CA1059964A - Installation for separating a heterogeneous product into two fractions - Google Patents
Installation for separating a heterogeneous product into two fractionsInfo
- Publication number
- CA1059964A CA1059964A CA237,671A CA237671A CA1059964A CA 1059964 A CA1059964 A CA 1059964A CA 237671 A CA237671 A CA 237671A CA 1059964 A CA1059964 A CA 1059964A
- Authority
- CA
- Canada
- Prior art keywords
- hood
- mill
- installation
- chains
- collection
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
- B03B9/06—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
- B07B9/02—Combinations of similar or different apparatus for separating solids from solids using gas currents
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
Abstract
ABSTRACT OF THE DISCLOSURE
The invention relates to an installation for separating a heterogeneous product into light and heavy fractions. The installation is especially designed for treatment of solid urban waste and it consists of a ripper mill, a collection hood, a conveyor belt, a settling cyclone and a dust collector, all arranged in series. The ripper mill is designed to rip or tear material fed into the mill, and the collection hood is fed from the exit of the mill. The conveyor belt is disposed directly beneath the mill and moves in a direction from the mill to the exit of the hood.
The invention relates to an installation for separating a heterogeneous product into light and heavy fractions. The installation is especially designed for treatment of solid urban waste and it consists of a ripper mill, a collection hood, a conveyor belt, a settling cyclone and a dust collector, all arranged in series. The ripper mill is designed to rip or tear material fed into the mill, and the collection hood is fed from the exit of the mill. The conveyor belt is disposed directly beneath the mill and moves in a direction from the mill to the exit of the hood.
Description
The present invention relates to a process and an apparatus for recuperating the light fraction of solid urban waste comprised principally of paper, cardboard, plastic and textile fibres, by means of a pneumatic system.
The current shortage and foreseeable scarcity of raw materials and energy make it necessary to attempt to re-use, wherever possible, all or part of the components of any type of waste produced by urban centres and industries.
These recuperated and classified components can be put to further use, either for recycling to their original state or for a secondary use.
Respective of solid urban waste and in accordanc~ with known analyses of composition, it is observed that an important fraction thereof, which we can call the light fraction, is comprised of paper, cardboard, plastic and textile fibres.
Separated from the remaining components (metals, glass, ferment-able organic matter and others), this fraction would represent an important source of raw material if it were used to manufac-ture paper pulp, or a possible energy source if used as fuel, or it could have other secondary uses such as, for example, transformation into building materials.
The present invention relates to a mechanical ripping or tearing process which, in combination with a pneumatic collection and conveyor system, permits recuperation of a high percentage of this light fraction.
As this is a completely new field the known devices of this type are very few. Some vertical backward flow pneumatic graders are known and also manual sorting-belts, which form part of some plants for transforming waste into organic fertiliser.
The process of this invention permits recuperation of a high percentage of this light fraction with the least amount of manual labour, since the extraction can be entirely automatic.
1~5g964 At the same time, considering its orlgin the product obtained can be of high quality, inasmuch as the impurities lt contains, proceeding from the substances ~or which this light fraction has generally served as packaging, can be regarded as minimal.
The product obtained, that is, the light fraction com-prised of paper, cardboard, plastic and textile fibres, will re-quire subsequent processes of transformation, but it already has direct intrinsic commercial value. Solid urban waste is generally collected in paper or plastic bags, and these bags hold the com-ponents in which we are interested. In other instances where waste is collected in centralised containers, all its components are mixed together very heterogeneously.
The first part of the system of the invention consists of an apparatus which tears open the containers and frees the waste, which can then be sorted.
Since the object is to recuperate the light fraction, the second part of the system of this invention consists of pneumatic separation which breaks the initial product down into two fractions: one light and the other heavy.
To carry out this process use is made, as the first device of the invention, of a mill we will call the ripper. This consists of a housing containing two shafts which rotate in opposite directions and to which some link chains are perpendi-cularly joined. The characteristics of the latter are determined by the capacity of the installation. The gap between the shafts may be controlled by any adequate system.
When the waste passes among the chains being whirled at a certain speed, its components are ripped apart, only the fragile components (glass, pottery and the like) being crushed. Simul-3~ taneously, the whirling of the chains creates the effect of a direct-drive fan aimed at the lateral exit of the mill. Extrac-- tion is made from the lower part of the mill by a conveyor belt
The current shortage and foreseeable scarcity of raw materials and energy make it necessary to attempt to re-use, wherever possible, all or part of the components of any type of waste produced by urban centres and industries.
These recuperated and classified components can be put to further use, either for recycling to their original state or for a secondary use.
Respective of solid urban waste and in accordanc~ with known analyses of composition, it is observed that an important fraction thereof, which we can call the light fraction, is comprised of paper, cardboard, plastic and textile fibres.
Separated from the remaining components (metals, glass, ferment-able organic matter and others), this fraction would represent an important source of raw material if it were used to manufac-ture paper pulp, or a possible energy source if used as fuel, or it could have other secondary uses such as, for example, transformation into building materials.
The present invention relates to a mechanical ripping or tearing process which, in combination with a pneumatic collection and conveyor system, permits recuperation of a high percentage of this light fraction.
As this is a completely new field the known devices of this type are very few. Some vertical backward flow pneumatic graders are known and also manual sorting-belts, which form part of some plants for transforming waste into organic fertiliser.
The process of this invention permits recuperation of a high percentage of this light fraction with the least amount of manual labour, since the extraction can be entirely automatic.
1~5g964 At the same time, considering its orlgin the product obtained can be of high quality, inasmuch as the impurities lt contains, proceeding from the substances ~or which this light fraction has generally served as packaging, can be regarded as minimal.
The product obtained, that is, the light fraction com-prised of paper, cardboard, plastic and textile fibres, will re-quire subsequent processes of transformation, but it already has direct intrinsic commercial value. Solid urban waste is generally collected in paper or plastic bags, and these bags hold the com-ponents in which we are interested. In other instances where waste is collected in centralised containers, all its components are mixed together very heterogeneously.
The first part of the system of the invention consists of an apparatus which tears open the containers and frees the waste, which can then be sorted.
Since the object is to recuperate the light fraction, the second part of the system of this invention consists of pneumatic separation which breaks the initial product down into two fractions: one light and the other heavy.
To carry out this process use is made, as the first device of the invention, of a mill we will call the ripper. This consists of a housing containing two shafts which rotate in opposite directions and to which some link chains are perpendi-cularly joined. The characteristics of the latter are determined by the capacity of the installation. The gap between the shafts may be controlled by any adequate system.
When the waste passes among the chains being whirled at a certain speed, its components are ripped apart, only the fragile components (glass, pottery and the like) being crushed. Simul-3~ taneously, the whirling of the chains creates the effect of a direct-drive fan aimed at the lateral exit of the mill. Extrac-- tion is made from the lower part of the mill by a conveyor belt
- 2 -105996~
which is protected from the elements propelled by the chains by a shelf consisting of two inclined planes. In this manner the heavy fraction is extracted from the mill by the conveyor belt, and the light fraction is extracted by the flow of air produced by the whirling chains, similar to a pneumatic conveying system.
According to a broad aspect of the present invention, there is provided an installation for separating a hetero-geneous substance into a light fraction and a heavy fraction, particularly for the treatment of solid urban waste. The installation comprises a chain mill formed by an open-buttomed housing containing rotatable chains for ripping and tearing materials fed into the mill. The chains are arranged to produce on rotation a flow of air which passes into an open-bottomed collection hood. A conveyor belt is disposed beneath the mill and the hood and the upper run of which is movable in a direction from the chain mill to the collection hood.
A settling cyclone is connected to an exit located in the upper part of the hood, and a dust collector is connected to the cyclone.
According to a further broad aspect of the present invention, there is provided a process of separating light and heavy fractions from a heterogeneous substance. The process comprises the steps of introducing the substance into a chain mill where the substance is subjected to the action of rotating chains. The substance is expelled from the chain mill partly by the action of the chains, partly by an airflow generated in part by the action of the chains, and partly by a conveyor. The expelled parts are subjected to pneumatic suction generated by a dust collector so that the light fraction is drawn into a settling cyclone for collection.
The remaining heavy fraction are drawn out through an exit opening on the conveyor.
which is protected from the elements propelled by the chains by a shelf consisting of two inclined planes. In this manner the heavy fraction is extracted from the mill by the conveyor belt, and the light fraction is extracted by the flow of air produced by the whirling chains, similar to a pneumatic conveying system.
According to a broad aspect of the present invention, there is provided an installation for separating a hetero-geneous substance into a light fraction and a heavy fraction, particularly for the treatment of solid urban waste. The installation comprises a chain mill formed by an open-buttomed housing containing rotatable chains for ripping and tearing materials fed into the mill. The chains are arranged to produce on rotation a flow of air which passes into an open-bottomed collection hood. A conveyor belt is disposed beneath the mill and the hood and the upper run of which is movable in a direction from the chain mill to the collection hood.
A settling cyclone is connected to an exit located in the upper part of the hood, and a dust collector is connected to the cyclone.
According to a further broad aspect of the present invention, there is provided a process of separating light and heavy fractions from a heterogeneous substance. The process comprises the steps of introducing the substance into a chain mill where the substance is subjected to the action of rotating chains. The substance is expelled from the chain mill partly by the action of the chains, partly by an airflow generated in part by the action of the chains, and partly by a conveyor. The expelled parts are subjected to pneumatic suction generated by a dust collector so that the light fraction is drawn into a settling cyclone for collection.
The remaining heavy fraction are drawn out through an exit opening on the conveyor.
3 -~OS9964 The invention will be better understood by an examination of the following description together with the accompanying drawing which illustrates a manner of arranging the elements constituting the system of the invention.
Numeral 1 in the figure represents the ripper mill housing, 2 is the feed hopper, 3 are the two shafts with their chains attached, 4 is the protecting shelf, 5 is a conveyor belt; 6 is the mill assembly with the collection hood, 7 and 8 are adjustable openings in the lateral ramps of the hood, 9 is a deflector and 10 is an exit for material not collected by the hood, arrow 11 indicates the flow of air aspirated by the settling cyclone 14, arrow 12 indicates the flow produced by the mill, and arrow 13 illustrates the flow entering through the mentioned exit 10.
Both the settling cyclone 14 and the dust collector 15 are conventional apparatus.
The second device is situated at the lateral exit of the mill (first device), which second device consists of a pneumatic collection hood connected to the settling cyclone 14, the suction or draft of which is furnished by a dust collector 15. The light material, collected in the lower part of the cyclone 14 is extracted by a compactor or other system. The collection hood forms part of the second device which completes the system. Its design must meet the following requisites:
- The assembly 6 with the mill must be hermetic, and sufficiently large to permit passage of the bulkier objects.
- Air intakes regulated by means of sliding plates are located on the lateral ramps 7 and 8 of the collection hood, and permit ~,1 proper flow control according to the characteristics of the material treated, - A deflector 9 inside the collection hood, adjustable as to length and inclination, divides the hood into two sections: the direct collection chamber and the declassified material recuper-ation chamber, - ~he hood exit 10 has a device for size adjustment according to the products treated and the operation of the recuperati~on chamber.
The phenomena achieved with this hood are the following:
The flow of air 11 sucked by the cyclone 14 is the sum of flow 12 produced by the mill and which bears part of the light fraction, plus the backward flow 13 entering the hood through its lateral exit 10 and recuperating that part of the light fraction tending to escape, The air flows entering and leaving the hood may be regu-lated with the valves located in the dust collector 15, in the settling cyclone 14 and in the hood itself, Said valves are interrelated, from the view point of the final resulting effect, Adjustment of the adjustable collection elements in the process will depend on the characteristics of the products treated, on the desired yield and on the quality of the light fractions it is desired to obtain, The system of this invention is industrially applicable in installations for treating solid urban waste to mechanize separation of the light fraction, The system or part of it may also be used for the pneu-matic separation of a combination of light and heavy fractions in any other industrial sector,
Numeral 1 in the figure represents the ripper mill housing, 2 is the feed hopper, 3 are the two shafts with their chains attached, 4 is the protecting shelf, 5 is a conveyor belt; 6 is the mill assembly with the collection hood, 7 and 8 are adjustable openings in the lateral ramps of the hood, 9 is a deflector and 10 is an exit for material not collected by the hood, arrow 11 indicates the flow of air aspirated by the settling cyclone 14, arrow 12 indicates the flow produced by the mill, and arrow 13 illustrates the flow entering through the mentioned exit 10.
Both the settling cyclone 14 and the dust collector 15 are conventional apparatus.
The second device is situated at the lateral exit of the mill (first device), which second device consists of a pneumatic collection hood connected to the settling cyclone 14, the suction or draft of which is furnished by a dust collector 15. The light material, collected in the lower part of the cyclone 14 is extracted by a compactor or other system. The collection hood forms part of the second device which completes the system. Its design must meet the following requisites:
- The assembly 6 with the mill must be hermetic, and sufficiently large to permit passage of the bulkier objects.
- Air intakes regulated by means of sliding plates are located on the lateral ramps 7 and 8 of the collection hood, and permit ~,1 proper flow control according to the characteristics of the material treated, - A deflector 9 inside the collection hood, adjustable as to length and inclination, divides the hood into two sections: the direct collection chamber and the declassified material recuper-ation chamber, - ~he hood exit 10 has a device for size adjustment according to the products treated and the operation of the recuperati~on chamber.
The phenomena achieved with this hood are the following:
The flow of air 11 sucked by the cyclone 14 is the sum of flow 12 produced by the mill and which bears part of the light fraction, plus the backward flow 13 entering the hood through its lateral exit 10 and recuperating that part of the light fraction tending to escape, The air flows entering and leaving the hood may be regu-lated with the valves located in the dust collector 15, in the settling cyclone 14 and in the hood itself, Said valves are interrelated, from the view point of the final resulting effect, Adjustment of the adjustable collection elements in the process will depend on the characteristics of the products treated, on the desired yield and on the quality of the light fractions it is desired to obtain, The system of this invention is industrially applicable in installations for treating solid urban waste to mechanize separation of the light fraction, The system or part of it may also be used for the pneu-matic separation of a combination of light and heavy fractions in any other industrial sector,
Claims (6)
1. An installation for separating a heterogeneous substance into a light fraction and a heavy fraction, particularly for the treatment of solid urban waste, comprising a chain mill formed by an open-bottomed housing containing rotatable chains for ripping or tearing material fed into the mill, said chains being arranged to produce on rotation a flow of air which passes into an open-bottomed collection hood, a conveyor belt disposed beneath said mill and said hood and the upper run of which is movable in a direction from the chain mill to the collection hood, a settling cyclone connected to an exit located in the upper part of said hood, and a dust collector connected to said cyclone.
2. An installation as claimed in claim 1, wherein the flow aspirated by the cyclone from the exit of the hood is the sum of the flow produced by the mill and a reverse flow entering the collection hood via an opening in the collection hood through which solid material not carried through the hood exit by the air flow is carried by the upper run of the conveyor.
3. An installation as claimed in claim 1, wherein the interior of the collection hood contains a deflector and the hood has adjustable air intakes.
4. An installation as claimed in claim 3, wherein the deflector is adjustable so that by adjusting the position of the deflector within the hood and regulating the size of the air intakes, it is possible to control the direction and volume of flow inside the hood, which in turn controls the quality of the light fraction collected and the output of the installation.
5. An installation as claimed in claim 1, 2 or 3, wherein the chains are mounted on one or more rotatable shafts.
6. A process of separating light and heavy fractions from a heterogeneous substance comprising introducing the substance into a chain mill where the substance is subjected to the action of rotating chains, expelling the substance from the chain mill partly by the action of the chains, partly by an airflow generated in part by the action of the chains, and partly by a conveyor, subjecting the expelled parts to pneumatic suction generated by a dust collector so that the light fraction is drawn into a settling cyclone for collection, and withdrawing the remaining heavy fraction through an exit opening on the conveyor.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES431053A ES431053A1 (en) | 1974-10-16 | 1974-10-16 | Installation for separating a heterogeneous substance into two fractions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1059964A true CA1059964A (en) | 1979-08-07 |
Family
ID=8467759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA237,671A Expired CA1059964A (en) | 1974-10-16 | 1975-10-15 | Installation for separating a heterogeneous product into two fractions |
Country Status (17)
| Country | Link |
|---|---|
| JP (2) | JPS5199367A (en) |
| AR (1) | AR210097A1 (en) |
| AT (1) | AT340843B (en) |
| BE (1) | BE834564A (en) |
| BR (1) | BR7506795A (en) |
| CA (1) | CA1059964A (en) |
| CH (1) | CH602200A5 (en) |
| DE (1) | DE2546143C3 (en) |
| DK (1) | DK141318B (en) |
| ES (1) | ES431053A1 (en) |
| FI (1) | FI58598C (en) |
| FR (1) | FR2305235A1 (en) |
| GB (1) | GB1513034A (en) |
| IT (1) | IT1043382B (en) |
| NL (1) | NL159894C (en) |
| NO (1) | NO142385C (en) |
| SE (1) | SE403260B (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1082718B (en) * | 1977-01-21 | 1985-05-21 | Fiat Spa | DOMESTIC WASTE SELECTION MACHINE |
| NL181850C (en) * | 1977-06-22 | 1987-11-16 | Esmil Bv | DEVICE FOR THE CLEANING OF PAPER SEPARATED FROM HOUSEHOLD WASTE. |
| FR2421685A1 (en) * | 1978-04-07 | 1979-11-02 | Bounet Raymond | Rotary suction drum fruit and grain separator - has rotary hood inside mesh drum discharging debris onto take=off conveyor |
| WO1992016312A1 (en) * | 1991-03-14 | 1992-10-01 | Wellman, Inc. | Method and apparatus of sorting plastic items |
| AT396878B (en) * | 1991-05-16 | 1993-12-27 | Binder Co Ag | METHOD FOR SUCTIONING FOREIGN BODIES FROM A BULK FLOW |
| ES2166674B1 (en) * | 1999-09-20 | 2003-02-16 | Rivera Ramon Segura | PROVISION FOR THE CAPTURE OF PLASTIC BAGS, APPLICABLE IN AN URBAN WASTE TREATMENT PLANT. |
| GB0613351D0 (en) | 2006-07-05 | 2006-08-16 | Fryars Thomas | Apparatus for separating waste |
| JP6669349B2 (en) * | 2016-01-15 | 2020-03-18 | 株式会社カルテックス | Powder supply device and powder supply mechanism |
| CN106542256B (en) * | 2016-11-03 | 2019-02-15 | 江苏建筑职业技术学院 | A kind of light refuse collection device of belt conveyor |
| CN107744875A (en) * | 2017-11-22 | 2018-03-02 | 贵州金鑫铝矿有限公司 | A kind of aluminum ore disintegrating machine |
| CN108636518B (en) * | 2018-05-30 | 2024-03-08 | 新乡市锦泰达冶金设备有限公司 | Collision type metal silicon powder processing method and device |
| CN110498452A (en) * | 2019-09-18 | 2019-11-26 | 重庆市九瑞粉末冶金有限责任公司 | It is a kind of to produce technology of ferrous sulfate vitriol using powder copper iron clad waste water |
| CN113663787B (en) * | 2020-10-24 | 2023-11-21 | 德清南方水泥有限公司 | Cement grinding pretreatment equipment |
| CN114160426A (en) * | 2021-12-06 | 2022-03-11 | 上海维瑞电气系统设备有限公司 | Multistage sorting unit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5044716Y2 (en) * | 1972-08-22 | 1975-12-19 |
-
1974
- 1974-10-16 ES ES431053A patent/ES431053A1/en not_active Expired
-
1975
- 1975-10-14 SE SE7511506A patent/SE403260B/en unknown
- 1975-10-15 CH CH1338175A patent/CH602200A5/xx not_active IP Right Cessation
- 1975-10-15 CA CA237,671A patent/CA1059964A/en not_active Expired
- 1975-10-15 IT IT2830275A patent/IT1043382B/en active
- 1975-10-15 DE DE2546143A patent/DE2546143C3/en not_active Expired
- 1975-10-15 NO NO753477A patent/NO142385C/en unknown
- 1975-10-15 DK DK463875AA patent/DK141318B/en not_active IP Right Cessation
- 1975-10-16 GB GB4256375A patent/GB1513034A/en not_active Expired
- 1975-10-16 AT AT789175A patent/AT340843B/en not_active IP Right Cessation
- 1975-10-16 JP JP12523075A patent/JPS5199367A/ja active Pending
- 1975-10-16 NL NL7512145A patent/NL159894C/en not_active IP Right Cessation
- 1975-10-16 BR BR7506795A patent/BR7506795A/en unknown
- 1975-10-16 FI FI752895A patent/FI58598C/en not_active IP Right Cessation
- 1975-10-16 AR AR26082775A patent/AR210097A1/en active
- 1975-10-16 BE BE160981A patent/BE834564A/en not_active IP Right Cessation
- 1975-10-16 FR FR7531624A patent/FR2305235A1/en active Granted
-
1980
- 1980-02-26 JP JP2419080U patent/JPS57915Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE2546143B2 (en) | 1977-12-08 |
| ATA789175A (en) | 1977-05-15 |
| BR7506795A (en) | 1976-08-17 |
| DK141318B (en) | 1980-02-25 |
| JPS55133246U (en) | 1980-09-20 |
| ES431053A1 (en) | 1976-11-16 |
| JPS5199367A (en) | 1976-09-01 |
| JPS57915Y2 (en) | 1982-01-07 |
| NL159894C (en) | 1979-09-17 |
| SE403260B (en) | 1978-08-07 |
| BE834564A (en) | 1976-02-16 |
| DK463875A (en) | 1976-04-17 |
| IT1043382B (en) | 1980-02-20 |
| NL159894B (en) | 1979-04-17 |
| NO142385C (en) | 1980-08-20 |
| FI752895A (en) | 1976-04-17 |
| SE7511506L (en) | 1976-04-20 |
| NO142385B (en) | 1980-05-05 |
| AT340843B (en) | 1978-01-10 |
| NO753477L (en) | 1976-04-21 |
| FR2305235B1 (en) | 1978-05-19 |
| AR210097A1 (en) | 1977-06-30 |
| DE2546143C3 (en) | 1978-08-03 |
| DK141318C (en) | 1980-08-11 |
| CH602200A5 (en) | 1978-07-31 |
| FR2305235A1 (en) | 1976-10-22 |
| DE2546143A1 (en) | 1976-04-29 |
| NL7512145A (en) | 1976-04-21 |
| FI58598C (en) | 1981-03-10 |
| GB1513034A (en) | 1978-06-01 |
| FI58598B (en) | 1980-11-28 |
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