur fluider vid en hög temperatur, kännetecknad av att filterkons-truktionen (1) omfattar ätminstone ett filterlager (2, 6) av relativt sköra, höga temperaturer och korrosion motstäende fibrer, varvid fibrerna är valda av gruppen bestäende av glas-fibrer, kvartsfibrer, keramfibrer, kolfibrer och grafitfibrer, och lagret är stickat med höga temperaturer och korrosion motstäende trädar (3-5) sä att filterlagret är i fi1terkonstruk-tionen inkapslad mellan tvä av nämnda trädar stickade yttre skikt och nämnda yttre skikt är förbundna med varandra vid ett flertal genomgängspunkter i filterlagret.
2. Fi1terkonstruktion enligt patentkrav 1, kännetecknad av att nämnda höga temperaturer och korrosion motstäende trädar (3-5) utgöres av metall-monofilaraenttradar.
3. Filterkonstruktion enligt patentkrav 1, k ä n n e t e c k-n a d av att nämnda höga temperaturer och korrosion motstäende trädar (3-5) utgöres av multi-filament-metai1trädar eller glas-trädar.
4. Filterkonstruktion enligt patentkrav 3, kännetecknad av att den omfattar ett organ (5b, 7), som uppbär filter lagret (2, 6) under stickning och utgör en del av filterkon-s truk t ionen (1).
5. Filterkonstruktion enligt patentkrav 4, kännetecknad av att nämnda stödorgan utgörs av ett med maskor utfört vävt nät (5b) av fibrer som utstär höga temperaturer och korro-s i on.
6. Filterkonstruktion enligt patentkrav 4, kännetecknad av att nämnda stödorgan utgörs av ett icke-vävt under-lag (7).
7. Filterkonstruktion enligt patentkrav 1, kännetecknad av att fi1terkonstruktionen (1) innefattar 2i 71880 ätminstone tvä filterlager (6, 7) stickade av nämnda tra der (3-5) soin motstär höga temperaturer och korrosion.
8. Filterkonstruktion enligt patentkrav 7, känneteck-n a d av att ett (6) av nämnda filterlager bestär av fibrer med en diameter av upp tili ca. 10pm och att den andra (7) av nämnda filterlager tjänar sasom ett understödjande underlag och bestir av fibrer med en diameter av upp tili ca. 50 pm.
9. Filterkonstruktion enligt patentkrav 1, känneteck-n a d av att den omfattar ett organ (5b, 7), som uppbär filter-lagret (2, 6) under stickning och utgör en del av filterkons-truktionen (1).
10. Filterkonstruktion enligt patentkrav 9, kanne- tecknad av att nämnda stödorgan utgörs av ett icke-vävt under1ag (7).
11. Filterkonstruktion enligt patentkrav 9, k ä n n e- tecknadav att nämnda stödorgan utgörs av ett med maskor utfört vävt nät (5b) av fibrer som utstar höga temperaturer och korrosion.
12. Filterkonstruktion enligt patentkrav 1, kanne- tecknad av att sma hai i konstruktionen (1) vid nämnda genomgangspunkter är tillslutna.
13. Filterkonstruktion enligt patentkrav 12, känneteck-n a d av att hälen vid genomgängspunkterna har tillslutits med sintrade partiklar som fyller ut hilen.
14. Filterkonstruktion enligt patentkrav 1, k ä n n e- tecknad av att iKonstruktionen (1) ingär raka tradar (8), som motstir höga temperaturer och korrosion och som sträcker sig i konstruktionens maskinriktning som är den riktning i vilken filterlagret (2) rör sig under stickningen.
15. Filterkonstruktion enligt patentkrav 1, k ä n n e- tecknadav att konstruktionen (1) är veckad. 22 718 80
16. Förfarande för framställning av en dimensionsstabi1 fiber- konstruktion (1) enligt nägot av den föregäende patenkraven, vilken konstruktion är avsedd för avlägsnande av främmande och finfördelat material ur fluider vid en hög temperatur, k ä n -netecknatav att av relativt sköra, höga temperaturer och korrosion motstäende fibrer, vilka är valda av gruppen som bestar av S^asfibrer, kvartsfibrer, keramfibrer, kolfibrer och grafitfibrer, utformas ätminstone ett filterlager (2, 6) som stickas med höga temperaturer och korrosion motstäende trä-dar (3-5) sä att filterlagret inkapslas mellan tvä av nämnda trädar stickade yttre skikt och nämnda yttre skikt blir förbund-na med varandra vid ett flertal genomgängspunkter i filterlagret .
17. Förfarande enligt patentkrav 16, känne tecknatav att som nämnda höga temperaturer och korrosion motstäende trädar (3-5) används meta11-monofilamentträdar.
18. Förfarande enligt patentkrav 16, k ä n n e t e c k n a t av att som nämnda höga temperaturer och korrosion motstäende trädar (3-5) används multifi1ament-metai1iträdar eller glasträdar.
19. Förfarande enligt patentkrav 16, kännetecknatav att ätminstone tvä filterlager (6, 7) placeras over varandra och stickas med nämnda höga temperaturer och korrosion motstäende trädar (3-5).
20. Förfarande enligt patentkrav 16, kännetecknatav att nämnda filterlager (6, 7) förstärks.
21. Förfarande enligt patentkrav 20, kännetecknatav att filterlagret (6) förstärks genom nälning.
22- Förfarande enligt patentkrav 20, kännetecknatav att filterlagret (6) förstärks genom nälning vid ett icke-vävt underlag (7).
FI790447A 1978-02-14 1979-02-09 Dimensionsstabil filterkonstruktion samt förfarande för dess framställ ning. FI71880C (sv)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US05/877,706 US4181514A (en) 1978-02-14 1978-02-14 Stitch knitted filters for high temperature fluids and method of making them
US87770678 1978-02-14

Publications (3)

Publication Number Publication Date
FI790447A FI790447A (fi) 1979-08-14
FI71880B true FI71880B (fi) 1986-11-28
FI71880C FI71880C (sv) 1987-03-09

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ID=25370551

Family Applications (1)

Application Number Title Priority Date Filing Date
FI790447A FI71880C (sv) 1978-02-14 1979-02-09 Dimensionsstabil filterkonstruktion samt förfarande för dess framställ ning.

Country Status (11)

Country Link
US (1) US4181514A (sv)
JP (2) JPS54119173A (sv)
AR (1) AR219579A1 (sv)
AU (1) AU4419379A (sv)
BR (1) BR7900885A (sv)
CA (1) CA1117443A (sv)
DE (1) DE2905485A1 (sv)
FI (1) FI71880C (sv)
FR (1) FR2416715A1 (sv)
GB (1) GB2017180B (sv)
SE (1) SE439884B (sv)

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JPS58166822U (ja) 1983-11-07
GB2017180A (en) 1979-10-03
AR219579A1 (es) 1980-08-29
US4181514A (en) 1980-01-01
JPS6192Y2 (sv) 1986-01-07
FI790447A (fi) 1979-08-14
JPS54119173A (en) 1979-09-14
DE2905485A1 (de) 1980-01-17
SE439884B (sv) 1985-07-08
FR2416715A1 (fr) 1979-09-07
CA1117443A (en) 1982-02-02
BR7900885A (pt) 1979-09-11
FR2416715B1 (sv) 1984-11-23
AU4419379A (en) 1979-08-23
SE7901277L (sv) 1979-10-15
GB2017180B (en) 1982-08-18
FI71880C (sv) 1987-03-09

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