US3683622A - Method of supplying a propulsion device with fuel - Google Patents
Method of supplying a propulsion device with fuel Download PDFInfo
- Publication number
- US3683622A US3683622A US863505A US3683622DA US3683622A US 3683622 A US3683622 A US 3683622A US 863505 A US863505 A US 863505A US 3683622D A US3683622D A US 3683622DA US 3683622 A US3683622 A US 3683622A
- Authority
- US
- United States
- Prior art keywords
- fuel
- fuel cell
- hydrocarbon
- propulsion device
- hydroaromatic
- 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.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G1/00—Hot gas positive-displacement engine plants
- F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
- F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2700/00—Supplying, feeding or preparing air, fuel, fuel air mixtures or auxiliary fluids for a combustion engine; Use of exhaust gas; Compressors for piston engines
- F02M2700/43—Arrangements for supplying air, fuel or auxiliary fluids to a combustion space of mixture compressing engines working with liquid fuel
- F02M2700/4302—Arrangements for supplying air, fuel or auxiliary fluids to a combustion space of mixture compressing engines working with liquid fuel whereby air and fuel are sucked into the mixture conduit
- F02M2700/4314—Arrangements for supplying air, fuel or auxiliary fluids to a combustion space of mixture compressing engines working with liquid fuel whereby air and fuel are sucked into the mixture conduit with mixing chambers disposed in parallel
Definitions
- the invention relates to propulsion devices for submarines including an electric motor propulsion system for slow speed and a hydrocarbon-powered device for higher speeds.
- the Prior Art Propulsion devices for submarines comprise a propulsion system for low speed comprising an electric motor which is supplied with current from a fuel cell batteryrunning on hydrogen and oxygen and a driving system for high speed comprising a steam turbine which is supplied with over-heated steam developed in a combustion chamber by combustion of hydrogen and oxygen.
- the hydrogen and oxygen are stored in liquid form in fuel tanks in the submarine.
- the fuel is stored in the form of hydroaromatic hydrocarbons which split during operation of the propulsion device into hydrogen which is supplied to the fuel cell as fuel and into the corresponding aromatic hydrocarbon which is supplied to the combustion chamber of the steam turbine or the equivalent as fuel.
- the hydroaromatic hydrocarbons are liquid or solid at room temperature and can therefore be stored in simple and light fuel tanks. Further, it has been found that the aromatic hydrocarbon produced can be completely consumed in the combustion chamber of the turbine or the equivalent. In this way an extremely compact fuel system is obtained for the propulsion device from the fuel/energy point of view.
- the invention thus relates to a method of supplying a propulsion device with fuel, comprising a first propulsion system comprising an electric motor which is supplied with current from a fuel cell battery and a second propulsion system comprising machinery with a combustion chamber for combustion of a fuel, such as a combustion motor, a Stirling motor, a steam turbine or a gas turbine, characterized in that the fuel of the propulsion device is stored near the propulsion device in the form of a hydroaromatic hydrocarbon or a mixture of at least two hydroaromatic hydrocarbons which split during operation to form hydrogen and the corresponding aromatic hydrocarbon(s), the hydrogen produced being supplied as fuel to the fuel cell and the aromatic hydrocarbon(s) produced being supplied as fuel to the machinery with the combustion chamber.
- a fuel such as a combustion motor, a Stirling motor, a steam turbine or a gas turbine
- the propulsion device according to the present invention is also suitable for other purposes than submarines where a high energy: fuel ratio is required, for example space-research vehicles.
- the hydroaromatic hydrocarbon may consist, among other things, of hexahydrobenzene C H (cyclohexane), decahydronaphthalene C I-I (decaline),
- hydroaromatic hydrocarbons are particularly preferred which are liquid at room temperature, for example hexahydrobenzene, decahydronaphthalene and tetrahydronaphthalene or mixtures of these hydrocarbons. I-Iexahydrobenzene is particularly preferred since this substance produces the greatest quantity of energy per weight unit.
- Solid hydroaromatic hydrocarbons are also usable but they should suitably be used with other hydrocarbons which, together with the solid hydrocarbon, produce liquid mixtures.
- the invention also relates to a means for carrying out the method described, comprising a propulsion device which comprises a first propulsion system consisting of an electric motor which is supplied with current from a fuel cell battery and a second propulsion system comprising machinery with a combustion chamber for combustion of a fuel such as a combustion motor, a Stirling motor, a steam turbine or a gas turbine, characterized in that a reactor for splitting the hydroaromatic hydrocarbons to hydrogen and the corresponding aromatic hydrocarbon is connected to the propulsion device with a connection to the fuel cell for the supply of hydrogen produced as fuel to the fuel cell and with a connection to the combustion chamber in the machinery with combustion chamber for the supply of aromatic hydrocarbon produced to the combustion chamber.
- a propulsion device which comprises a first propulsion system consisting of an electric motor which is supplied with current from a fuel cell battery and a second propulsion system comprising machinery with a combustion chamber for combustion of a fuel such as a combustion motor, a Stirling motor, a steam turbine or a gas turbine, characterized in that
- FIG. 1 shows schematically a means for carrying out the method according to the invention
- FIG. 2 shows schematically a fuel cell in the fuel cell battery of the means and
- FIG. 3 shows schematically a common power transmission from the two propulsion systems in the propulsion device.
- l0 designates a fuel cell battery driven by hydrogen gas and oxygen gas, which generates electric energy in known manner.
- the fuel cell battery charges an accumulator battery 12, for example a lead battery, through conduits 11.
- the accumulator battery is connected by conduits 13 to a DC motor 14 which directly drives the propeller shaft 15 of a submarine. Since the DC motor is directly connected to the propeller shaft a low speed motor can be used, which runs more quietly since there is no noisy gear in the propulsion system. For low speed preferably only this fuel cell battery is used with its accumulator and motor to provide the propulsion system for the submarine.
- the propulsion device also includes a second propulsion system comprising machinery with a combustion chamber, in the example shown a gas turbine 16 with a combustion chamber 17.
- the turbine is connected to the propeller shaft over a gear 18 and a coupling 19.
- the coupling 19 is connected the turbine 16 and the DC motor 14 drive the propeller shaft 15 simultaneously so that the highest driving power can be obtained. This is of course the case at high speed.
- the turbine 16 and gear 18 are complete ly disconnected with the help of the coupling 19.
- the fuel for the propulsion device is stored in the tank 20 and consists in the example of hexahydrobenzene C I'I (cyclohexane). It is led through the conduit 21 to a heated reactor 22 containing a catalyst, for example platinum, palladium or nickel. Hexahydrobenzene is split in the reactor at 200300 C to form hydrogen gas and benzene C H The mixture of hydrogen gas and benzene is led through the conduit 23 to a cooler 24 in which the benzene condenses to a liquid while the hydrogen remains a gas. The hydrogen gas is led from the cooler through the conduit 25 to a fuel chamber in the fuel cell battery 10. Hydrogen gas which is not consumed in the fuel cell battery is returned through the conduit 26 to the cooler 24. The benzene is led through the conduit 27 to a storage tank 36 and from there to the combustion chamber 17 of the turbine.
- a catalyst for example platinum, palladium or nickel.
- Hexahydrobenzene is split in the reactor at 200300 C to form hydrogen gas
- the oxidant of the propulsion device is stored in the tank 28 and consists in the example of liquid oxygen.
- the oxygen is led through a conduit 29 which penetrates the cooler 24 to the oxidant chamber in the fuel cell battery. From there unconsumed oxygen is led off through the conduit 30 by a circulation pump, not shown, to a point in the conduit 29.
- the oxygen which is vaporized on its way to the fuel cell battery is used as coolant in the cooler 24.
- Oxygen is also led through the conduit 31 to the combustion chamber 17 of the turbine where it reacts with benzene at a high temperature, preferably 800l,000 C.
- the gaseous reaction products are led from the combustion chamber through a conduit 32 to the turbine 16 and then to a condenser 33 in which the pressure is kept very low with the help of a vacuum pump 34 in known manner.
- the condensate is led off through the conduit 35.
- hydrogen peroxide for example, may be used as oxidant.
- both the fuel and the oxidant may be stored as liquids at normal pressure.
- the decomposition heat when the hydrogen peroxide splits to from oxygen and water which can be done, for example, with platinum as catalyst, can advantageously be used for the catalytic splitting of the hydrogen gas from the hexahydrobenzene or other hydroaromatic hydrocarbon used.
- the separation of the hydrogen gas and benzene can be done by means of a membrane which is only permeable to hydrogen gas.
- This membrane may consist, for example, of palladiumsilver and is suitably arranged in the immediate vicinity of the reactor so that it obtains the required operating temperature in a simple manner.
- the hydrogen gas is led from behind the membrane to the fuel cell, while the benzene remains at the front of the membrane and is led to a smaller cooler to be condensed and carried to the storage tank 36.
- a fuel cell battery usually consists of a very large number of fuel electrodes and oxidant electrodes stacked successively with spaces for fuel, oxidant and electrolyte between them. Part of such a fuel cell battery is shown in FIG. 2. It contains the porous fuel electrodes 40 consisting of, for example, nickel activated with platinum and the porous oxidant electrodes 41 consisting of, for example nickel activated with silver.
- the electrodes 40 are attached in the frames 42 and the electrodes 41 in the frames 43.
- the frames may consist, for example, of a thermosetting resin.
- the frames are held together by clamp means, not shown, in the stacking direction and may be sealed to each other, for example by O-rings or by welded joints of thermosetting resin.
- the electrodes are connected by outer conductor rails, not shown, either in series with each other or in parallel.
- the porous electrodes 40 form separating walls between the fuel in the gas chamber 44 and the electrolyte in the electrolyte chamber 45.
- the porous electrodes 41 form separating walls between the oxidant in the gas chamber 46 and the electrolyte in the electrolyte chamber 45.
- the motor 14 comprises a stator and a rotor 61,
- the stator 60 is journalled by means of bearings 62 directly on the propeller shaft 15.
- the rotor 61 is supported by a hollow shaft 63 which is also journalled on the propeller shaft 15 by means of bearings 64.
- a coupling 65 the rotor 61 can be connected to the shaft 15 or disconnected from it. If it is not desired to disconnect the motor 14 from the propeller shaft 15, the coupling 65 may be made permanent.
- the turbine 16 is connected to the propeller shaft 15 over the gear 18 and coupling 19. The propeller shaft can thus be driven either by the motor 14 or the turbine 16, or by both simultaneously.
- Method of supplying a propulsion device with fuel said propulsion device comprising a fuel cell battery and a first propulsion system comprising an electric motor which is supplied with current from said fuel cell battery and a second propulsion system comprising machinery with a combustion chamber for combustion of a hydrocarbon fuel, which comprises storing the fuel of the propulsion device near the propulsion device in the form of at least one hydroaromatic hydrocarbon, splitting said hydroaromatic hydrocarbon to form a mixture consisting essentially of hydrogen and the corresponding aromatic hydrocarbon, supplying the hydrogen produced as fuel to the fuel cell and supplying the aromatic hydrocarbon produced as fuel to the machinery with the combustion chamber.
- hydroaromatic hydrocarbon fuel consists essentially of a mixture of at least two of the substances selected from the group consisting of hexahydrobenzene, decahydronaphthalene and tetrahydronaphthalene.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel Cell (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE13640/68A SE324756B (es) | 1968-10-09 | 1968-10-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3683622A true US3683622A (en) | 1972-08-15 |
Family
ID=20297748
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US863505A Expired - Lifetime US3683622A (en) | 1968-10-09 | 1969-10-03 | Method of supplying a propulsion device with fuel |
Country Status (5)
Country | Link |
---|---|
US (1) | US3683622A (es) |
DE (1) | DE1950495C3 (es) |
FR (1) | FR2030053A1 (es) |
GB (1) | GB1280870A (es) |
SE (1) | SE324756B (es) |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5678647A (en) * | 1994-09-07 | 1997-10-21 | Westinghouse Electric Corporation | Fuel cell powered propulsion system |
US5728464A (en) * | 1996-01-02 | 1998-03-17 | Checketts; Jed H. | Hydrogen generation pelletized fuel |
US5817157A (en) * | 1996-01-02 | 1998-10-06 | Checketts; Jed H. | Hydrogen generation system and pelletized fuel |
US6012399A (en) * | 1999-03-24 | 2000-01-11 | Reusable Rolls, Inc. | Paperboard pallet |
US6101686A (en) * | 1998-03-17 | 2000-08-15 | Daimlerchrysler Corporation | Interior trim spring clip |
US20020127449A1 (en) * | 2001-03-12 | 2002-09-12 | Masaki Ban | Compound-type energy generation system |
US20030153216A1 (en) * | 2000-09-06 | 2003-08-14 | Van-Drentham-Susman Hector Filipus Alexander | Propulsion apparatus |
US20040025808A1 (en) * | 2001-08-07 | 2004-02-12 | Cheng Christopher T. | Portable hydrogen generation using metal emulsions |
US20040199305A1 (en) * | 2003-04-01 | 2004-10-07 | Hartmut Angenendt | Method and device for determining the residual travel duration of a submarine |
US20050091981A1 (en) * | 2003-10-29 | 2005-05-05 | Rainer Saliger | Vehicle with a combustion engine and a fuel cell device |
US20060228960A1 (en) * | 2005-04-07 | 2006-10-12 | Lockheed Martin Corporation | Integrated marine vessel hull for energy storage |
US20110226173A1 (en) * | 2008-06-16 | 2011-09-22 | Sancoff Gregory E | Fleet protection attack craft |
WO2012135718A1 (en) * | 2011-03-30 | 2012-10-04 | Juliet Marine Systems, Inc. | High speed surface craft and submersible vehicle |
US8857365B2 (en) | 2008-06-16 | 2014-10-14 | Juliet Marine Systems, Inc. | Fleet protection attack craft and underwater vehicles |
US9327811B2 (en) | 2008-06-16 | 2016-05-03 | Juliet Marine Systems, Inc. | High speed surface craft and submersible craft |
US9663212B2 (en) | 2008-06-16 | 2017-05-30 | Juliet Marine Systems, Inc. | High speed surface craft and submersible vehicle |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2275309B (en) * | 1993-02-22 | 1997-10-29 | Yang Tai Her | Differential coupling and compounding system |
DE102011115950A1 (de) * | 2011-10-09 | 2013-04-11 | Friedrich-Alexander-Universität Erlangen-Nürnberg | Energiequelle zum Betrieb von Unterwasserschiffen |
RU2502631C1 (ru) * | 2012-12-11 | 2013-12-27 | Николай Борисович Болотин | Подводная лодка и двигательная установка подводной лодки |
RU2501705C1 (ru) * | 2012-12-11 | 2013-12-20 | Николай Борисович Болотин | Подводная лодка и двигательная установка подводной лодки |
RU2507107C1 (ru) * | 2012-12-17 | 2014-02-20 | Николай Борисович Болотин | Модульная атомная подводная лодка |
RU2506198C1 (ru) * | 2012-12-17 | 2014-02-10 | Николай Борисович Болотин | Атомная подводная лодка |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3113425A (en) * | 1960-10-01 | 1963-12-10 | Monsanto Res Corp | Ortho-substituted bicyclohexyl hydrocarbons as high energy fuels |
US3173247A (en) * | 1962-11-30 | 1965-03-16 | Monsanto Res Corp | Operation and cooling of flight vehicles with hydrocarbons |
US3230701A (en) * | 1961-10-06 | 1966-01-25 | Texaco Experiment Inc | Two step reaction propulsion method |
US3263414A (en) * | 1964-04-17 | 1966-08-02 | Exxon Research Engineering Co | Endothermic reactions for cooling and providing fuel in supersonic combustion |
-
1968
- 1968-10-09 SE SE13640/68A patent/SE324756B/xx unknown
-
1969
- 1969-10-03 US US863505A patent/US3683622A/en not_active Expired - Lifetime
- 1969-10-03 FR FR6933863A patent/FR2030053A1/fr not_active Withdrawn
- 1969-10-07 DE DE1950495A patent/DE1950495C3/de not_active Expired
- 1969-10-08 GB GB49350/69A patent/GB1280870A/en not_active Expired
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3113425A (en) * | 1960-10-01 | 1963-12-10 | Monsanto Res Corp | Ortho-substituted bicyclohexyl hydrocarbons as high energy fuels |
US3230701A (en) * | 1961-10-06 | 1966-01-25 | Texaco Experiment Inc | Two step reaction propulsion method |
US3173247A (en) * | 1962-11-30 | 1965-03-16 | Monsanto Res Corp | Operation and cooling of flight vehicles with hydrocarbons |
US3263414A (en) * | 1964-04-17 | 1966-08-02 | Exxon Research Engineering Co | Endothermic reactions for cooling and providing fuel in supersonic combustion |
Non-Patent Citations (1)
Title |
---|
Heffner et al., pp. 318 325 and 330 331 of Fuel Cell Systems, Advances in Chemistry Series 47, American Chemical Society, Washington, D.C., 1965 TK 2920 A5 1963/64 . * |
Cited By (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5678647A (en) * | 1994-09-07 | 1997-10-21 | Westinghouse Electric Corporation | Fuel cell powered propulsion system |
US5728464A (en) * | 1996-01-02 | 1998-03-17 | Checketts; Jed H. | Hydrogen generation pelletized fuel |
US5817157A (en) * | 1996-01-02 | 1998-10-06 | Checketts; Jed H. | Hydrogen generation system and pelletized fuel |
US6101686A (en) * | 1998-03-17 | 2000-08-15 | Daimlerchrysler Corporation | Interior trim spring clip |
US6012399A (en) * | 1999-03-24 | 2000-01-11 | Reusable Rolls, Inc. | Paperboard pallet |
US20030153216A1 (en) * | 2000-09-06 | 2003-08-14 | Van-Drentham-Susman Hector Filipus Alexander | Propulsion apparatus |
US6837759B2 (en) * | 2000-09-06 | 2005-01-04 | Rotech Holding Limited | Propulsion apparatus |
EP1241339A2 (en) * | 2001-03-12 | 2002-09-18 | Honda Giken Kogyo Kabushiki Kaisha | Compound-type energy generation system |
EP1241339A3 (en) * | 2001-03-12 | 2003-06-04 | Honda Giken Kogyo Kabushiki Kaisha | Compound-type energy generation system |
US6740439B2 (en) | 2001-03-12 | 2004-05-25 | Honda Giken Kogyo Kabushiki Kaisha | Compound-type energy generation system |
US20020127449A1 (en) * | 2001-03-12 | 2002-09-12 | Masaki Ban | Compound-type energy generation system |
US20040025808A1 (en) * | 2001-08-07 | 2004-02-12 | Cheng Christopher T. | Portable hydrogen generation using metal emulsions |
US6834623B2 (en) | 2001-08-07 | 2004-12-28 | Christopher T. Cheng | Portable hydrogen generation using metal emulsions |
US20040199305A1 (en) * | 2003-04-01 | 2004-10-07 | Hartmut Angenendt | Method and device for determining the residual travel duration of a submarine |
US7299114B2 (en) * | 2003-04-01 | 2007-11-20 | Howaldtswerke-Deutsche Werft Ag | Method and device for determining the residual travel duration of a submarine |
US20050091981A1 (en) * | 2003-10-29 | 2005-05-05 | Rainer Saliger | Vehicle with a combustion engine and a fuel cell device |
US7152408B2 (en) * | 2003-10-29 | 2006-12-26 | Robert Bosch Gmbh | Vehicle with a combustion engine and a fuel cell device |
US20060228960A1 (en) * | 2005-04-07 | 2006-10-12 | Lockheed Martin Corporation | Integrated marine vessel hull for energy storage |
US10730597B2 (en) | 2008-06-16 | 2020-08-04 | Juliet Marine Systems, Inc. | High speed surface craft and submersible craft |
US20110226173A1 (en) * | 2008-06-16 | 2011-09-22 | Sancoff Gregory E | Fleet protection attack craft |
US8408155B2 (en) | 2008-06-16 | 2013-04-02 | Juliet Marine Systems, Inc. | Fleet protection attack craft |
US8683937B2 (en) | 2008-06-16 | 2014-04-01 | Juliet Marine Systems, Inc. | High speed surface craft and submersible vehicle |
US9783275B2 (en) | 2008-06-16 | 2017-10-10 | Juliet Marine Systems, Inc. | High speed surface craft and submersible craft |
US8857365B2 (en) | 2008-06-16 | 2014-10-14 | Juliet Marine Systems, Inc. | Fleet protection attack craft and underwater vehicles |
US9327811B2 (en) | 2008-06-16 | 2016-05-03 | Juliet Marine Systems, Inc. | High speed surface craft and submersible craft |
US9403579B2 (en) | 2008-06-16 | 2016-08-02 | Juliet Marine Systems, Inc. | Fleet protection attack craft |
US9555859B2 (en) | 2008-06-16 | 2017-01-31 | Juliet Marine Systems, Inc. | Fleet protection attack craft and underwater vehicles |
US9592894B2 (en) | 2008-06-16 | 2017-03-14 | Juliet Marine Systems, Inc. | High speed surface craft and submersible vehicle |
US9663212B2 (en) | 2008-06-16 | 2017-05-30 | Juliet Marine Systems, Inc. | High speed surface craft and submersible vehicle |
WO2012135718A1 (en) * | 2011-03-30 | 2012-10-04 | Juliet Marine Systems, Inc. | High speed surface craft and submersible vehicle |
JP2014512300A (ja) * | 2011-03-30 | 2014-05-22 | ジュリエット・マリン・システムズ,インコーポレーテッド | 高速水上艇および潜水航行体 |
Also Published As
Publication number | Publication date |
---|---|
SE324756B (es) | 1970-06-15 |
DE1950495B2 (de) | 1973-10-25 |
GB1280870A (en) | 1972-07-05 |
DE1950495C3 (de) | 1974-05-30 |
FR2030053A1 (es) | 1970-10-30 |
DE1950495A1 (de) | 1970-10-29 |
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