US3677526A - Carburetion devices for internal combustion engine - Google Patents

Carburetion devices for internal combustion engine Download PDF

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Publication number
US3677526A
US3677526A US14456A US3677526DA US3677526A US 3677526 A US3677526 A US 3677526A US 14456 A US14456 A US 14456A US 3677526D A US3677526D A US 3677526DA US 3677526 A US3677526 A US 3677526A
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United States
Prior art keywords
suction
carburetion
idling
capsule
atmospheric pressure
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Expired - Lifetime
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US14456A
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English (en)
Inventor
Michel Eugene Pierlot
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Societe Industrielle de Brevets et dEtudes SIBE
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Societe Industrielle de Brevets et dEtudes SIBE
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    • 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
    • F02M3/00—Idling devices for carburettors
    • F02M3/08—Other details of idling devices
    • F02M3/09—Valves responsive to engine conditions, e.g. manifold vacuum
    • 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
    • Y10S261/00—Gas and liquid contact apparatus
    • Y10S261/19—Degassers

Definitions

  • ABSTRACT The device has a main jet for normal operation and an idling circuit, both opening into the intake pipe and provided with calibrated orifices to adjust the richness of the air/fuel mixture.
  • An adjustable throttle enables the idling mixture to be adjusted.
  • the adjustable throttle can be bypassed through a passage to the mixing channel during deceleration.
  • the passage has a closing member actuated by a capsule governed by the suction in the intake and by a member sensitive to the engine's speed. When the bypass is closed the capsule is connected to atmospheric pressure.
  • the capsule is fixed to an element compensating for altitude.
  • the present invention relates to improvements in carburetion devices for internal combusion engines. More particularly it relates to carburetion devices, for internal combustion engines of automobile vehicles, of the type of those which comprise two separate supply circuits for fuel generally mixed with air, namely a main nozzle or jet circuit for normal operation and an idling circuit opening into the intake pipe downstream of the main throttle member actuated by the driver (at least when this member is closed). These devices include also, generally, a supply circuit called a progress" or transfer circuit opening into the intake pipe through at least one transfer orifice located so as to pass from upstream to downstream of the main throttle member when the latter opens slightly.
  • the idling circuit include at least one air intake channel and one fuel supply channel provided respectively with calibrated orifices adapted to adjust the richness of the idling mixture as well as a mixture channel at which the two preceding channels terminate, which mixture channel is provided with an adjustable throttle enabling the user to adjust the flow of the air/fuel mixture on idling and to which is connected a passage by-passing the said throttle adjustable and adapted to be opened automatically on periods of deceleration.
  • the obturating member of the by-pass passage was actuated by a suction sensitive means adapted to be connected to the zone of the supply pipe situated downstream of its main member through an electromagnetic valve controlled by an electronic device sensitive to the speed of the engine or, at least, of the vehicle driven by this engine.
  • the assembly was such that the by-pass passage was only freed through its closing member when, simultaneously, the electronic device recorded a high speed and the suction sensitive means a strong suction which corresponds to the closing of the main throttle member.
  • a carburetion device of which the idling circuit comprises not only a mixture channel at which an air supply channel and a fuel supply channel terminate, provided respectively with calibrated orifices adapted to adjust the richness of the air/fuel mixture, and which is provided with an adjustable throttle enabling the user to adjust the flow of the mixture which is delivered on idling through this mixture channel through an orifice opening into the zone of the intake pipe situated downstream of its main throttle member (at least when this member is closed) but also a passage connected to the mixture channel so as to bypass said adjustable throttle and adapted to be freed, during periods of deceleration, by a closing member which is actuated by a first suction sensitive means sensitive to the suction existing in the said zone which is transmitted to it through a member sensitive to the engine speed, which carburetion device is characterized by the fact that this latter member is constituted by a second suction sensitive means sensitive to the suction existing at one point of the intake pipe located so as to pass from downstream to upstream of the main throttle
  • the carburetion device thus defined is also characterized by the fact that the second suction sensitive means is constituted by a capsule, with an inner spring, housed in a chamber connected to the above-said zone.
  • Such a carburetion device operates correctly for a rather restricted altitude limit, but if it is adjusted to operate at sea level for example, it no longer operates correctly on arriving at altitudes comprised between 1,000 and 2,000 meters, since the device then delivers permanently through the by-pass passage held open, which is manifested by an excessive idling speed and incompatible with comfort in the use of the vehicle whose engine is supplied through the device concerned.
  • the carburetion device can also be characterized by the fact that the above-said capsule anchored on an element adapted to be displaced as a function of the difference between atmospheric pressure and the pressure existing in the above-said zone, so that, the lower the atmospheric pressure, that is to say the higher the altitude, the lower must be the pressure existing in this zone for it to be transmitted to the first suction sensitive means.
  • FIG. 1 shows in vertical diagrammatic section, a first embodiment of a carburetion device constructed according to the invention
  • FIG. shows a variation of a portion of the embodiment shown in FIG. 1;
  • FIG. 3 shows, in diagrammatic vertical section, a second embodiment of a carburetion device according to the invention
  • FIG. 4 shows curves illustrating the operation of the embodiment of FIG. 3.
  • FIG. shows a third embodiment which is a multiple carburetion device.
  • the carburetion device as a whole, this is established in any suitable manner such that it comprises as shown in FIGS. 1 to 3:
  • a supply pipe 1 connected to the intake pipe of the engine, this pipe possessing an air inlet 2 and a main throttle member (or butterfly valve) 3 actuated by the driver;
  • this is constituted by a channel, supplied with fuel by a constant level tank, which opens into the pipe 1 at the level of a venturi 6 through orifices not shown.
  • the idling orifice 4 and, on the other hand, the transfer orifices 5 through separate and distinct circuits of the main jet circuit, which separate circuits comprise each a calibrated orifice 7 or 8 for the metering of the fuel and at least one calibrated orifice 9 or 10 for the quantity control of the air, these orifices 7 to 10 serving to determine the richness of the mixtures delivered respectively through the two circuits concerned.
  • the fuel of one or other of these separate circuits is raised into the above-said tank, through a channel 11 as regards the idling circuit.
  • the calibrated orifice 7 opens into a mixture channel 12 of which the upper part communicates with the pipe 1 through the calibrated orifice 9 and which, at its lower part, opens into the pipe 1 by means of the orifice 4.
  • the second circuit comprises a descending channel 13 which communicates, at its upper part, with the air intake 2 by means of the calibrated orifice 10 and of which the lower portion opens into the pipe through the orifices 5.
  • the channel 13 of the transfer circuit is advantageously made to communicate with the pipe I, not only through the one or more transfer orifices 5, but also through an orifice 14 opening constantly downstream of the throttle member 3.
  • This orifice may be provided with adjusting means, such as a screw 15.
  • the orifice 14 has the effect of maintaining the fuel in the transfer channel 13 during idling operation.
  • the channel 12 is provided with an adjustable throttle, constituted generally by an orifice 16 in which may be displaced the end of a screw 17 immobilized, for example, by a spring 18, and there is connected onto the channel 12 a passage 19 by-passing the said adjustable throttle 16, 17 and adapted to be opened automatically on periods of decelaration.
  • an adjustable throttle constituted generally by an orifice 16 in which may be displaced the end of a screw 17 immobilized, for example, by a spring 18, and there is connected onto the channel 12 a passage 19 by-passing the said adjustable throttle 16, 17 and adapted to be opened automatically on periods of decelaration.
  • a chamber 20 bounded by a diaphragm 21 and provided with an orifice 22 forming the donwstream portion of the passage 19.
  • the diaphragm 21 bears a needle 23 which cooperates with the orifice 22 and it limits, on the opposite side to the chamber 20,
  • a second chamber 24 which can communicate through the assembly of two channels 25 and 26 with a zone of the pipe 1 situated so as to pass from downstream to upstream of the throttle member 3 when the latter is slightly opened.
  • the necdle 23 is urged to closure by a spring 27 and can be opened by the action of the suction which is exerted in the chamber 24 when, at the same time, the throttle member 3 is closed (channel 26 downstream of this member) and a valve 28, acting between the channels 25 and 26, is opened by a second suction sensitive member, when the engine speed is greater than the above-said limit (1,300 to 1,400 turns/minute, for example).
  • the chamber 24 can be connected permanently to the atmosphere, through an orifice 29 of slight cross-section, which opens for example into the pipe 1 upstream of the throttle member 3, and possibly also (as shown) through the channel 25; the permanent connection of the chamber 24 with the atmosphere could also be effected by means of the portion of the channel 12 situated upstream of the orifice 7.
  • the channel 25 may be terminated in a closed chamber 30, according to the embodiment of FIG. 1, by a diaphragm 31 of which the movable mechanism bears the valve 28.
  • This valve cooperates with a seating 32 and, according to whether it is on this seat or not, the communication between the channel 25 and the chamber 30 is cut or established.
  • This chamber communicates in addition through the channel 26 with the intake pipe 1 downstream of the throttle member 3, in the immediate proximity of the edge of the latter, at least when this member occupies its idling position.
  • a spring 33 acts on the diaphragm 31 (towards the right of FIG. 1 to maintain the valve 28 on its seating 32 as long as the suction existing in the pipe 1 downstream of the throttle member 3 is equal or less than the suction exisiting on idling.
  • a closure cover 34 in which is mounted an adjusting screw 35 acting on a spring 36 and capable of being locked for example by a check nut 37.
  • This device serves, by acting on the screw 35, to adjust, due to the spring 36, the exact tension of the spring 33 so that the latter yields as soon as the suction in the chamber 30 exceeds the value existing on idling.
  • the cover 34 is pierced by a hole 38 adapted to subject the other surface of the diaphragm 3] to atmospheric pressure.
  • the operation of the device is as follows.
  • the throttle member 3 occurs again in the same position as on idling, but the suction in the pipe 1, downstream of the throttle member 3, increases beyond the suction existing on idling and, by acting on the diaphragm 31, causes compression of the spring 33 and a displacement of small amplitude of the diaphragm 31 towards the lift of FIG. 1,
  • the richness of the mixture thus introduced into the engine is substantially the same on idling and in the course of decelerations, but the delivery is greater on decelerations, which favors combustion and reduces the level of pollutants in the exhaust gases.
  • the common orifice 22 opens, not into one of the elemental carburetors, but into a tube 45 (FIG. 5) which makes the supply pipes communicate between thesmselves such as 1 of the various carburetors, downstream of their respective throttle members such as 3.
  • the main advantage of this device is to give rise, on each deceleration, to strictly one position of the throttle member 3 which comes to rest on its stop usually provided (not shown in the FIGS.), which enables strict adjustment of the air which can pass around this throttle member and especially strict positioning of this member with respect to the transfer orifices 5 which normally occur at this moment upstream of the throttle member 3. Consequently, the latter do not participate in the supply of the engine, which would be the case if, as in most known constructions, the throttle member 3 was slightly open (from the idling position) during periods of deceleration.
  • the operation of the device of FIG. 1 is only certain on condition that the atmospheric pressure does not vary too much; in particular, when the altitude increases, operation becomes defective. It is known, in fact, that, on idling, the pressure which exists in the pipe 1, downstream of the throttle member 3, has an absolute value almost constant for a fixed altitude. Since the diaphragm is subjected to the difference between the absolute external pressure barometric pressure) and the absolute internal pressure (chamber 30), its operation varies with the barometric pressure since the internal pressure remains practically constant.
  • FIG. 2 overcomes this drawback by substituting for the diaphragm 31 a capsule 39, generally empty, whichan inner spring tends to hold at a certain length.
  • This capsule is housed inside the chamber 30 and is coupled to the valve 28.
  • the axial position of the capsule may be adjusted by means of a screw 35a which is locked on the cover 340 of the chamber 30 by means of a lock-nut 37a.
  • FIG. 2 operates like that of FIG. 1, the capsule 39 elongating under the effect of the suction existing in the pipe 1 and transmitted through the channel 26, but with this difference that its elongation and the point where it starts to operate depends little on the ambient atmospheric pressure.
  • the embodiment of FIG. 2 is consequently fool proof, for moderate variations of atmospheric pressure.
  • the value of the absolute pressure in the pipe 1, downstream of the throttle member 3 changes a little due to the fact that the exhaust of the engine is effected in a medium at lower barometric pressure, which slightly modifies the intake pressure in the pipe I.
  • the embodiment of FIG. 3 has the object of eliminating this influence of altitude.
  • the capsule is anchored on a rigid and fixed part constituted by the cover 34a of the chamber 30, in the embodiment of FIG. 3, which is apart from this identical with that of FIG. 2, the capsule 39 is anchored on a rigid part 40 which is movable as a function of the difference between the atmospheric pressure and the pressure existing in the zone of the pipe 1 situated downstream of the main throttle member 3, so that, the lower the atmospheric pressure, that is to say the higher the altitude, the lower must be the pressure existing in this zone for it to be transmitted to the first suction sensitive means, that is to say to the chamber 24.
  • the part 40 which is traversed by the screw 35a with the interposition of a sealing joint 41, is fixed in sealed manner to an element 42 adapted to be displaced or deformed with respect to the casing 43 which bounds the chamber 30 and of which it forms the sealed bottom.
  • the element 42 is preferably constituted by a metallic bellows welded through an annular edge 42a to the element 40 and through another annular edge 42b to the casing 43. In this way, the inner surface of the bellows is subjected to the pressure of the chamber 30 and its outer surface to atmospheric pressure.
  • the capsule 39 is adjusted so that the valve 28 is opened in the course of deceleration for a value of the absolute pressure equal to B and is closed for a value of this pressure equal to B,.
  • the capsule 39 is adjusted by means of the lock-nut 37a to operate at absolute pressures b and b along the origin of.curves B, and B taking into account the displacement of the bellows 42.
  • the device operates whatever the altitude and enables a suitable idling speed to be reestablished whatever the value of the atmospheric pressure, at least for altitudes normally attainable by terrestrial vehicles.
  • the invention is in no way limited to that of its methods of application, nor to its methods of production of its various parts, which have been more particularly described; it embraces, on the contrary, all variations, especially that where the bellows 42 of FIG. 3 would be replaced by any diaphragm, but the metallic bellows seems more advantageous due to the fact of its relative rigidity, since it enables a fixed point to be constituted for the capsule 39 on which can be clamped the lock-nut 37a to ensure the initial adjustment of the capsule.
  • Carburetion device comprising two separate supply circuits for fuel generally mixed with air, namely a main jet circuit for normal operation and an idling circuit both opening into the intake pipe of the device, which idling circuit comprises a mixing channel at which an air supply channel and a fuel supply channel terminate, provided respectively with calibrated orifices adapted to adjust the richness of the air/fuel mixture, and which is provided with an adjustable throttle enabling the user to adjust the flow of mixture which is sucked on idling through said mixing channel by means of an orifice opening into the zone of the intake pipe situated downstream of its main throttle member actuated by the driver, at least when said throttle member is closed, and a bypass passage connected to the mixing channel so as to bypass said adjustable throttle and adapted to be freed, during periods of deceleration, by a closing member which is actuated by a first suction sensitive means sensitive to the suction existing in said zone which is transmitted to it through a member sensitive to the speed of the engine, said speed-sensitive member being constituted by a
  • a variable volume chamber of said first suction sensitive means communicates permanently, through an orifice of small section, with a zone in which exists a pressure substantially equal to atmospheric pressure.
  • Carburetion device according to claim 1, wherein said capsule is anchored on an element adapted to be displaced as a function of the difference between atmospheric pressure and the pressure existing at said point of the intake pipe, so that the lower the atmospheric pressure the lower must be the pressure existing at said point for it to be transmitted to the first suction sensitive means.
  • Carburetion device including a casing bounding said chamber, an element adapted to be spacially modified with respect to said casing and of which it forms the sealed bottom, said element being constituted by a rigid part to which said capsule is fixed by screwing.
  • Multiple carburetion device constituted by the combination of at least two single carburetion devices according to claim 1, and including a single bypass passage opening into a tube uniting the intake pipes of the single carburetion devices, downstream of their respective main throttle members.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
US14456A 1969-03-03 1970-02-26 Carburetion devices for internal combustion engine Expired - Lifetime US3677526A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR6905748A FR2036056A5 (fr) 1969-03-03 1969-03-03
FR6933379A FR2064585A6 (fr) 1969-03-03 1969-09-30

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US3677526A true US3677526A (en) 1972-07-18

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US14456A Expired - Lifetime US3677526A (en) 1969-03-03 1970-02-26 Carburetion devices for internal combustion engine

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US (1) US3677526A (fr)
JP (1) JPS5138016B1 (fr)
DE (1) DE2008883C3 (fr)
ES (1) ES377309A1 (fr)
FR (2) FR2036056A5 (fr)
GB (1) GB1290947A (fr)
SE (1) SE351895B (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3742922A (en) * 1972-03-10 1973-07-03 Nissan Motor Multi carburetor system of variable area venturi type with auxiliary fuel supply system
US3823699A (en) * 1972-10-20 1974-07-16 Aerodex Inc Deceleration fuel flow and emission control for internal combustion engines
US3847125A (en) * 1972-01-27 1974-11-12 A Malherbe Carburetor
US3852391A (en) * 1971-03-11 1974-12-03 Nissan Motor Carburetor with deceleration circuit
US3869528A (en) * 1973-03-21 1975-03-04 Gen Motors Corp Cold transient enrichment
US3899552A (en) * 1974-03-01 1975-08-12 Universal Oil Prod Co Carburetor with automatic air-fuel ratio adjustment control
US3943899A (en) * 1973-04-06 1976-03-16 Toyo Kogyo Co., Ltd. Atmospheric pressure compensating means for an engine intake system
US3963670A (en) * 1975-03-07 1976-06-15 Acf Industries, Incorporated Integrated idle and by-pass system
US3982513A (en) * 1973-05-07 1976-09-28 Nissan Motor Co., Ltd. Carburetor for torch ignited engine
US4095567A (en) * 1975-06-26 1978-06-20 Societe Industrielle De Brevets Et D'etudes S.I.B.E. Carburation devices with idle adjustment
US4298550A (en) * 1979-01-29 1981-11-03 Aisan Industry Co., Ltd. Carburetor
US4370282A (en) * 1980-07-28 1983-01-25 Nissan Motor Company, Limited Control device for acceleration pump
US4454080A (en) * 1982-03-23 1984-06-12 Fadeipca International, Corp. Fuel flow automatic modulating and economizing carburetor jet assembly
US20050110170A1 (en) * 2003-11-21 2005-05-26 Grant Barry S. Multiple circuit - single valve metering system for carburetor

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1379783A (en) * 1971-03-11 1975-01-08 Nissan Motor Multi-carburetor system including an auxiliary fuel supply system
ZA786677B (en) * 1978-11-28 1980-02-27 E Ziniades Improvements relating to fuel saving and exhaust emission reduction
DE3261665D1 (en) * 1982-03-05 1985-02-07 Pierburg Gmbh & Co Kg Regulating screw for a mixture formation device
CN102996262B (zh) * 2012-11-28 2017-11-24 昌辉汽车电器（黄山）股份公司 一种隔膜板式怠速控制阀

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2134667A (en) * 1936-11-06 1938-10-25 Leibing Automotive Devices Inc Carburetor
US2318008A (en) * 1940-12-23 1943-05-04 Nat Devices Corp Carburetor for multicylinder internal combustion engines
US2389219A (en) * 1943-10-18 1945-11-20 George M Holley Mixture control
US2877998A (en) * 1956-06-29 1959-03-17 Holley Carburetor Co Apparatus for controlling the admission of fuel and air to an internal combustion engine
US2993485A (en) * 1959-01-12 1961-07-25 Holley Carburetor Co Intake manifold vacuum actuated fuel shut-off apparatus
US3353524A (en) * 1963-10-23 1967-11-21 Chrysler Corp Method of operating an automotive engine
US3364909A (en) * 1965-10-24 1968-01-23 Gen Motors Corp Engine exhaust emission control system having air flow control valve
US3503594A (en) * 1967-08-28 1970-03-31 Toyota Motor Co Ltd Fuel system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2134667A (en) * 1936-11-06 1938-10-25 Leibing Automotive Devices Inc Carburetor
US2318008A (en) * 1940-12-23 1943-05-04 Nat Devices Corp Carburetor for multicylinder internal combustion engines
US2389219A (en) * 1943-10-18 1945-11-20 George M Holley Mixture control
US2877998A (en) * 1956-06-29 1959-03-17 Holley Carburetor Co Apparatus for controlling the admission of fuel and air to an internal combustion engine
US2993485A (en) * 1959-01-12 1961-07-25 Holley Carburetor Co Intake manifold vacuum actuated fuel shut-off apparatus
US3353524A (en) * 1963-10-23 1967-11-21 Chrysler Corp Method of operating an automotive engine
US3364909A (en) * 1965-10-24 1968-01-23 Gen Motors Corp Engine exhaust emission control system having air flow control valve
US3503594A (en) * 1967-08-28 1970-03-31 Toyota Motor Co Ltd Fuel system

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3852391A (en) * 1971-03-11 1974-12-03 Nissan Motor Carburetor with deceleration circuit
US3847125A (en) * 1972-01-27 1974-11-12 A Malherbe Carburetor
US3742922A (en) * 1972-03-10 1973-07-03 Nissan Motor Multi carburetor system of variable area venturi type with auxiliary fuel supply system
US3823699A (en) * 1972-10-20 1974-07-16 Aerodex Inc Deceleration fuel flow and emission control for internal combustion engines
US3869528A (en) * 1973-03-21 1975-03-04 Gen Motors Corp Cold transient enrichment
US3943899A (en) * 1973-04-06 1976-03-16 Toyo Kogyo Co., Ltd. Atmospheric pressure compensating means for an engine intake system
US3982513A (en) * 1973-05-07 1976-09-28 Nissan Motor Co., Ltd. Carburetor for torch ignited engine
US3899552A (en) * 1974-03-01 1975-08-12 Universal Oil Prod Co Carburetor with automatic air-fuel ratio adjustment control
US3963670A (en) * 1975-03-07 1976-06-15 Acf Industries, Incorporated Integrated idle and by-pass system
US4095567A (en) * 1975-06-26 1978-06-20 Societe Industrielle De Brevets Et D'etudes S.I.B.E. Carburation devices with idle adjustment
US4298550A (en) * 1979-01-29 1981-11-03 Aisan Industry Co., Ltd. Carburetor
US4370282A (en) * 1980-07-28 1983-01-25 Nissan Motor Company, Limited Control device for acceleration pump
US4454080A (en) * 1982-03-23 1984-06-12 Fadeipca International, Corp. Fuel flow automatic modulating and economizing carburetor jet assembly
US20050110170A1 (en) * 2003-11-21 2005-05-26 Grant Barry S. Multiple circuit - single valve metering system for carburetor
US7168690B2 (en) * 2003-11-21 2007-01-30 Grant Barry S Multiple circuit—single valve metering system for carburetor

Also Published As

Publication number Publication date
DE2008883B2 (de) 1973-06-20
ES377309A1 (es) 1972-06-16
DE2008883C3 (de) 1974-01-17
FR2064585A6 (fr) 1971-07-23
SE351895B (fr) 1972-12-11
GB1290947A (fr) 1972-09-27
FR2036056A5 (fr) 1970-12-24
DE2008883A1 (de) 1970-09-10
JPS5138016B1 (fr) 1976-10-19

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