DE2220921B1 - DEVICE FOR CATALYTIC CLEANING OF EXHAUST GASES FROM COMBUSTION MACHINES - Google Patents
DEVICE FOR CATALYTIC CLEANING OF EXHAUST GASES FROM COMBUSTION MACHINESInfo
- Publication number
- DE2220921B1 DE2220921B1 DE19722220921 DE2220921A DE2220921B1 DE 2220921 B1 DE2220921 B1 DE 2220921B1 DE 19722220921 DE19722220921 DE 19722220921 DE 2220921 A DE2220921 A DE 2220921A DE 2220921 B1 DE2220921 B1 DE 2220921B1
- Authority
- DE
- Germany
- Prior art keywords
- wall
- catalyst body
- rings
- housing
- supported
- 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.)
- Granted
Links
Classifications
-
- 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
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
- F01N3/2853—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration using mats or gaskets between catalyst body and housing
-
- 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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
- F01N13/141—Double-walled exhaust pipes or housings
-
- 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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/18—Construction facilitating manufacture, assembly, or disassembly
- F01N13/1888—Construction facilitating manufacture, assembly, or disassembly the housing of the assembly consisting of two or more parts, e.g. two half-shells
- F01N13/1894—Construction facilitating manufacture, assembly, or disassembly the housing of the assembly consisting of two or more parts, e.g. two half-shells the parts being assembled in longitudinal direction
-
- 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
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
-
- 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
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
- F01N3/2853—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration using mats or gaskets between catalyst body and housing
- F01N3/2867—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration using mats or gaskets between catalyst body and housing the mats or gaskets being placed at the front or end face of catalyst body
-
- 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
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
- F01N3/2875—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration by using elastic means, e.g. spring leaves, for retaining catalyst body in the housing
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Description
Es ist vorteilhaft, die Zahl der Zwischenringe möglichst klein zu halten und nach Möglichkeit nur einen Zwischenring in der Mitte zwischen den Stirnseiten des Katalysatorkörpers anzuordnen. Die Dämpfungswirkung kann dabei noch dadurch erhöht werden, daß die Innenwand und/oder die Außenwand im Bereich des Zwischenrings unterbrochen ist und sich überlappende. gegen den Zwischenring drückende miteinander verbundene Enden Aufweist. It is advantageous to keep the number of intermediate rings as small as possible hold and if possible only an intermediate ring in the middle between the front sides to arrange the catalyst body. The damping effect can thereby still be achieved be increased that the inner wall and / or the outer wall in the region of the intermediate ring is interrupted and overlapping. pressing against the intermediate ring Has interconnected ends.
Zur Verbesserung des Halts der Ringe. Endringe bzw. Zwischenringe schlägt die Erfindung vor. daß einer oder mehrere Ringe. Endrige bzw Zwischenringe formschlüssig mit der Innenwand und oder der Außenwand und'oder der Umfangsfläche des Katalysatorkörpers zusammenwirkend angeordnet sind. To improve the hold of the rings. End rings or intermediate rings proposes the invention. that one or more rings. End or intermediate rings form-fitting with the inner wall and or the outer wall and'or the peripheral surface of the catalyst body are arranged cooperating.
Bei Verwendung von steifen Gehäuse"änden. z. B. dickwandigen Beichwänden. ist es zur Forderung der Dämpfungswirkung vorteilhaft. daß die innenwand parallel zur Durchströmungsrichtung des Katalysator-Körpers verlaufende Schlitze aufweist. When using rigid enclosure walls, e.g. thick-walled beech walls. it is advantageous to demand the damping effect. that the inner wall is parallel has slits extending to the direction of flow through the catalytic converter body.
Selbstverständlich müssen die verschiedenen Ringe bzw. Packungen gasdicht ausgebildet sein. damit die gesamte Abfasmengeden Katalysatorkörperdurchströmt. Of course, the different rings or packings be made gas-tight. so that the catalyst body flows through the entire waste volume.
Im Rahmen der Erfindung ist es möglich. Außerwand und'oder Innenwand des Gehäuses des Katalysatorkörpers jeweils in einei- bestimmten Ebene geteilt auszubilden und die Gehäusehölften in der jeweiligen Teilfuge miteinander zu verbinden. Dabei ist wesentsieb. daß die genannten Gehäusehälften so dimensioniert sind. daß naci ihre; Verbindung die xerschiedenen Ringe unter radialer Spannung stehen. -obe zur radialer Spannung auch noch eine axiale Spannungkonponente durch ensprechende Einwirkung axialergehäusekräfte hinzutreten kann. It is possible within the scope of the invention. Outer wall and'or inner wall of the housing of the catalyst body in each case divided into a specific plane and to connect the housing halves to one another in the respective parting line. Included is essential sieve. that the said housing halves are so dimensioned. that naci their; Connection the various rings are under radial tension. -obe to radial stress also has an axial stress component due to the corresponding action axial housing forces can occur.
Ein Ausföhrungsbeispiel der Erfindung ist in zwei Schnitten In der Zeichnung dargestellt Es zeigt Fig. 1 einen axialen Halbschiiitt durch die erfindungsgemäße Vorrichtung. An exemplary embodiment of the invention is shown in two sections Drawing shown. FIG. 1 shows an axial half-section through the inventive Contraption.
Fig. 2 einen Querschnitt gem. il-ll der Fig. i. FIG. 2 shows a cross section according to FIG. 11 of FIG.
Gemäß den Fig. 1 und 2 wird der Katalysatorkörper 1 in Richtung des Pfeils P von den zu entgiftenden Abgasen durchstromt. Der Katalysatorkörper besteht au einem brüchigen. feuer es keramischen Werkstoff, beispielsweise aus Magnesiumsilikat. Aluminiumoxid od. dgl. Seine Empfindlichkeit gegen Stöße wird noch dadurch erhöht. daß 11 ihm eine ielzahl kleiner Strömungskanäle ausgebildet ist. 3 daß er eine skelettartige Struktur aufweist. Je nachdem, ob es sich um einen Oxydations- oder einen Reduktionskatalysator handelt. hat die Struktur einen Überzug aus einen; für die zu erzielende katalytische Wirkung geeignetem Werkstoff. Für einen Oxydationskatalysator kommen beispielsweise feuerfeste Metalloxide oder Metalle wie Platin, Rhodium od. dgl. in Frage. According to FIGS. 1 and 2, the catalyst body 1 is in the direction of the Arrow P flowed through by the exhaust gases to be detoxified. The catalyst body consists au brittle. fire it ceramic material, for example made of magnesium silicate. Aluminum oxide or the like. Its sensitivity to impacts is thereby increased. that 11 him a large number of small flow channels is formed. 3 that he's a skeletal Has structure. Depending on whether it is an oxidation or a reduction catalyst acts. the structure has a coating of one; for the catalytic to be achieved Effect suitable material. For an oxidation catalyst, for example Refractory metal oxides or metals such as platinum, rhodium or the like. In question.
Zu seinem Schutz und um ihn überhaupt ohne Bruchgefahr fassen ztr können. ist der Katalysatorkörper 1 von einem Schutzmantel 2 umgeben. z. B. aus einem hitzebeständigen Zement oder einer Kittmasse, die im wesentlichen aus flaumigen, chemisch stabilen unbrenllbarel, Mineralfasern. Im wesentlichen aus Aluminiumoxid und Siliziumoxid mit Bindemittelzusatz, besteht. For his protection and around him at all without risk of breakage ztr can. the catalyst body 1 is surrounded by a protective jacket 2. z. B. off a heat-resistant cement or putty, which essentially consists of fluffy, chemically stable non-inflammable, mineral fibers. Essentially made of aluminum oxide and silicon oxide with added binder.
Der Schutzmantel 2 ist an seinen Enden an seinem gesamten Umfang von Ringen 3a. 3h eingefaßt. Diese Ringe bestehen ebenso wie die Endringe 4a, 4h und der Zwischenrlng 5. welche jeweils zwischen der Außenwand 6 und der Innenwand 7 des Gehäuses angeordnet sind. aus elastisch-nachgiebigen, hitzebeständigen Mineralfasern. in den Ringen sind die Mineralfasern bevorzugt so stark verdichtet, daß sie eine bestimmte Preßform annehmen. Die Ringe erhalten dadurch eine hohe Elastizität. die auch bei hohen Temperaturen dauerhaft aufrecht erhalten wird. Die Ringe 3a, 3b. 4a. 4b, 5 können von einem Drahtnetz umgeben oder mit einem Drahtgeflecht armiert sein. bevorzugt unter Verwendung eines Drahtes. welcher als Legierung-bestandteile Chrom. Aluminium und oder Kobalt enthält Die Gehäusewände selbst bestehen bevorzugt aus ei';c!T1 Nickel-Chrom-legierten Stahl mit austenitischer Gefüge, der bis zu 1150°C hitze- und zunderbeständig ist. The protective jacket 2 is at its ends over its entire circumference of rings 3a. 3h bordered. These rings exist just like the end rings 4a, 4h and the intermediate ring 5, each between the outer wall 6 and the inner wall 7 of the housing are arranged. made of elastic, resilient, heat-resistant mineral fibers. In the rings, the mineral fibers are preferably so strongly compressed that they one take on a certain shape. This gives the rings a high degree of elasticity. the is maintained permanently even at high temperatures. The rings 3a, 3b. 4a. 4b, 5 can be surrounded by a wire mesh or reinforced with a wire mesh be. preferably using a wire. which as alloy components Chrome. Contains aluminum and / or cobalt. The housing walls themselves are preferably made Made of ei '; c! T1 nickel-chromium alloy steel with austenitic structure, which is up to 1150 ° C is heat and scaling resistant.
Zur Vereifachung der Montage sind die Gehäusewände 6 und 7 jeweils zweiteilig ausgebildet. wobei die inneren Enden der Teile sich im Bereich des Zwischenrings 5 bei 8 bzw. 9 überlappen und durch Punktschweißen miteinander verbunden sind. To simplify assembly, the housing walls 6 and 7 are each designed in two parts. wherein the inner ends of the parts are in the area of the intermediate ring 5 overlap at 8 or 9 and are connected to one another by spot welding.
Schwingungen der Gehäuseteile, welche beispielsweise im Bereich des Zwischnrings auftreten. pflanzen sich mit abnehmender Amplitude in der Außenwand 6 weiter bis zu den Endringen 4a. 4k. in der Innenwand 7 bis zu den Ringen 3a. 36. Damit werden beim Auftreten voll Stößen Dämpfungsstrecken von jeweils mindestens der Halben Länge des Katalysatorkörpers erzielt, bis die verbleibende Restschwingung über die Ringe 3a. 3k in den Schutzmantel 2 im Bereich seiner Endrippen 10a, 10b eingeleitete wird. Die Endrippen 10a, 10b greifen in die Ringe 3am 3b formschlässig ein. Vibrations of the housing parts, which for example in the area of the Intermediate rings occur. plant themselves in the outer wall with decreasing amplitude 6 further up to the end rings 4a. 4k. in the inner wall 7 up to the rings 3a. 36. This means that when full shocks occur, damping distances of at least half the length of the catalyst body achieved until the remaining oscillation over the rings 3a. 3k in the protective jacket 2 in the area of its end ribs 10a, 10b is initiated. The end ribs 10a, 10b engage in the rings 3am 3b in a form-fitting manner a.
In Fig. 7 wurde zugunsten der Klarheit der Darsiellung auf eine Senraffur der geschnittenen Teile sowie des Zwischenrigs 5 verzichtet. In Fig. 7, a mustard was used for the sake of clarity the cut parts and the intermediate rig 5 are omitted.
Claims (6)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19722220921 DE2220921C2 (en) | 1972-04-28 | 1972-04-28 | DEVICE FOR CATALYTIC CLEANING OF EXHAUST GASES FROM COMBUSTION MACHINES |
US05/342,540 US4335077A (en) | 1972-03-21 | 1973-03-19 | Catalyzer for detoxifying exhaust gases from internal combustion engines |
CA166,522A CA996357A (en) | 1972-03-21 | 1973-03-20 | Catalyzer for detoxifying exhaust gases from internal combustion engines |
US05/831,045 US4344922A (en) | 1972-03-21 | 1977-09-06 | Catalyzer for detoxifying exhaust gases from internal combustion |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19722220921 DE2220921C2 (en) | 1972-04-28 | 1972-04-28 | DEVICE FOR CATALYTIC CLEANING OF EXHAUST GASES FROM COMBUSTION MACHINES |
Publications (2)
Publication Number | Publication Date |
---|---|
DE2220921B1 true DE2220921B1 (en) | 1973-11-08 |
DE2220921C2 DE2220921C2 (en) | 1974-05-30 |
Family
ID=5843565
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19722220921 Expired DE2220921C2 (en) | 1972-03-21 | 1972-04-28 | DEVICE FOR CATALYTIC CLEANING OF EXHAUST GASES FROM COMBUSTION MACHINES |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2220921C2 (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3430399A1 (en) * | 1984-08-17 | 1986-02-20 | Voest-Alpine St. Aegyd AG, St. Aegyd am Neuwalde | CATALYTIC EXHAUST GAS PURIFICATION DEVICE |
DE3729994A1 (en) * | 1987-09-08 | 1989-03-16 | Bischoff Erhardt Gmbh Co Kg | Apparatus for the catalytic purification of exhaust gases |
DE3834403A1 (en) * | 1988-10-10 | 1990-04-12 | Zeuna Staerker Kg | DEVICE FOR THE CATALYTIC PURIFICATION OF EXHAUST GAS FROM COMBUSTION ENGINES |
DE3837503A1 (en) * | 1988-11-04 | 1990-05-10 | Gillet Heinrich Gmbh | EXHAUST CATALYST FOR MOTOR VEHICLES |
DE4009945A1 (en) * | 1990-03-28 | 1991-10-02 | Gillet Heinrich Gmbh | EXHAUST GAS CONVERTER FOR INTERNAL COMBUSTION ENGINES |
EP0537603A1 (en) * | 1991-10-18 | 1993-04-21 | Firma J. Eberspächer | Double-walled air-insulated pipe for exhaust installations in vehicles |
WO2012074459A1 (en) | 2010-12-03 | 2012-06-07 | Scania Cv Ab | Insert, holder and post-treatment unit for exhaust gases |
EP3467280A4 (en) * | 2016-05-31 | 2019-11-20 | Hitachi Zosen Corporation | Exhaust gas treatment device |
US11377990B2 (en) * | 2019-01-09 | 2022-07-05 | Futaba Industrial Co., Ltd. | Exhaust pipe |
-
1972
- 1972-04-28 DE DE19722220921 patent/DE2220921C2/en not_active Expired
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3430399A1 (en) * | 1984-08-17 | 1986-02-20 | Voest-Alpine St. Aegyd AG, St. Aegyd am Neuwalde | CATALYTIC EXHAUST GAS PURIFICATION DEVICE |
DE3729994A1 (en) * | 1987-09-08 | 1989-03-16 | Bischoff Erhardt Gmbh Co Kg | Apparatus for the catalytic purification of exhaust gases |
DE3834403A1 (en) * | 1988-10-10 | 1990-04-12 | Zeuna Staerker Kg | DEVICE FOR THE CATALYTIC PURIFICATION OF EXHAUST GAS FROM COMBUSTION ENGINES |
DE3837503A1 (en) * | 1988-11-04 | 1990-05-10 | Gillet Heinrich Gmbh | EXHAUST CATALYST FOR MOTOR VEHICLES |
DE4009945A1 (en) * | 1990-03-28 | 1991-10-02 | Gillet Heinrich Gmbh | EXHAUST GAS CONVERTER FOR INTERNAL COMBUSTION ENGINES |
EP0537603A1 (en) * | 1991-10-18 | 1993-04-21 | Firma J. Eberspächer | Double-walled air-insulated pipe for exhaust installations in vehicles |
WO2012074459A1 (en) | 2010-12-03 | 2012-06-07 | Scania Cv Ab | Insert, holder and post-treatment unit for exhaust gases |
EP2646666A1 (en) * | 2010-12-03 | 2013-10-09 | Scania CV AB | Insert, holder and post-treatment unit for exhaust gases |
EP2646666A4 (en) * | 2010-12-03 | 2014-05-21 | Scania Cv Ab | Insert, holder and post-treatment unit for exhaust gases |
EP3467280A4 (en) * | 2016-05-31 | 2019-11-20 | Hitachi Zosen Corporation | Exhaust gas treatment device |
US11377990B2 (en) * | 2019-01-09 | 2022-07-05 | Futaba Industrial Co., Ltd. | Exhaust pipe |
Also Published As
Publication number | Publication date |
---|---|
DE2220921C2 (en) | 1974-05-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
E77 | Valid patent as to the heymanns-index 1977 |