CA1160609A - Method and a device for manufacturing partially oxidised lead dust - Google Patents
Method and a device for manufacturing partially oxidised lead dustInfo
- Publication number
- CA1160609A CA1160609A CA000375698A CA375698A CA1160609A CA 1160609 A CA1160609 A CA 1160609A CA 000375698 A CA000375698 A CA 000375698A CA 375698 A CA375698 A CA 375698A CA 1160609 A CA1160609 A CA 1160609A
- Authority
- CA
- Canada
- Prior art keywords
- drum
- guide plates
- lead
- plates
- dust
- 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
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G21/00—Compounds of lead
- C01G21/02—Oxides
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/56—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of lead
- H01M4/57—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of lead of "grey lead", i.e. powders containing lead and lead oxide
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Inorganic Chemistry (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Crushing And Grinding (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
In a process and a device for manufacturing partially oxidized lead dust from lead pieces, the natural pile of dissociated coarse and fine material formed in a rotating drum is mechanically disturbed by radially extending guide plates in the interior of a drum which plates are arranged in pairs and displaced toward each other by 180 in the direction of the circumference of the drum and the individual plates of each pair of plates are spaced axially apart, by which arrangement the efficiency of the process and the product quality are greatly improved.
In a process and a device for manufacturing partially oxidized lead dust from lead pieces, the natural pile of dissociated coarse and fine material formed in a rotating drum is mechanically disturbed by radially extending guide plates in the interior of a drum which plates are arranged in pairs and displaced toward each other by 180 in the direction of the circumference of the drum and the individual plates of each pair of plates are spaced axially apart, by which arrangement the efficiency of the process and the product quality are greatly improved.
Description
l 160609 =============================,==========================_====
A Method and a Devicefor Manufacturing Partially Oxidised Lead Dust ====_===_======================
r~ p~S~r The~invention relates to method and a device for manufacturing partially oxidi~ed lead dust, in which a charge of small pieces of lead is fed alon~ with air to a rotating drum.
In the mill known from U.S. patent 1,584,149 a charge of small pieces of lead ~ moved in a drum by rotation of the latter, whereby very fine-grained rubbed-off dust results which is removed from the mill by air. This air is either blown into the mill through nozzles or is sucked through the mill The lead dust produced in this manner is used particularly in the manufacture Or accumula-tors. However, this mode of operation requires a very high degree of energy consumption. Moreover, it has not besn possible heretofore to construct and control plants with an output of more than 250 to ~oo kg/h.
Mill methods are also known which operate according to the sieving residue method. In these cases extensive variation of the size of the manufacturing installations is possible - mills with a lead throughput of ~o to 1 J200 kg/h are known - and a more favourable degree of energy consump-tion can be achleved as oompared with the air mills, at least l 1~06~
in the case of large units. However, the quality of the dust produced is considerably lower for accumulator manufacture as regards its degree of fineness and its degree of oxidation.
A The transformation of lead pieces to oxidi~ed lead dust is known from U.S. patent 1,584,149, in which case the lead pieces are rotated together with bal-ls of steel in a pebble mill and a current of air is blown into the mill. ~ ~)R
This known method is not suitable for sufficiently contac~ing~
the dust gathering in the dead zones wi-th ~t~r, and the only disturbance Or the natural piling up of material is caused by the rotation of the reactor drum. The rate of production achieved by this method is unsatisfactory, amounting to only loo kg/h.
It is therefore the objec'v of the present invention to develop ~ method and a device which combine the advantages of the mill methods described, that is to say, which produce partially oxidi$ed lead dust, exhibiting optimum quality for battery manufacture due to its degree of fineness and its q degree of oxidationJ and which operate with favourably low energy consumption to produce as high an outpuk rate as possible.
~e~e~T
In accordance with the~ invention this object is solved by mechanically disturbing the natural pile of material forming in the drum in such a way th~t the dust is exposed to the air.
Detailed research has shown that, in the case of the known drums~ coarse and fine material will dissociate inside the rotating pile~ in which case the fine material may become concentrated both inside and at the periphery of the pile, depending on the degree of filling and speed of rotation of the drum. It is, however, particularly important for the air to be able to reach the parts of the pile where I ~OBO9 the rubbecl-off dust is concentrated, for the purpose of oxidation and to act as a carrier gas. This has proved to be the case only with the small air drums known heretofore, and it remains unsatisfactory in the case of larger drums working on the same principle, even with the most favourable adjustment of all variables. The result is that the method becomes un-balanced and uncontrolled.
By means of the present invention it is advantageously possible to control the air drum process in such a way thatdrums of almost all sizes can be securely run in stationaryequilibrium under a wide ranye of adjustments of all variables, such a degree of filling, speed of rotation, size of pieces, air through-put, and temperature. Due to the fact that the natural pile is disturbed mechanically, it is ensured tha-t the air will come into contact with the lead dust, irrespective of how the drum is run.
By way of example, the drum mayberotatedeccentrically.
In accordance with a second embodiment of the present invention the device for carrying ou-t the invention may be embodied such that guide plates or baffles are attached to the inner wall of the drum. These guide plates or baffles, which of course rotate along with the drum wall, will, when rotating, disturb the natural pile inside the drum in such a way that the air can reach the lead dust. It is of particular advantage to arrange the guide plates in pairs and displace towards each other by 180 in the direction of the circumference of the drum, in which case the individual guide plates of each pair of plates are spaced axially a certain distance apart. An unbalanced state of the drum is avoided in this way, and the desired number of pairs of guide plates disposed towards each other can be arranged so as to produce the best results.
1 ~6060~
In accordance with a third embodiment, radially extending baffles or guide plates may be attached to a shaft which extends coaxially into the drum. Problems with unbalanced states of the drum are excluded in this manner.
The drum may9 however, also be mounted e~centrically.
A
One embodiment example of the invention will now be explained with reference to the drawingJ in which:
Figure 1 is a cross-sectional view of a drum, Figure 2 is a longitudinal sectional view of a drum, Figure ~ i~ an enlarged view of a ~ide plate or baff]e, and Figure 4 is a sectional view of this baffle.
Figure 1 shows a drum 1 which is mounted, for instance, on four rollers and which is rotated by a motor (not shown). Guide plates or baffles 2 are arranged inside this drum, and, when rotating said drum, these baffles con-tinuously disturb the natural piling up of the material placed in the drum, said material consisting of lead pieces and rubbed-off dust.
As the longitudinal section shown in Figure 2 illustrates, the guide plates 2 o~ an opposite pai-r are arranged an axial distance apart. In the embodiment example illustrated, four guide plates 2 are provided, and these guide p ates 2 extend from the wall of the drum into the interior in a manner which is sufficient to always disturb the pile. The peripher~l distance between a pair of guide plates 2 amounts, as shown ~n Figures 1 and 2, to 180 , and the individual baffles or guide plates 2 of each pair are spaced axlally apart.
As shown in Figure 3, the guide plate 2 is3 by way o~ example, welded to the inner wall of the drum and has, as shown in Figure 4, a rhomboidal cross-section. The superiority of the inventive method and inventive device over that known heretofore will now be illustrated by means of the following product and output table.
Output Specific Product Quality Energy Consumption Specific Acid Ab-Sur~ace sorbency kg/h kWh/t m2/g g H?S04/kg Conventional Air Mill max. 300 3 2.5 250 Sieving Residue ~ill max. 1,200 155 1.8 220 Inventive Mill e.g. 1,200 llo ~.o 270 The following advantages must be added to those already obvious ~rom the above table:
(1) The degree of oxidation o~ the dust can be adjusted as desired within wide limits (50 to 75 ~) and can be main-tained with a narrow tolerance (+ 1 ~).
A Method and a Devicefor Manufacturing Partially Oxidised Lead Dust ====_===_======================
r~ p~S~r The~invention relates to method and a device for manufacturing partially oxidi~ed lead dust, in which a charge of small pieces of lead is fed alon~ with air to a rotating drum.
In the mill known from U.S. patent 1,584,149 a charge of small pieces of lead ~ moved in a drum by rotation of the latter, whereby very fine-grained rubbed-off dust results which is removed from the mill by air. This air is either blown into the mill through nozzles or is sucked through the mill The lead dust produced in this manner is used particularly in the manufacture Or accumula-tors. However, this mode of operation requires a very high degree of energy consumption. Moreover, it has not besn possible heretofore to construct and control plants with an output of more than 250 to ~oo kg/h.
Mill methods are also known which operate according to the sieving residue method. In these cases extensive variation of the size of the manufacturing installations is possible - mills with a lead throughput of ~o to 1 J200 kg/h are known - and a more favourable degree of energy consump-tion can be achleved as oompared with the air mills, at least l 1~06~
in the case of large units. However, the quality of the dust produced is considerably lower for accumulator manufacture as regards its degree of fineness and its degree of oxidation.
A The transformation of lead pieces to oxidi~ed lead dust is known from U.S. patent 1,584,149, in which case the lead pieces are rotated together with bal-ls of steel in a pebble mill and a current of air is blown into the mill. ~ ~)R
This known method is not suitable for sufficiently contac~ing~
the dust gathering in the dead zones wi-th ~t~r, and the only disturbance Or the natural piling up of material is caused by the rotation of the reactor drum. The rate of production achieved by this method is unsatisfactory, amounting to only loo kg/h.
It is therefore the objec'v of the present invention to develop ~ method and a device which combine the advantages of the mill methods described, that is to say, which produce partially oxidi$ed lead dust, exhibiting optimum quality for battery manufacture due to its degree of fineness and its q degree of oxidationJ and which operate with favourably low energy consumption to produce as high an outpuk rate as possible.
~e~e~T
In accordance with the~ invention this object is solved by mechanically disturbing the natural pile of material forming in the drum in such a way th~t the dust is exposed to the air.
Detailed research has shown that, in the case of the known drums~ coarse and fine material will dissociate inside the rotating pile~ in which case the fine material may become concentrated both inside and at the periphery of the pile, depending on the degree of filling and speed of rotation of the drum. It is, however, particularly important for the air to be able to reach the parts of the pile where I ~OBO9 the rubbecl-off dust is concentrated, for the purpose of oxidation and to act as a carrier gas. This has proved to be the case only with the small air drums known heretofore, and it remains unsatisfactory in the case of larger drums working on the same principle, even with the most favourable adjustment of all variables. The result is that the method becomes un-balanced and uncontrolled.
By means of the present invention it is advantageously possible to control the air drum process in such a way thatdrums of almost all sizes can be securely run in stationaryequilibrium under a wide ranye of adjustments of all variables, such a degree of filling, speed of rotation, size of pieces, air through-put, and temperature. Due to the fact that the natural pile is disturbed mechanically, it is ensured tha-t the air will come into contact with the lead dust, irrespective of how the drum is run.
By way of example, the drum mayberotatedeccentrically.
In accordance with a second embodiment of the present invention the device for carrying ou-t the invention may be embodied such that guide plates or baffles are attached to the inner wall of the drum. These guide plates or baffles, which of course rotate along with the drum wall, will, when rotating, disturb the natural pile inside the drum in such a way that the air can reach the lead dust. It is of particular advantage to arrange the guide plates in pairs and displace towards each other by 180 in the direction of the circumference of the drum, in which case the individual guide plates of each pair of plates are spaced axially a certain distance apart. An unbalanced state of the drum is avoided in this way, and the desired number of pairs of guide plates disposed towards each other can be arranged so as to produce the best results.
1 ~6060~
In accordance with a third embodiment, radially extending baffles or guide plates may be attached to a shaft which extends coaxially into the drum. Problems with unbalanced states of the drum are excluded in this manner.
The drum may9 however, also be mounted e~centrically.
A
One embodiment example of the invention will now be explained with reference to the drawingJ in which:
Figure 1 is a cross-sectional view of a drum, Figure 2 is a longitudinal sectional view of a drum, Figure ~ i~ an enlarged view of a ~ide plate or baff]e, and Figure 4 is a sectional view of this baffle.
Figure 1 shows a drum 1 which is mounted, for instance, on four rollers and which is rotated by a motor (not shown). Guide plates or baffles 2 are arranged inside this drum, and, when rotating said drum, these baffles con-tinuously disturb the natural piling up of the material placed in the drum, said material consisting of lead pieces and rubbed-off dust.
As the longitudinal section shown in Figure 2 illustrates, the guide plates 2 o~ an opposite pai-r are arranged an axial distance apart. In the embodiment example illustrated, four guide plates 2 are provided, and these guide p ates 2 extend from the wall of the drum into the interior in a manner which is sufficient to always disturb the pile. The peripher~l distance between a pair of guide plates 2 amounts, as shown ~n Figures 1 and 2, to 180 , and the individual baffles or guide plates 2 of each pair are spaced axlally apart.
As shown in Figure 3, the guide plate 2 is3 by way o~ example, welded to the inner wall of the drum and has, as shown in Figure 4, a rhomboidal cross-section. The superiority of the inventive method and inventive device over that known heretofore will now be illustrated by means of the following product and output table.
Output Specific Product Quality Energy Consumption Specific Acid Ab-Sur~ace sorbency kg/h kWh/t m2/g g H?S04/kg Conventional Air Mill max. 300 3 2.5 250 Sieving Residue ~ill max. 1,200 155 1.8 220 Inventive Mill e.g. 1,200 llo ~.o 270 The following advantages must be added to those already obvious ~rom the above table:
(1) The degree of oxidation o~ the dust can be adjusted as desired within wide limits (50 to 75 ~) and can be main-tained with a narrow tolerance (+ 1 ~).
(2) Lead types of the highest purity (e.g. fine lead in accordance with German Industrial'Standard DIN 1719) can be processed, whereas in the case of other mills it is necessary to use lead which is doped with an oxidation accelerator.
(3) A higher degree o~ ~ineness of the dust produced with t'ne inventive mill means that a considerable amount of material can be saved in the manu~acture of accumulators~ i.e. less ', mate,rial is needed to achieve a given battery capacity or a higher battery capacity is achieved with the same amount of material.
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:-
1. A method for manufacturing partially oxidized lead dust from lead pieces, comprising:
feeding a charge of small pieces of lead along with air, to a rotating drum; and mechanically disturbing, in addition to the rotation of the drum, the natural pile of dissociated coarse and fine material formed in said rotating drum in such a way that the dust abraded from the lead is exposed sufficiently to the air, wherein said step of mechanically disturbing is caused by bar-like guide plates radially extending into the pile of material and being arranged in pairs and displaced towards each other by 180° in the direction of the circumference of the drum, the individual guide plates of each pair of plates being spaced axially apart.
feeding a charge of small pieces of lead along with air, to a rotating drum; and mechanically disturbing, in addition to the rotation of the drum, the natural pile of dissociated coarse and fine material formed in said rotating drum in such a way that the dust abraded from the lead is exposed sufficiently to the air, wherein said step of mechanically disturbing is caused by bar-like guide plates radially extending into the pile of material and being arranged in pairs and displaced towards each other by 180° in the direction of the circumference of the drum, the individual guide plates of each pair of plates being spaced axially apart.
2. A method according to claim 1 wherein said step of mechanically disturbing is further caused by eccentric rotation of the drum.
3. A device for forming and partially oxidizing lead dust from lead pieces, comprising:
a rotatable drum, and radially extending bar-like guide plates provided in the interior of said drum, said plates being arranged in pairs and displaced with respect to one another by 180° in the direction of the circumference of the drum, the individual guide plates of each pair of plates being spaced axially apart.
a rotatable drum, and radially extending bar-like guide plates provided in the interior of said drum, said plates being arranged in pairs and displaced with respect to one another by 180° in the direction of the circumference of the drum, the individual guide plates of each pair of plates being spaced axially apart.
4. A device according to claim 3, wherein said guide plates are attached to the inner wall of said drum.
5. A device according to claim 3, wherein said guide plates are attached to a shaft which extends coaxially into said drum.
6. A device according to any one of claims 3 to 5, wherein said guide plates have a rhomboidal cross-section.
7. A device according to claim 3, wherein the drum is mounted for rotation eccentrically.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19803015022 DE3015022A1 (en) | 1980-04-18 | 1980-04-18 | METHOD AND DEVICE FOR PRODUCING PARTLY OXIDIZED LEAD DUST |
| DEP3015022.2-41 | 1980-04-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1160609A true CA1160609A (en) | 1984-01-17 |
Family
ID=6100414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000375698A Expired CA1160609A (en) | 1980-04-18 | 1981-04-16 | Method and a device for manufacturing partially oxidised lead dust |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US4412658A (en) |
| EP (1) | EP0038517B1 (en) |
| JP (1) | JPS56160325A (en) |
| AR (1) | AR228150A1 (en) |
| AT (1) | ATE14415T1 (en) |
| BR (1) | BR8004528A (en) |
| CA (1) | CA1160609A (en) |
| DE (2) | DE3015022A1 (en) |
| ES (1) | ES8202768A1 (en) |
| MX (1) | MX155731A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115847200B (en) * | 2022-12-08 | 2025-09-23 | 江西金德铅业股份有限公司 | A lead powder grinding machine with cutter grinding function |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR622223A (en) * | 1927-05-25 | |||
| US1584149A (en) * | 1922-01-30 | 1926-05-11 | Shimadzu Genzo | Method of manufacturing metal powder |
| FR557999A (en) * | 1922-02-14 | 1923-08-20 | Furnace for the continuous industrial manufacture of lead oxides | |
| US1888823A (en) * | 1924-03-29 | 1932-11-22 | Clarence A Hall | Lead oxide powder and method of making the same |
| FR580755A (en) * | 1924-04-25 | 1924-11-15 | Lead oxide manufacturing process | |
| FR631725A (en) * | 1926-06-25 | 1927-12-26 | Gamichon | Improvements to rotary kilns for the industrial manufacture of lead oxides |
| US1961296A (en) * | 1930-07-25 | 1934-06-05 | Lyuho S Ishimura | Production of lead powder |
| CH189641A (en) * | 1935-01-24 | 1937-03-15 | Prest O Lite Storage Battery C | A method and apparatus for producing lead oxide in powder form. |
| US2555171A (en) * | 1947-05-20 | 1951-05-29 | Weston David | Material reduction mill |
| DE954665C (en) * | 1952-12-11 | 1956-12-20 | Hans Rusche Dipl Ing | Tube mill in which the lining is provided with wedge-shaped projections |
| NL287430A (en) * | 1962-01-05 | |||
| FR1399784A (en) * | 1964-04-17 | 1965-05-21 | Ass Elect Ind | Process for the preparation of powdered lead oxide |
| SU360971A1 (en) * | 1971-02-11 | 1972-12-07 | Государственный всесоюзный научно исследовательский институт цементной промышленности | ARMORED DRAFT MILLS OF SELF-MILLING |
| US4003164A (en) * | 1974-04-22 | 1977-01-18 | The Carborundum Company | Workpiece treating barrel |
-
1980
- 1980-04-18 DE DE19803015022 patent/DE3015022A1/en not_active Ceased
- 1980-07-21 BR BR8004528A patent/BR8004528A/en not_active IP Right Cessation
-
1981
- 1981-04-10 MX MX186807A patent/MX155731A/en unknown
- 1981-04-13 US US06/253,532 patent/US4412658A/en not_active Expired - Fee Related
- 1981-04-14 AT AT81102860T patent/ATE14415T1/en not_active IP Right Cessation
- 1981-04-14 AR AR284975A patent/AR228150A1/en active
- 1981-04-14 DE DE8181102860T patent/DE3171460D1/en not_active Expired
- 1981-04-14 EP EP81102860A patent/EP0038517B1/en not_active Expired
- 1981-04-15 ES ES501452A patent/ES8202768A1/en not_active Expired
- 1981-04-16 CA CA000375698A patent/CA1160609A/en not_active Expired
- 1981-04-17 JP JP5727381A patent/JPS56160325A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| ES501452A0 (en) | 1982-02-16 |
| EP0038517A1 (en) | 1981-10-28 |
| US4412658A (en) | 1983-11-01 |
| ES8202768A1 (en) | 1982-02-16 |
| AR228150A1 (en) | 1983-01-31 |
| DE3171460D1 (en) | 1985-08-29 |
| MX155731A (en) | 1988-04-21 |
| JPS56160325A (en) | 1981-12-10 |
| BR8004528A (en) | 1982-03-16 |
| EP0038517B1 (en) | 1985-07-24 |
| DE3015022A1 (en) | 1981-10-22 |
| ATE14415T1 (en) | 1985-08-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |