US3861058A - Fluidized bed grain processor - Google Patents

Fluidized bed grain processor Download PDF

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Publication number
US3861058A
US3861058A US316114A US31611472A US3861058A US 3861058 A US3861058 A US 3861058A US 316114 A US316114 A US 316114A US 31611472 A US31611472 A US 31611472A US 3861058 A US3861058 A US 3861058A
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US
United States
Prior art keywords
grain
enclosure
processor
air
walls
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
Application number
US316114A
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English (en)
Inventor
John C Whelan
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.)
California Pellet Mill Co
Original Assignee
California Pellet Mill Co
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 California Pellet Mill Co filed Critical California Pellet Mill Co
Priority to US316114A priority Critical patent/US3861058A/en
Priority to GB5832773A priority patent/GB1432859A/en
Priority to FR7345273A priority patent/FR2213473B1/fr
Priority to ES1973216421U priority patent/ES216421Y/es
Priority to BR9945/73A priority patent/BR7309945D0/pt
Priority to JP48140432A priority patent/JPS4999854A/ja
Priority to NL7317357A priority patent/NL7317357A/xx
Application granted granted Critical
Publication of US3861058A publication Critical patent/US3861058A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
    • F26B3/08—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/10—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers
    • F26B17/106—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers the drying enclosure, e.g. its axis, being substantially straight and horizontal, e.g. pneumatic drum dryers; the drying enclosure consisting of multiple substantially straight and horizontal stretches

Definitions

  • a grain processor has an enclosure with top, side and end walls and a bottom wall having a number of perforated areas spaced by an imperforate zone. A weir extends between the side walls and is located above the impcrforate zone.
  • the weir is variably spaced from the top and bottom walls.
  • a heater supplies hot air to the enclosure through the perforations. There is an air return from the enclosure to the heater. Grain is supplied to one end of the enclosure just above the bottom and is released from the other end of the enclosure.
  • Another object of the invention is to provide a grain processor in which the grain being heated is uniformly treated in a relatively short space of time.
  • Another object of the invention is to provide a grain processor in which the received grain is agitated or tumbled or intermixed as it is being heated in order that each of the individual grains receives substantially the same heating treatment.
  • Another object of the invention is to provide a grain processor through which a large quantity of grain can be processed in a relatively short time.
  • a further object of the invention is in general to provide an improved grain processor.
  • the FIGURE is a diagram, not to scale and partially in cross-section on a longitudinal vertical plane, of a grain processor constructed pursuant to the invention.
  • the grain processor can be embodied in a large number of different forms, particularly depending upon its use and environment, the source of heat, the nature and amount of grain to be treated and the like, it has successfully been incorporated in one relatively small version as disclosed herein.
  • a bin 6 or hopper or other holder to receive bulk grain in its natural condition and to hold such grain for subsequent treatment.
  • the hopper 6 discharges by gravity through a vertical duct 7 having a lateral opening 8 at one end of an enclosure, generally designated 9, and extending for a substantial width, length and height.
  • the opening 8 preferably extends across virtually the entire width of the enclosure.
  • the enclosure 9 includes a top wall 11 conveniently of sheet metal or the like properly reinforced and likewise includes a pair of side walls designated 12 as well as a pair of end walls 13 and 14.
  • the wall 13 includes the opening 8.
  • the bottom of the enclosure is bounded by a bottom wall extending under the duct 7 and being substantially flat and horizontal between the inlet 8 and an outlet 16 at the other end of the enclosure.
  • the outlet 16 opens into a discharge duct 17 containing a grain release mechanism or valve 18.
  • the bottom wall is not solid. Rather, it is provided with a plurality of areas such as 21, 22 and 23 in which the sheet of the bottom wall is pierced by a plurality of perforations 24. These are conveniently made by piercing the sheet partially to afford an opening and a lip 26 outstanding from the sheet and inclined generally upwardly and in the direction of the outlet 16.
  • the various areas 21, 22 and 23 of the perforations extend virtually entirely across the enclosure 9 and extend from the inlet 8 substantially to the outlet 16. They are also spaced apart each from the others by intervening zones 27 and 28, for example, in which the bottom sheet has no perforations but rather is imperforate or solid.
  • the locations of the solid or imperforate zones are preferably evenely spaced between the inlet and the outlet. In a practical example they are disposed approximately two feet from each other.
  • weirs 30, 31 and 32 Extending to the side walls 12 of the enclosure but spaced from the top wall 11 thereof, yet depending toward the bottom wall are weirs 30, 31 and 32.
  • the weirs 31 and 32 especially are located directly above the zones 27 and 28.
  • the weirs conveniently are metal plates designed to slide in guides 33 secured to the side 5 walls and movable with sufficient friction so that they will stay in any desired vertically adjusted position.
  • Each weir can be spaced a desired or predetermined distance from the top wall 11 and, more particularly, a predetermined distance D from the bottom wall at the subjacent zone 27 or 28 to leave an opening 34.
  • the enclosure 9 is also provided with an air outlet 36 opening from the enclosure into a duct 37 leading to the tangential inlet of a separator 38 preferably of the cyclone type.
  • the separator has a removable receiver 39 for deposited solids at its bottom.
  • the separator also has a central outlet duct 41 leading to the inlet of an air blower 42 driven by an electric motor 43.
  • the tangential outlet 44 of the blower extends through a heater 46. Air passing through the duct 44 has its temperature substantially raised in the heater and emerges from the heater at a predetermined temperature and humidity. Discharge air downstream of the heater 46 flows through a duct 47 extending to a plenum 48 at the bottom of the enclosure 9.
  • the heater 46 is started and the motor 43 is energized. Air is circulated in a substantially closed circuit. Ultimately, hot air travels through the duct 47 and into the enclosure 9 through the apertures 24 in the bottom wall 14 thereof. The air is partially directed by the lips 26 in an upward direction toward the outlet and emerges from the apertures or perforations with considerable velocity. Grain in the hopper 6 travels by gravity through the opening 8. The individual grains become entrained in the airstreams emerging from the bottom wall perforations. The grain is thus lifted upwardly and also transported forwardly. It is tumbled and agitated so that it is exposed readily and thoroughly to the hot, processing air.
  • the grain is not permitted to move directly to the outlet 16. Because of its ebullient or partially airborn condition, the grain, unless restrained, tends to travel too quickly to the outlet and so is not uniformly processed. For that reason, the grain is initially partially confined or baffled by the weir 31.
  • the air velocity and the dispositions of the structures are such that little or none of the agitated grain travels over the top of the weir 31.
  • the conditions of the structure and its operation are such that grain near the bottom of the first weir is in effect made quite fluid by the entraining air flowing through the adjusted opening 34.
  • Grain traveling from the opening 34 finds itself in a volume between the weirs 31 and 32 and is again subjected to air lifting because of the perforations 24 in the next perforate area 22. The lifting and tossing function is repeated. The further heated grain moves into another quiescent area under the weir 32 established by the imperforate zone 28. The grain, after having been tumbled in the intermediate volume and not being elevated sufficiently to travel over the top of the weir 32, finally flows under such weir through an opening 49 very much like the opening 34.
  • the opening 49 extends clear across the enclosure and takes a wide swath of grain from the intermediate compartment to the downstream compartment.
  • the size of the opening 49 is regulated by the vertical position of the weir 32 to afford the desired average depth of grain and a proper outflow of grain to the downstream side of the weir.
  • the grain is then in a third volume or compartment between the downstream side of the weir 32 and the end wall 14.
  • the grain continues to tumble and be heated.
  • the heated grain ultimately flows through the outlet 16 and into the duct 17 to travel past the valve 18 to discharge.
  • the separated or cleaned air flows out of the separator through the duct 41 and is impelled ahead by passing through the fan 42.
  • the discharge air from the fan then travels in the duct 44 and is reheated in the heater 46. This provides hot air for subsequent travel through the duct 47 and discharge from the plenum 48, as previously described.
  • the goal was to heat wheat to 315 F. with air at 600 F.
  • distance D that is, without the weirs
  • the maximum output per hour of the unit was 5,400 pounds of processed grain.
  • the output when the weirs were inserted and set at a particular depth; for example, a distance D of 1% inches between the bottom of the weir and the subjacent bottom plate 27, the output, other conditions being the same, rose to 6,400 pounds of processed grain per hour.
  • the weirs were moved even farther down to leave only a 5 1 inch gap or distance D between the bottom of the weir and the bottom wall, the output increased to 8,100 pounds of processed grain per hour.
  • This final distance D appeared to be, however, an optimum spacing under the stated operating conditions because further lowering of the weir apparently interfered unduly with lateral transfer of the grain and the total output decreased.
  • a grain processor comprising side, end and top walls partially defining an elongated enclosure; means for supplying untreated grain to one end of said enclosure; means for releasing treated grain from the other end of said enclosure; a stationary bottom wall for said enclosure having disposed therein a plurality of perforated areas spaced by at least one imperforate zone disposed between said ends; means for regulating the average depth of grain above said bottom wall including a vertically moveable weir located above each of said imperforate zones, said weir extending between said side walls and spaced from said top and bottom walls; and means for supplying fluidizing hot air to said enclosure through said perforated areas.
  • the grain processor of claim 1 wherein the means for supplying fluidizing hot air to said enclosure includes means for recycling the hot fluidizing air which has been used to treat the grain.
  • a grain processor comprising side, end, and top walls partially defining an elongated enclosure
  • a stationary bottom wall for said enclosure having disposed therein a plurality of perforated areas spaced by at least two imperforate zones disposed between the ends of said enclosure, the openings of said perforated areas including lips or air deflectors which are inclined upwardly and in a direction to deflect air toward the grain release means,
  • means for regulating the average depth of grain above said stationary bottom wall including verti- 6 cally movable weirs located above each of said imand means for supplying fluidizing hot air to said en- Perforate Zones wens extendmg bctween 531d closure through said perforated areas for treating side walls and spaced from said top and stationary bottom walls, said weirs being disposed approximately 2 feet apart and approximately 2 feet from 5 treated 531d grameach of the end walls,

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Drying Of Solid Materials (AREA)
  • Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)
  • Fertilizers (AREA)
US316114A 1972-12-18 1972-12-18 Fluidized bed grain processor Expired - Lifetime US3861058A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US316114A US3861058A (en) 1972-12-18 1972-12-18 Fluidized bed grain processor
GB5832773A GB1432859A (en) 1972-12-18 1973-12-17 Grain processor
FR7345273A FR2213473B1 (fr) 1972-12-18 1973-12-18
ES1973216421U ES216421Y (es) 1972-12-18 1973-12-18 Un aparato para el tratamiento de grano.
BR9945/73A BR7309945D0 (pt) 1972-12-18 1973-12-18 Processador de graos
JP48140432A JPS4999854A (fr) 1972-12-18 1973-12-18
NL7317357A NL7317357A (fr) 1972-12-18 1973-12-18

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US316114A US3861058A (en) 1972-12-18 1972-12-18 Fluidized bed grain processor

Publications (1)

Publication Number Publication Date
US3861058A true US3861058A (en) 1975-01-21

Family

ID=23227530

Family Applications (1)

Application Number Title Priority Date Filing Date
US316114A Expired - Lifetime US3861058A (en) 1972-12-18 1972-12-18 Fluidized bed grain processor

Country Status (7)

Country Link
US (1) US3861058A (fr)
JP (1) JPS4999854A (fr)
BR (1) BR7309945D0 (fr)
ES (1) ES216421Y (fr)
FR (1) FR2213473B1 (fr)
GB (1) GB1432859A (fr)
NL (1) NL7317357A (fr)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2654107A1 (de) * 1975-12-09 1977-06-23 Richter Gedeon Vegyeszet Wirbelschichtverfahren und einrichtung
US4167819A (en) * 1977-12-05 1979-09-18 The United States Of America As Represented By The United States Department Of Energy Pressure regulator
DE2943528A1 (de) * 1979-05-28 1980-12-11 Escher Wyss Gmbh Verfahren zu thermischer behandlung, insbesondere zum trocknen bzw. zum kalzinieren
US4492040A (en) * 1980-11-20 1985-01-08 A/S Niro Atomizer Method and apparatus for drying a pulverulent or particulate product
EP0165916A2 (fr) * 1984-06-18 1985-12-27 Kabushiki Kaisha Okawara Seisakusho Séchoir horizontal à lit fluidisé, comportant des tubes de transfert de chaleur
US5020239A (en) * 1990-06-08 1991-06-04 Wenger Manufacturing, Inc. Air suspension enrober
WO1999037374A1 (fr) * 1998-01-09 1999-07-29 Asj Holding Aps Procede et appareil servant a extraire un liquide d'une matiere particulaire
DE20307558U1 (de) 2003-05-14 2003-09-04 Heinen Trocknungstechnologie GmbH, 26316 Varel Wirbelschichtapparat
DE19700029B4 (de) * 1997-01-02 2006-03-09 Glatt Ingenieurtechnik Gmbh Wirbelschichtapparat
US20060093713A1 (en) * 2004-10-12 2006-05-04 Pesco, Inc. Heat and moisture control in agricultural-product production
US20060093718A1 (en) * 2004-10-12 2006-05-04 Jurkovich John C Agricultural-product production with heat and moisture recovery and control
US20070234587A1 (en) * 2006-04-10 2007-10-11 Woodhaven Capital Corp. Grain drying aeration system
WO2009109644A1 (fr) * 2008-03-07 2009-09-11 Shell Internationale Research Maatschappij B.V. Procédé de craquage d’une alimentation hydrocarbonée
CN101828757A (zh) * 2010-05-28 2010-09-15 中国水产科学研究院渔业机械仪器研究所 一种翻料式发酵豆粕烘干机
CN101571341B (zh) * 2009-06-11 2010-09-29 陆文光 沸腾干燥系统
CN101566422B (zh) * 2009-06-11 2010-09-29 陆文光 沸腾流化干燥设备

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK68580A (da) * 1980-02-15 1981-08-16 Niro Atomizer Ag Apparat til behandling af et pulver eller partikelformet produkt
DE3107194A1 (de) * 1981-02-26 1982-09-09 Bühler-Miag GmbH, 3300 Braunschweig Konditioniereinrichtung fuer rieselfaehiges gut
GB2124648B (en) * 1982-07-26 1986-07-16 Cpc International Inc Combined dryer/gasifier
DE4105402A1 (de) * 1991-02-21 1992-09-17 Braunschweigische Masch Bau Vorrichtung zum kuehlen von koernigen und kristallinen, zur verklebung neigenden feststoffteilchen
DE4119787A1 (de) * 1991-06-15 1992-12-17 Sagemueller Franz Gmbh Verfahren zum fortlaufenden konditionieren, insbesondere thermischen konditionieren, von schuettguetern, vorzugsweise pflanzlichen schuettguetern, wie getreide, kraeuter, tabak oder dergleichen
EP0857930A1 (fr) * 1997-02-11 1998-08-12 Allgaier-Werke GmbH & Co. KG Dispositif et procédé de séchage de particules solides humides dans des lits fluidisés
US6122841A (en) * 1998-05-07 2000-09-26 Asj Holding Aps Apparatus for the drying of moist particulate material in superheated steam

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1375080A (en) * 1918-11-14 1921-04-19 Howard F Chappell Drying finely-divided materials
US2490176A (en) * 1947-09-05 1949-12-06 William E Tomlinson Grain drier
US2797908A (en) * 1956-05-10 1957-07-02 Zubrzycki Boleslaw Joseph Zoning device for horizontal fluo-solid beds
US3304619A (en) * 1965-01-27 1967-02-21 Rudolph E Futer Method and means for changing the temperature of granular material by gas jets
US3409025A (en) * 1965-07-06 1968-11-05 Hauni Werke Koerber & Co Kg Method and apparatus for treating tobacco leaves
US3539164A (en) * 1967-04-22 1970-11-10 Kloeckner Humboldt Deutz Ag Cooler for hot lump goods,particularly cement clinker

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1128086A (fr) * 1955-06-23 1957-01-02 Procédé de traitement de grains
FR1361346A (fr) * 1963-02-12 1964-05-22 Berry Sa Ets Appareil trieur et sécheur
FR1524660A (fr) * 1967-05-26 1968-05-10 Procédé de modification de la température de matières fluides à l'aide de courants de gaz

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1375080A (en) * 1918-11-14 1921-04-19 Howard F Chappell Drying finely-divided materials
US2490176A (en) * 1947-09-05 1949-12-06 William E Tomlinson Grain drier
US2797908A (en) * 1956-05-10 1957-07-02 Zubrzycki Boleslaw Joseph Zoning device for horizontal fluo-solid beds
US3304619A (en) * 1965-01-27 1967-02-21 Rudolph E Futer Method and means for changing the temperature of granular material by gas jets
US3409025A (en) * 1965-07-06 1968-11-05 Hauni Werke Koerber & Co Kg Method and apparatus for treating tobacco leaves
US3539164A (en) * 1967-04-22 1970-11-10 Kloeckner Humboldt Deutz Ag Cooler for hot lump goods,particularly cement clinker

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2654107A1 (de) * 1975-12-09 1977-06-23 Richter Gedeon Vegyeszet Wirbelschichtverfahren und einrichtung
US4107851A (en) * 1975-12-09 1978-08-22 Richter Gedeon Vegyeszeti Gyar Rt. Method of and apparatus for fluidization
DK154955B (da) * 1975-12-09 1989-01-09 Richter Gedeon Vegyeszet Fremgangsmaade og apparat til fluidisering, fortrinsvis til toerring af styrtgods
US4167819A (en) * 1977-12-05 1979-09-18 The United States Of America As Represented By The United States Department Of Energy Pressure regulator
DE2943528A1 (de) * 1979-05-28 1980-12-11 Escher Wyss Gmbh Verfahren zu thermischer behandlung, insbesondere zum trocknen bzw. zum kalzinieren
US4492040A (en) * 1980-11-20 1985-01-08 A/S Niro Atomizer Method and apparatus for drying a pulverulent or particulate product
EP0165916A3 (en) * 1984-06-18 1987-02-04 Kabushiki Kaisha Okawara Seisakusho Horizontal fluidized-bed dryer with heat transfer tubes
EP0165916A2 (fr) * 1984-06-18 1985-12-27 Kabushiki Kaisha Okawara Seisakusho Séchoir horizontal à lit fluidisé, comportant des tubes de transfert de chaleur
US5020239A (en) * 1990-06-08 1991-06-04 Wenger Manufacturing, Inc. Air suspension enrober
DE19700029B4 (de) * 1997-01-02 2006-03-09 Glatt Ingenieurtechnik Gmbh Wirbelschichtapparat
WO1999037374A1 (fr) * 1998-01-09 1999-07-29 Asj Holding Aps Procede et appareil servant a extraire un liquide d'une matiere particulaire
US6154979A (en) * 1998-01-09 2000-12-05 Asj Holding Aps Method and apparatus for the removal of liquid from particulate material
CZ297514B6 (cs) * 1998-01-09 2007-01-03 Asj Holding Aps Způsob a zařízení k odstranění tekutiny z částicového materiálu
DE20307558U1 (de) 2003-05-14 2003-09-04 Heinen Trocknungstechnologie GmbH, 26316 Varel Wirbelschichtapparat
US20060093718A1 (en) * 2004-10-12 2006-05-04 Jurkovich John C Agricultural-product production with heat and moisture recovery and control
US7730633B2 (en) 2004-10-12 2010-06-08 Pesco Inc. Agricultural-product production with heat and moisture recovery and control
US7404262B2 (en) 2004-10-12 2008-07-29 Pesco, Inc. Heat-moisture control in agricultural-product production using moisture from water vapor extraction
US20060093713A1 (en) * 2004-10-12 2006-05-04 Pesco, Inc. Heat and moisture control in agricultural-product production
US20070234587A1 (en) * 2006-04-10 2007-10-11 Woodhaven Capital Corp. Grain drying aeration system
US7568297B2 (en) * 2006-04-10 2009-08-04 Woodhaven Capital Corp. Grain drying aeration system
CN101959589A (zh) * 2008-03-07 2011-01-26 国际壳牌研究有限公司 用于裂化烃进料的方法
WO2009109644A1 (fr) * 2008-03-07 2009-09-11 Shell Internationale Research Maatschappij B.V. Procédé de craquage d’une alimentation hydrocarbonée
US20110058992A1 (en) * 2008-03-07 2011-03-10 Hubertus Wilhelmus Albertus Dries Process for cracking a hydrocarbon feed
US8241583B2 (en) 2008-03-07 2012-08-14 Shell Oil Company Process for cracking a hydrocarbon feed
RU2483796C2 (ru) * 2008-03-07 2013-06-10 Шелл Интернэшнл Рисерч Маатсхаппий Б.В. Устройство для крекирования углеводородного сырья
CN101959589B (zh) * 2008-03-07 2013-09-18 国际壳牌研究有限公司 用于裂化烃进料的反应器组件
CN101571341B (zh) * 2009-06-11 2010-09-29 陆文光 沸腾干燥系统
CN101566422B (zh) * 2009-06-11 2010-09-29 陆文光 沸腾流化干燥设备
CN101828757A (zh) * 2010-05-28 2010-09-15 中国水产科学研究院渔业机械仪器研究所 一种翻料式发酵豆粕烘干机

Also Published As

Publication number Publication date
GB1432859A (en) 1976-04-22
ES216421U (es) 1976-08-01
FR2213473B1 (fr) 1976-11-19
BR7309945D0 (pt) 1974-08-15
JPS4999854A (fr) 1974-09-20
ES216421Y (es) 1976-12-16
NL7317357A (fr) 1974-06-20
FR2213473A1 (fr) 1974-08-02

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