DE2239404B2 - Soundproof glazing in the form of a layered body - Google Patents

Soundproof glazing in the form of a layered body

Info

Publication number
DE2239404B2
DE2239404B2 DE2239404A DE2239404A DE2239404B2 DE 2239404 B2 DE2239404 B2 DE 2239404B2 DE 2239404 A DE2239404 A DE 2239404A DE 2239404 A DE2239404 A DE 2239404A DE 2239404 B2 DE2239404 B2 DE 2239404B2
Authority
DE
Germany
Prior art keywords
glazing
plastic
parts
glass
space
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
DE2239404A
Other languages
German (de)
Other versions
DE2239404A1 (en
Inventor
Auf Nichtnennung Antrag
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FERAK BERLIN ERICH GRUENDEMANN 1000 BERLIN
Original Assignee
FERAK BERLIN ERICH GRUENDEMANN 1000 BERLIN
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FERAK BERLIN ERICH GRUENDEMANN 1000 BERLIN filed Critical FERAK BERLIN ERICH GRUENDEMANN 1000 BERLIN
Priority to DE2239404A priority Critical patent/DE2239404B2/en
Priority to CH973573A priority patent/CH574371A5/xx
Priority to IT69116/73A priority patent/IT996582B/en
Priority to BE134252A priority patent/BE803235A/en
Priority to NL7310812A priority patent/NL7310812A/xx
Priority to JP48088738A priority patent/JPS4959816A/ja
Priority to FR7328866A priority patent/FR2213162A1/en
Publication of DE2239404A1 publication Critical patent/DE2239404A1/en
Publication of DE2239404B2 publication Critical patent/DE2239404B2/en
Ceased legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B5/00—Doors, windows, or like closures for special purposes; Border constructions therefor
    • E06B5/20—Doors, windows, or like closures for special purposes; Border constructions therefor for insulation against noise
    • E06B5/205—Doors, windows, or like closures for special purposes; Border constructions therefor for insulation against noise windows therefor
    • 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
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10036—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets
    • 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
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
    • 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
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
    • B32B17/10798—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing silicone
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
    • C08K5/0025—Crosslinking or vulcanising agents; including accelerators
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C08L83/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/14—Polysiloxanes containing silicon bound to oxygen-containing groups
    • C08G77/16—Polysiloxanes containing silicon bound to oxygen-containing groups to hydroxyl groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/70—Siloxanes defined by use of the MDTQ nomenclature

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Joining Of Glass To Other Materials (AREA)
  • Securing Of Glass Panes Or The Like (AREA)

Description

gerade bedeckt Auf diese spiegelglatte Oberfläche wird nun nach Entlüftung der Masse unter schrägem Ansetzen, ruhend auf einem Weichgummiprofil, eine 2,8 mm starke Glasscheibe 4 so aufgesetzt, daß eine direkte Haftung zwischen dem Silikonkautschuk undjust covered On this mirror-smooth surface is now after deaeration of the mass under angled Apply, resting on a soft rubber profile, a 2.8 mm thick glass pane 4 placed so that a direct adhesion between the silicone rubber and

dem Glas erfolgt Nach etwa 24 Stunden bei Raumtemperatur ist diese Sihkonkautschukmasse so weit durchgehartet, daß zwischen den beiden Glasscheiben 2 und 4 ein gummielastischer transparenter Stoff ent-5 standen istthe glass takes place after about 24 hours at room temperature this silicon rubber compound is so far hardened that between the two panes of glass 2 and 4 a rubber-elastic transparent material ent-5 is standing

Hierzu I Blatt ZeichnungenFor this purpose I sheet drawings

Claims (2)

1 21 2 1500 mm und einer Tiefe \on 45 mm, wobei sich die1500 mm and a depth of 45 mm, whereby the Patentansprüche Schcibengroße auf eine Breite von 1560 mm und eineClaims Schcibengroße to a width of 1560 mm and one Hohe von 1310 mm belauft sowie der Scheibcnrah-Height of 1310 mm as well as the disc frame 1 Schalldammcnde Verglasung in Form eines men aus Holz besteht, die Dicke der ersten Glasscheibe Schichtkorpers der in einem Abstand /wci Glas- 5 2,8 mm, die Dicke der zweiten Glasscheibe 6,5 mm scheiben aufweist, die gegebenenfalls unterschied- und die Dicke der Kunststoffschicht sich auf 10,0 mm liehe Dicke besitzen, und bei dem der Zwischen- belauft, fuhrt zu einer mittleien Schalldammzahl raum mit elastischem Kunststoff gefüllt ist, von 40 dB1 soundproof glazing in the shape of a men made of wood, the thickness of the first pane of glass Laminated body of the at a distance / wci glass 5 2.8 mm, the thickness of the second glass sheet 6.5 mm Has disks, which may be different and the thickness of the plastic layer is 10.0 mm lent thickness, and at which the intermediate amount leads to a mean sound insulation number space is filled with elastic plastic, of 40 dB dadurch gekennzeichnet, daß der Es war nicht zu erwarten, daß der erfindungsgemaßcharacterized in that the It was not to be expected that the invention Kunststoff ein elastisch-plastischer kalthartender io in Anwendung kommende elastisch-plastische Silikon-Plastic an elastic-plastic cold-curing io elastic-plastic silicone- Sihkonkautschuk ist, der aus 100 Teilen n w- kautschuk in der Lage sein wurde, eine derartig guteSihkon rubber, which from 100 parts of n w rubber would be able to make such a good one Dihydroxydimcth)lpolysilo\an und 10 Teilen Di- Schalldammzahl zu ergeben Eine einwandfreie Er-Dihydroxydimcth) lpolysilo \ an and 10 parts of the sound insulation number to give a perfect result methylpolysiloxan bzw Meth>lphenylpolysiloxan klarung, worauf die gute Schalldämmung zuruck-methylpolysiloxane or meth> lphenylpolysiloxane clearing, whereupon the good sound insulation is und 10 Teilen eines Hartcrs besteht zufuhren ist, konnte bisher noch nicht gefundenand 10 parts of a hard crust has not yet been found 2 Schalldammende Verglasung räch Anspruch I, 15 werden2 soundproof glazing avenge claim I, 15 dadurch gekennzeichnet, daß der Zwischenraum Em we terer wesentlicher Vorteil der erfmdungs-characterized in that the space Em further essential advantage of the invention einc Breite von mindestens 10 mm hat gemäßen sohalldammenden Verglasung besteht dann,A width of at least 10 mm, there is adequate sound-absorbing glazing, daß eine praktisch zeitlich unbegrenzte, sehr hohethat a practically unlimited, very high UV-Festigkeit gegeben ist und «omit Verfärbungen,UV resistance is given and «omit discoloration, 20 ζ B in Form eines Vcrgilbens nicht eintreten Es20 ζ B in the form of a yellowing does not occur Es wurde weiterhin in überraschender Weise gefunden,was also found in a surprising way, und dies fuhrt zu einer preiswerten Massenfertigungand this leads to inexpensive mass production praktisch ohne Ausschuß, daß der erfindungsgemaß in Anwendung kommende Kunststoff bei der Härtungpractically without waste that the plastic used according to the invention during curing 25 nicht zur Schlierenbildung neigt, was bei anderen Kunststoffen der Fall ist, wodurch die Verwendung als Verglasung ausgeschlossen ist25 does not tend to form streaks, which is the case with others Plastics is the case, which eliminates the use as glazing is excluded Die Erfindung betrifft eine schalldammende Ver- Em Ausfuhrung=beispiel der Erfindung ist in derThe invention relates to a sound-absorbing embodiment = example of the invention is in the glasung in l-oim eines Schichtkorpers, der in einem Zeichnung dargestelltglazing in l-oim of a laminate, which is shown in a drawing Abstand 7v\ci Glasscheiben aufweist, die gegebenen- 30 Die schalldammende Verglasung 1 stellt einenDistance 7v \ ci glass panes, the given 30 The sound-absorbing glazing 1 represents a falls unterschiedliche Dicke besitzen, und bei dem der Schichtkörper dar, der sich zusammensetzt aus einerif have different thicknesses, and in which the laminated body is composed of one Zwischenraum mit elastischem Kunststoff gefüllt ist ersten Glasscheibe 2, einem mit Kunststoff gefülltenThe intermediate space filled with elastic plastic is first glass pane 2, one filled with plastic Verglasungen im Bausektor müssen unter den lieuti- Zwischenraum 3 sowie einer zweiten Glasscheibe 4Glazing in the building sector must be placed under the lieuti space 3 and a second pane of glass 4 gen Umweltbedingungen nicht nur Wärmeschutz und Die Glasscheiben 2 und 4 können unteischiedhcheThe glass panes 2 and 4 can differ in terms of environmental conditions eine ausreichende Beleuchtung der Räumlichkeiten 35 Dicke aufweisen, und die relativen Abmessungen deradequate lighting of the premises 35 thickness, and the relative dimensions of the durch Tageslicht erbringen, sondern sie sollen darüber drei Bestandteile des Schichtkorpers können innerhalbbring about by daylight, but they are supposed to be able to use three components of the laminate within hinaus auch wcitcstgehend schalldammcnd sein eines breiten Rahmens in Abhängigkeit von den vor-In addition, it should also be soundproofing as it grows within a broad framework, depending on the Schdlldammcnde Verglasungen, bei denen auf einem gegebenen Bedingungen abgeändert werden DerDamaging glazing, which can be modified on a given condition Rahmen zwei Glasscheiben, üblicherweise im Ab- Kunststoff fur den Zwischenraum 3 ist ein speziellerFrame two panes of glass, usually in the plastic for the space 3 is a special one standsvcrhaltnis von 12 mm zueinander, angeordnet 40 Silikonkautschuk, der gegen Alterung bestandig istRelative ratio of 12 mm to each other, arranged 40 silicone rubber, which is resistant to aging sind, ergeben im allgemeinen eine Schalldämmung bis und seine Elastizität innerhalb des auftretenden Tem-generally result in a sound insulation up to and its elasticity within the occurring temperature zu 28 dB peratiirbereichs von —40 bis 1-60°C beibehaltmaintains an operating range of -40 to 1-60 ° C to 28 dB Bei der eingangs beschriebenen, auf Grund des Die Herstellung eines einschlagigen Fensters erfolgtIn the case of the one described at the outset, the production of a single-impact window takes place deutschen Gebrauchmusters I 733 482 bekanntgewor- ζ B dergestaltet, daß von einem Holzrahmen mitGerman utility model I 733 482 known Gewor- ζ B in such a way that from a wooden frame with denen schalklammenden Verglasung mit ein- oder 45 einer Tiefe von 45 mm ausgegangen wird, der inner-for whom clamshell glazing with a depth of 45 mm or 45 mm is assumed, the inner mchrschichtiger Zwischenlage aus Kunststoff ist in«- halb des Rahmens mittig Auflage-Zapfen von 8 mmA multi-layer intermediate layer made of plastic is in «- half of the frame in the middle of a support pin of 8 mm besondere die Anwendung von Polyvinylchlorid- Tiefe und 10 mm Hohe besitzt Auf diese Zapfen wirdspecial the application of polyvinylchloride depth and 10 mm high possesses on these tenons Folien alsZwischenschiclUfullungcmpfohlen Derartige sodann zu beiden Seiten eine jeweils 1 mm starkeFoils as an intermediate layer are then recommended, each 1 mm thick on both sides schalldammende Vcrglasungen vermochten jedoch in Weichvollgummidichtung aufgebracht Unter Beruck-Sound-absorbing glazing, however, could be applied in a soft solid rubber seal. Bezug auf die Schalldämmung oder die Dauerhaftig- 50 sichtigung dieser jeweils 1 mm ergeben sich somitThis results in relation to the sound insulation or the permanent visibility of each 1 mm keit der Duichsichtigkeit nicht voll zu befriedigen 10 mm dicke Zapfen Auf der einen Seite diesesThe opacity of the opaqueness cannot be fully satisfied. 10 mm thick cones on one side of this Die einwandfreie Durchsichtigkeit ist durch Vergilben Zapfens wird auf der 1 mm starken Weichvollgummi-The flawless transparency is ensured by the yellowing of the cone on the 1 mm thick soft solid rubber dcr Kunstoffohe gefährdet Eine Schlierenbildung ist dichtung nun eine 6,5 mm starke Dickglasscheibe 2The plastic is endangered A streak formation is now sealed by a 6.5 mm thick thick glass pane 2 nicht auszuschließen angeklebt Der Rahmen mit der Glasscheibe 2 wirdnot ruled out glued The frame with the glass pane 2 is Der Erfindung hegt die Aufgabe zugrunde, eine 55 waagerecht gelagert Auf die Glasscheibe 2 wird derThe invention is based on the object of a 55 horizontally mounted schalldammcnde Verglasung mit hohem Schalldamm- Silikonkautschuk aufgebracht Der hier in AnwendungSoundproof glazing with high soundproof silicone rubber applied. The one in use here wert unter Vermeiden des geschuldet ten Nachteils zu kommende Silikonkautschuk wird hergestellt unterworth while avoiding the disadvantage owed to come silicone rubber is manufactured under schaffen Anwenden von 100 Teilen α,ω-Dihydroxypolydime-create using 100 parts of α, ω-dihydroxypolydime- Diese Aufgabe wird erfindungsgemaß dadurch ge- thylsiloxan niederen Polymerisationsgrades, denen zurAccording to the invention, this object is achieved by using thylsiloxane of a low degree of polymerization, which is used for lost, daß der Kunststoff ein elastisch-plastischer kalt- 60 Verbesserung der Elastizität 10 Teile Dimethylpoly-dissolves that the plastic is an elastic-plastic cold- 60 improvement in elasticity 10 parts dimethylpoly- hartender Silikonkautschuk i«t, der aus 100 Teilen siloxan bzw Methylphenylpolysiloxan unter entspre-hardening silicone rubber which is made from 100 parts of siloxane or methylphenylpolysiloxane with corresponding M/t)-DihydroxydimethylpoIysiloxan und 10 Teilen chendem Vermischen zugesetzt werden, bei mit einerM / t) -DihydroxydimethylpoIysiloxan and 10 parts of corresponding mixing are added at with a Diinethylpolysiloxan bzw Methylphenylpolysiloxan Viskosität von etwa 100 cSt In dieses Gemisch werdenDiinethylpolysiloxane or methylphenylpolysiloxane viscosity of about 100 cSt in this mixture und 10 Teilen eines Harters besteht sodann 10 Teile eines geeigneten Harters, ζ B Dibutyl-and 10 parts of a hardener then consists of 10 parts of a suitable hardener, ζ B dibutyl- Wie die praktische Erprobung gezeigt hat, wird bei 65 zinndioxid oder Dibutylzinnacetat oder Dibutylzinn-As practical testing has shown, tin dioxide or dibutyltin acetate or dibutyltin- dei erfmdungsgemaßen Verglasung eine hervorra- laurat usw als Hartungsmittel eingerührt Mit dieserthe glazing according to the invention an excellent laurate etc. as a hardening agent stirred in with this gende Schalldämmung erzielt Eine derartige Vergla- Masse wird der Raum zwischen den Zapfen so gefüllt,The space between the pegs is filled in such a way that such a glazing compound is sung mit einer Breite von 1750 mm, einer Hohe von daß das Gemisch die obere WeichgummidichtungSolution with a width of 1750 mm, a height of that the mixture the upper soft rubber seal
DE2239404A 1972-08-07 1972-08-07 Soundproof glazing in the form of a layered body Ceased DE2239404B2 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
DE2239404A DE2239404B2 (en) 1972-08-07 1972-08-07 Soundproof glazing in the form of a layered body
CH973573A CH574371A5 (en) 1972-08-07 1973-07-04
IT69116/73A IT996582B (en) 1972-08-07 1973-07-16 SOUND ABSORBING LAMINATED GLASS COMPLEX
BE134252A BE803235A (en) 1972-08-07 1973-08-06 LAMINATED SOUND INSULATION GLASS
NL7310812A NL7310812A (en) 1972-08-07 1973-08-06
JP48088738A JPS4959816A (en) 1972-08-07 1973-08-07
FR7328866A FR2213162A1 (en) 1972-08-07 1973-08-07 Acoustically insulated window - with two outer glass panes and inter layer of transparent silicone rubber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2239404A DE2239404B2 (en) 1972-08-07 1972-08-07 Soundproof glazing in the form of a layered body

Publications (2)

Publication Number Publication Date
DE2239404A1 DE2239404A1 (en) 1974-02-21
DE2239404B2 true DE2239404B2 (en) 1974-05-22

Family

ID=5853252

Family Applications (1)

Application Number Title Priority Date Filing Date
DE2239404A Ceased DE2239404B2 (en) 1972-08-07 1972-08-07 Soundproof glazing in the form of a layered body

Country Status (2)

Country Link
BE (1) BE803235A (en)
DE (1) DE2239404B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9061480B2 (en) * 2007-03-09 2015-06-23 Sabic Global Technologies B.V. Plastic laminates and methods for making the same

Also Published As

Publication number Publication date
BE803235A (en) 1973-12-03
DE2239404A1 (en) 1974-02-21

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