WO1993014873A1 - Grinding mill for fodder and similar feeds - Google Patents
Grinding mill for fodder and similar feeds Download PDFInfo
- Publication number
- WO1993014873A1 WO1993014873A1 PCT/ES1992/000009 ES9200009W WO9314873A1 WO 1993014873 A1 WO1993014873 A1 WO 1993014873A1 ES 9200009 W ES9200009 W ES 9200009W WO 9314873 A1 WO9314873 A1 WO 9314873A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mill
- feed
- product
- housing
- screen
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
- B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
- B02C18/08—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within vertical containers
- B02C18/10—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within vertical containers with drive arranged above container
Definitions
- the present specification refers to a mill for feed and food products, of the type that comprises a structural housing in the form of a hopper.
- the aforementioned hopper is closed by a lid, in which there is a screening sieve inside, which in conjunction with this defines a flat cylindrical volume, inside which one or more hammer rotors or fixed blades that rotate are housed. mounted on a vertical axis supported by bearings and which receives the movement of a motor placed on the upper part of the cover.
- On the upper part of this casing there are one or more feeding hoppers provided with an adjustable closure and equipped with forced feeding devices (screw-auger, conveyor belt, vibrator, etc ...) regulated by an electronic variator, which allow the controlled feeding of the mill.
- the product is introduced through these hoppers into the screen, where it is repeatedly struck by the hammers or blades and against the screen itself, until it is reduced to a sufficient extent to pass through the holes in the screen.
- the primary objective of the present invention is to provide a mill that can grind any type of brittle products, even from the two groups mentioned above, incorporating for it the improvements object of the present invention with the help of the following description made on the basis of to a practical example of realization, which has been presented in the attached plans, in which:
- Figure 1 shows a schematic elevation view, diametrically sectioned, of a mill that includes the improvements introduced here.
- the mill is structured by one or more vertical axes (1) that include one or more hammer rotors (2) inserted inside a circular screen (3), the product receiving superiorly from one or more hoppers (4).
- the path that the product travels before entering the grinding chamber begins in the magnetic separator (5) where the product, when passing through it, is free of ferrous-type metallic impurities, subsequently and by means of Inclined ducts the product to be milled accesses the forced feeding system (6), which, automatically and controlled, transports it to the input hoppers (4).
- the product is hit by hammers or blades (7), throwing it strongly against the locks (10) and walls of the screen (3) until the particle size achieved by the particles is less than the holes of the same and allow the passage of the crushed product to the receiving hopper (8) that defines the mill's own casing.
- the rotor (2) In order to achieve a correct distribution of the product in the grinding chamber, the rotor (2) has been fitted in its upper part with fixed blades (9) placed radially that, at the same time that they uniformly distribute the product, act as hammers making a primary break of it.
- the rotor (2) In order to optimize the grinding action and to avoid that the product rotates by sliding through the inner periphery of the screen (3) as a consequence of the rotational inertia of the rotor (2) and the produced centripetal force, they are arranged in the inside periphery of the screen some metal locks (10) that bounce the product again against the hammers or blades (7) increasing the energy efficiency of the mill.
- a set of scraper blades are arranged radially and at the bottom of the rotor (2) that throw the product out of the screen (3) thus maintaining a maximum grinding surface and preventing jams in the mill.
- a support structure (11) has been arranged that allows a vertical movement of the screen parallel to the axis of the mill by means of pneumatic cylinders (12). This facilitates the assembly and disassembly of screens for cleaning or inspection without making it tiresome for the user.
- This anchoring system is equipped with a safety pressure switch that automatically stops the operation of the mill when it detects a lack of pressure in the cylinders in order to avoid mishaps due to the movement of the screen (3).
- the casing in the upper area corresponding to the support-cover (13), has a partition ( 14) on all the sides or at least on some of them, which defines between it and the housing a chamber whose entrance is defined by a small lower entrance.
- This chamber is accessed through a tube (15) connected to a centrifugal extractor (16) and to a settling cyclone (17).
- the extractor generically referenced as (16) in the figure, sucks the existing gas inside the mill without dragging more than a tiny amount of crushed product particles. These particles fall from the extractor (16) and from the decanter clone (17) by means of two alveolar valves (18) to a conveyor (19) that evacuates the ground product from the hopper.
- This hot air evacuation system is regulated and commanded by a thermostat that, when detecting a previously programmed temperature and considered critical, starts the system.
- a thermostat that, when detecting a previously programmed temperature and considered critical, starts the system.
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Pulverization Processes (AREA)
- Crushing And Grinding (AREA)
- Disintegrating Or Milling (AREA)
- Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)
- Feeding And Watering For Cattle Raising And Animal Husbandry (AREA)
Abstract
Mill installation for fodder and feed products of the type comprising a structural frame configured like a hopper (8). In the top part (13) of said frame there are provided one or more feeding hoppers (4) provided with an adjustable closure and having forced feed devices (6) controlled by means of an electronic variator which ensures the controlled feed of the mill. Said mill grind any type of brittle products.
Description
Molino para piensos y similares Feed mill and the like
La presente memoria descriptiva, como su nombre indica se refiere a un molino para piensos y productos alimenticios, del tipo de los que comprende una carcasa estructural en forma de tolva. The present specification, as its name indicates, refers to a mill for feed and food products, of the type that comprises a structural housing in the form of a hopper.
En la actual idad el aprovechamiento para piensos de determinados productos alimenticios para la especie humana, generalmente realizados con un elevado porcentaje de cereales, y que ya no están en óptimas condiciones para el consumo humano, es cada ves más frecuente. No obstante, la molturación de galletas, panecillos, o incluso otro tipo de fibras vegetales, presentan importantes problemas si se introducen directamente en un molino, ya que en general estos componentes tienen también materia grasa y no son tan frágiles como los cereales, produciéndose entonces una pasta que dificilmente saldrá por los orificios de la criba provocando el atasco o incluso la destrucción del molino. At present, the use of certain food products for the human species, generally made with a high percentage of cereals, and that are no longer in optimal conditions for human consumption, is increasingly frequent. However, the milling of biscuits, rolls, or even other types of vegetable fibers, present major problems if they are introduced directly into a mill, since in general these components also have fat and are not as fragile as cereals, thus producing a paste that will hardly come out through the holes in the screen, causing the jam or even the destruction of the mill.
Por otra parte, también es sabido que en la molturación de este tipo de componentes se produce una fuerte elevación de la temperatura generándose gran cantidad de gases que es preciso eliminar. On the other hand, it is also known that in the grinding of this type of components a strong rise in temperature occurs, generating a large amount of gases that must be eliminated.
La citada tolva, está sueriormente cerrada por una tapa, en la cual se dispone interiormente de una criba de tamizado, que en conjunción con esta define un volumen cilindrico plano, en cuyo interior se aloja uno o más rotores de martillos o cuchillas fijas que giran montados en un eje vertical apoyado en rodamientos y que recibe el movimiento de un motor colocado en la parte superior de la tapa.
Por la parte superior de esta carcasa se disponen una o más tolvas de alimentación provistas de un cierre regulable y dotadas de dispositivos de alimentación forzada (tornillo-sinfin, cinta transportadora, vibrador, etc...) regulados por un variador electrónico, que permiten la alimentación controlada del molino. The aforementioned hopper is closed by a lid, in which there is a screening sieve inside, which in conjunction with this defines a flat cylindrical volume, inside which one or more hammer rotors or fixed blades that rotate are housed. mounted on a vertical axis supported by bearings and which receives the movement of a motor placed on the upper part of the cover. On the upper part of this casing there are one or more feeding hoppers provided with an adjustable closure and equipped with forced feeding devices (screw-auger, conveyor belt, vibrator, etc ...) regulated by an electronic variator, which allow the controlled feeding of the mill.
Evidentemente, se introduce por estas tolvas el producto en el interior de la criba, donde es golpeado repetidas veces por los martillas o cuchillas y contra la propia criba, hasta ser reducido a una medida suficiente como para atravesar los orificios de la misma. Obviously, the product is introduced through these hoppers into the screen, where it is repeatedly struck by the hammers or blades and against the screen itself, until it is reduced to a sufficient extent to pass through the holes in the screen.
Así pues, el objetivo primordial de la presente invención es proveer un molino que pueda moler cualquier tipo de productos quebradizos, incluso de los dos grupos antes mencionados, incorporando para ello los perfeccionmientos objeto de la presente invención con ayuda de la descripción siguiente realizada en base a un ejemplar práctico de realización, que se ha presentado en los planos anexos, en el que: Thus, the primary objective of the present invention is to provide a mill that can grind any type of brittle products, even from the two groups mentioned above, incorporating for it the improvements object of the present invention with the help of the following description made on the basis of to a practical example of realization, which has been presented in the attached plans, in which:
La figura 1 muestra una vista esquemática en alzado, seccionada diametralmente, de un molino que incluye los perfeccionamientos aqui introducidos. como ya se ha mencionado anteriormente el molino queda estructurado por uno o más ejes verticales (1) que incluyen uno o más rotores de martillos (2) introducidos en el interior de una criba circular (3), recibiendo superiormente el producto desde una o más tolvas (4). El camino que recorre el producto antes de entrar en la cámara de molturación se inicia en el separador magnético (5) donde el producto, al atravesarlo, queda libre de impurezas metálicas de tipo ferroso, posteriormente y por medio de
conductos inclinados el producto a molturar accede al sistema de alimentación forzada (6), el cual, de forma automática y controlada, lo transporta hasta las tolvas de entrada (4). Una vez dentro de la criba (3) el producto es golpeado por los martillos o cuchillas (7) lanzándolo fuertemente contra las trabas (10) y paredes de la criba (3) hasta que la granulometría alcazada por las partículas sea menor que los orificios de la misma y permita el paso del producto triturado a la tolva de recepción (8) que define la propia carcasa del molino. Figure 1 shows a schematic elevation view, diametrically sectioned, of a mill that includes the improvements introduced here. as previously mentioned, the mill is structured by one or more vertical axes (1) that include one or more hammer rotors (2) inserted inside a circular screen (3), the product receiving superiorly from one or more hoppers (4). The path that the product travels before entering the grinding chamber begins in the magnetic separator (5) where the product, when passing through it, is free of ferrous-type metallic impurities, subsequently and by means of Inclined ducts the product to be milled accesses the forced feeding system (6), which, automatically and controlled, transports it to the input hoppers (4). Once inside the screen (3), the product is hit by hammers or blades (7), throwing it strongly against the locks (10) and walls of the screen (3) until the particle size achieved by the particles is less than the holes of the same and allow the passage of the crushed product to the receiving hopper (8) that defines the mill's own casing.
Con el fin de lograr una correcta distribución del producto en la cámara de molturación se ha dotado al rotor (2) en su parte superior de unas cuchillas fijas (9) colocadas radialmente que, al mismo tiempo que distribuyen uniformemente el producto, actúan como martillos realizando un rompimiento primario del mismo. Con el fin de optimizar la accicon de molturar y para evitar que el producto gire deslizando por la poeriferia interior de la criba (3) como consecuencia de la inercia de giro del rotor (2) y de la fuerza centrípeta producida, se disponen en la periferia interior de la criba unas trabas metálicas (10) que hacen rebotar el producto de nuevo contra los martillos o cuchillas (7) aumentando el rencimiento energético del molino. In order to achieve a correct distribution of the product in the grinding chamber, the rotor (2) has been fitted in its upper part with fixed blades (9) placed radially that, at the same time that they uniformly distribute the product, act as hammers making a primary break of it. In order to optimize the grinding action and to avoid that the product rotates by sliding through the inner periphery of the screen (3) as a consequence of the rotational inertia of the rotor (2) and the produced centripetal force, they are arranged in the inside periphery of the screen some metal locks (10) that bounce the product again against the hammers or blades (7) increasing the energy efficiency of the mill.
Del mismo modo, y para evitar que el producto quede estático (2) en el fondo de la criba (3), se dispone radialmente y en la parte inferior del rotor (2) de un confunto de láminas rascadoras que lanzan el producto fuera de la criba (3) manteniendo de esta forma una máxima superficie de molturación e impidiendo atascos en el molino. In the same way, and to avoid that the product remains static (2) at the bottom of the screen (3), a set of scraper blades are arranged radially and at the bottom of the rotor (2) that throw the product out of the screen (3) thus maintaining a maximum grinding surface and preventing jams in the mill.
Con el fin de evitar anclajes difíciles e incómodos de la criba (3) con la. tapa-soporte del molino, se ha dispuesto una estructura de sustentación (11) que permite
un movimiento vertical de la criba paralelo al eje del molino por medio de unos cilindros neumáticos (12). De esta forma se facilita el montaje y desmontaje de cribas para limpieza o inspección sin hacerlo fatigoso para el usuario. Este sistema de anclaje va dotado de un presostato de seguridad que detiene automáticamente el funcionamiento del molino cuando detecta una falta de presión en los cilindros en evitación de percances debidos al movimiento de la criba (3). Para evitar una elevaciòn de la temperatura en el interior del molino y facilitar la extracción de los gases calientes que se mencionaban al proncipio de esta memoria, la carcasa, en la zona superior correspondiente al soporte-tapa (13), dispone de un tabique (14) en todos los laterales o al menos en alguno de ellos, que define entre éste y la carcasa una cámara cuya entrada está definida por una pequeña entrada inferior. A esta cámara se accede mediante un tubo (15) conectado a un extractor centrífugo (16) y a un ciclón de decantación (17). El extractor referenciado genéricamente como (16) en la figura, realiza una succión del gas existente en el interior del molino sin arrastrar más que una ínfima cantidad de partículas de producto triturado. Estas partículas caen del extractor (16) y del ci clón decantador (17) por medio de sendas válvulas alveolares (18) aun transportador (19) que evacúa de la tolva el producto molturado. In order to avoid difficult and uncomfortable anchorages of the screen (3) with the. cover-support of the mill, a support structure (11) has been arranged that allows a vertical movement of the screen parallel to the axis of the mill by means of pneumatic cylinders (12). This facilitates the assembly and disassembly of screens for cleaning or inspection without making it tiresome for the user. This anchoring system is equipped with a safety pressure switch that automatically stops the operation of the mill when it detects a lack of pressure in the cylinders in order to avoid mishaps due to the movement of the screen (3). In order to avoid a rise in temperature inside the mill and to facilitate the extraction of the hot gases mentioned in the foregoing of this report, the casing, in the upper area corresponding to the support-cover (13), has a partition ( 14) on all the sides or at least on some of them, which defines between it and the housing a chamber whose entrance is defined by a small lower entrance. This chamber is accessed through a tube (15) connected to a centrifugal extractor (16) and to a settling cyclone (17). The extractor, generically referenced as (16) in the figure, sucks the existing gas inside the mill without dragging more than a tiny amount of crushed product particles. These particles fall from the extractor (16) and from the decanter clone (17) by means of two alveolar valves (18) to a conveyor (19) that evacuates the ground product from the hopper.
Este sistema de evacuación de aire caliente se halla regulado y comandado por un termstato que al detectar una temperatura previamente programada y considerada como crítica pone en funcionamiento el sistema. De este modo, al evitar altas temperaturas en el producto molturado, se erradica totalmente la posibilidad de formación de hongos y otro tipo de microorganismos que deteriorarían los productos molturados.
Se obtiene así un molino, de realización constructiva sencilla, que puede triturar o moler cualquier componente, además de todo tipo de cereales, proporcionando un gran rendimiento funcional con un mínimo consumo energético, por lo que adquiere el carácter de preferente sobre otro tipo de molinos ya conocidos. This hot air evacuation system is regulated and commanded by a thermostat that, when detecting a previously programmed temperature and considered critical, starts the system. In this way, by avoiding high temperatures in the milled product, the possibility of the formation of fungi and other types of microorganisms that would deteriorate the milled products is totally eradicated. In this way, a mill is obtained, with a simple construction, which can crush or grind any component, in addition to all types of cereals, providing great functional performance with minimal energy consumption, which is why it acquires the preferred character over other types of mills. already known.
La descripción y dibujos que anteceden han expuesto una forma de realización preferida del objeto de esta invención, quedando bien claro que no se trata más que de un ejemplo y que caualesquiera otras formas, proporciones, disposiciones materiales en las que se construya el molino para piensos o similares podrán ser adoptadas siempre y cuando dichas alteraciones no varíen sustancialmente las características del invento que se reivindican a continuación:
The foregoing description and drawings have set forth a preferred embodiment of the object of this invention, making it quite clear that this is only an example and that any other shapes, proportions, material arrangements in which the feed mill is constructed or similar may be adopted as long as said alterations do not substantially vary the characteristics of the invention that are claimed below:
Claims
1.- Molino para piensos y similares que comprende una linea de producción y que tiene carcasa estructural en forma de tolva, caracterizada porque tiene una tapa para cerrarla superiormente, una criba de tamizado que define un volumen cilindrico plano. 1.- Feed mill and the like that includes a production line and that has a structural housing in the form of a hopper, characterized in that it has a lid to close it superiorly, a sieve screen that defines a flat cylindrical volume.
2.- Molino para piensos y similares, según la reivindicación anterior, caracterizado porque por la parte superior de esta carcasa se disponen una o más tolvas de alimentación provistas de un cierre regulable y dotadas de dispositivos de alimentación forzada, regulados por un variador electrónico, que permiten la alimentación controlada del molino. 2. Feed mill and the like according to the preceding claim, characterized in that one or more feed hoppers provided with an adjustable closure and equipped with forced feeding devices, regulated by an electronic variator, are arranged on the top of this housing. that allow the controlled feeding of the mill.
3.- Molino para piensos y similares, según las reivindicaciones anteriores, caracterizado porque queda estructurado por uno o más ejes verticales que incluyen uno o más rotores de martillos introducidos en el interior de una criba circular, recibiendo superiormente el producto desde una o más tolvas. 3. Feed mill and the like according to the preceding claims, characterized in that it is structured by one or more vertical shafts that include one or more hammer rotors inserted inside a circular sieve, receiving the product from one or more hoppers superiorly .
4.- Molino para piensos y similares, según las reivindicaciones anteriores, caracterizado porque la carcasa en la zona superior dispone de un tabique para evitar la temperatura alta en el interior y facilitar la extracción de los gases calientes. 4. Feed mill and the like according to the preceding claims, characterized in that the housing in the upper area has a partition to avoid high temperature inside and facilitate the extraction of hot gases.
5.- "MOLINO PARA PIENSOS Y SIMILARES". 5.- "MILL FOR FEED AND SIMILAR".
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS904251A CZ279261B6 (en) | 1990-07-24 | 1990-08-31 | Disintegrating device for foodstuffs, fodder and like materials |
| PCT/ES1992/000009 WO1993014873A1 (en) | 1990-07-24 | 1992-01-22 | Grinding mill for fodder and similar feeds |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES9001990A ES2025898A6 (en) | 1990-07-24 | 1990-07-24 | Mill for animal feedstuffs and the like |
| PCT/ES1992/000009 WO1993014873A1 (en) | 1990-07-24 | 1992-01-22 | Grinding mill for fodder and similar feeds |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1993014873A1 true WO1993014873A1 (en) | 1993-08-05 |
Family
ID=8268284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/ES1992/000009 WO1993014873A1 (en) | 1990-07-24 | 1992-01-22 | Grinding mill for fodder and similar feeds |
Country Status (3)
| Country | Link |
|---|---|
| CZ (1) | CZ279261B6 (en) |
| ES (1) | ES2025898A6 (en) |
| WO (1) | WO1993014873A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113976264A (en) * | 2021-10-26 | 2022-01-28 | 徐州览智生物研究院有限公司 | Crushing apparatus is put in to fodder ration |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2043478B1 (en) * | 1991-03-14 | 1994-06-16 | Palacios M Luz Reinares | MILL FOR FEED AND SIMILAR. |
| ES2149673B1 (en) * | 1998-01-16 | 2001-05-16 | Talleres Clavijo S L | EQUIPMENT FOR CRUSHING AND MIXING OF PRODUCTS IN GRAIN. |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2609152A (en) * | 1950-06-17 | 1952-09-02 | Massey Harris Co Ltd | Vertically arranged hammer mill |
| FR2010663A1 (en) * | 1968-06-11 | 1970-02-20 | Leeningen Johannes Van | |
| DE2639888A1 (en) * | 1975-09-08 | 1977-03-17 | Saeby Jernstoberi Maskin | Centrifugal mill for grain - has four carrier arms with cutter blades which enclose 45 degree angle with their corresponding radii |
| FR2387082A1 (en) * | 1977-04-14 | 1978-11-10 | Colmant Cuvelier | CRUSHING DEVICE |
| DE3636869A1 (en) * | 1985-11-11 | 1987-05-21 | Maskinfabrikken Skiold Saeby A | Beating arm mill |
| DE8804662U1 (en) * | 1987-04-09 | 1988-07-07 | Martinez Aranda, Santiago, Zaragoza | Hammer mill |
-
1990
- 1990-07-24 ES ES9001990A patent/ES2025898A6/en not_active Expired - Fee Related
- 1990-08-31 CZ CS904251A patent/CZ279261B6/en unknown
-
1992
- 1992-01-22 WO PCT/ES1992/000009 patent/WO1993014873A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2609152A (en) * | 1950-06-17 | 1952-09-02 | Massey Harris Co Ltd | Vertically arranged hammer mill |
| FR2010663A1 (en) * | 1968-06-11 | 1970-02-20 | Leeningen Johannes Van | |
| DE2639888A1 (en) * | 1975-09-08 | 1977-03-17 | Saeby Jernstoberi Maskin | Centrifugal mill for grain - has four carrier arms with cutter blades which enclose 45 degree angle with their corresponding radii |
| FR2387082A1 (en) * | 1977-04-14 | 1978-11-10 | Colmant Cuvelier | CRUSHING DEVICE |
| DE3636869A1 (en) * | 1985-11-11 | 1987-05-21 | Maskinfabrikken Skiold Saeby A | Beating arm mill |
| DE8804662U1 (en) * | 1987-04-09 | 1988-07-07 | Martinez Aranda, Santiago, Zaragoza | Hammer mill |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113976264A (en) * | 2021-10-26 | 2022-01-28 | 徐州览智生物研究院有限公司 | Crushing apparatus is put in to fodder ration |
| CN113976264B (en) * | 2021-10-26 | 2022-11-04 | 徐州览智生物研究院有限公司 | Crushing apparatus is put in to fodder ration |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2025898A6 (en) | 1992-04-01 |
| CZ279261B6 (en) | 1995-03-15 |
| CS425190A3 (en) | 1992-02-19 |
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