CA1129329A - Method and device for automatically cleaning the air nozzles in a waste liquor combustion furnace - Google Patents
Method and device for automatically cleaning the air nozzles in a waste liquor combustion furnaceInfo
- Publication number
- CA1129329A CA1129329A CA310,845A CA310845A CA1129329A CA 1129329 A CA1129329 A CA 1129329A CA 310845 A CA310845 A CA 310845A CA 1129329 A CA1129329 A CA 1129329A
- Authority
- CA
- Canada
- Prior art keywords
- lance
- nozzle
- gap
- furnace
- orifice
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L1/00—Passages or apertures for delivering primary air for combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M9/00—Baffles or deflectors for air or combustion products; Flame shields
- F23M9/02—Baffles or deflectors for air or combustion products; Flame shields in air inlets
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Incineration Of Waste (AREA)
- Paper (AREA)
- Cleaning In General (AREA)
- Cleaning Or Drying Semiconductors (AREA)
- Drying Of Solid Materials (AREA)
- Spray Control Apparatus (AREA)
- Treatment Of Fiber Materials (AREA)
Abstract
ABSTRACT
The invention relates to a method and a device for automatic-ally cleaning the air nozzles in waste liquor combustion furn-aces.A rod-shaped lance is caused to move in the gap-shaped nozzle, so that the free end of the lance is moved from a starting position in the nozzle and outside of the combustion chamber to one short side of the gap and out through the gap, along the gap with the end outside the same all the way to the other short side of the gap and thereafter returns to the start-ing position.
The invention relates to a method and a device for automatic-ally cleaning the air nozzles in waste liquor combustion furn-aces.A rod-shaped lance is caused to move in the gap-shaped nozzle, so that the free end of the lance is moved from a starting position in the nozzle and outside of the combustion chamber to one short side of the gap and out through the gap, along the gap with the end outside the same all the way to the other short side of the gap and thereafter returns to the start-ing position.
Description
1~2~a329 Method and device for automatically cleaning the air nozzles in a waste liquor combustion furnace This invention relates to a method and a device for solving in waste liquor combustion furnaces the problem of keeping the air nozzles automatically clean from precipitations formed at the combustion of waste liquor and obstructing the supply of combustion air.
Several ways of solvin~ this problem are known in the art. The nozzle cleaning device most usually applied at present is a sleeve, which is inserted into the nozzle in question. The sleeve has a configuration corresponding to the slit ori~ice of the noæzle in the combustion chamber and is mo~ed, either manually by a screw means or automatically, out through the orifice and back again, in order to keep the orifice clean of deposits.
The sleeve has tubular shape and in principle constitutes a portion of the combustion air supply duct. In practice, usually , ~. ` , ~.
11;~9329 four sleeves are assembled to the side of each other to a set and move simultaneously. This implies that the sleeves them-selves have a tendency of getting clogged by deposits and tnereby to obstruct the air supply. Due to different resistances in the different no~zles, moreover, the set of four sleeves easily is subject to being lopsided, which often g;ves rise to the so-called "chest drawer effect". Regular manual cleaning by poking, there-fore, is required.
The present invention has the object of providing a fully autom-atic method of cleaning the air nozzles at waste liquor combust-ion furnaces, which method eliminates the need of repeated manual poking as this implies for the poking person a noisy, dirty and hot work environment. The risk of said chest drawer effect is insignificant even with nozzles assembled to a set.
This object is achieved in that the invention has been given the characterizing features defined in the attached claims.
The invention is described in greater detail in the following by way of embodiments and with reference to the accompanying drawing, in which Figs. 1-5 schematically show a working procedure for the device according to the invention, and Fig. 6 is a section through an embodiment of a control mechan-ism.
In the Figures, the nozzle constituting the air inlet orifice 1 is designated by 2. The orifice 1 has the form of a gap opening into the combustion chamber wall 1, which in conventional manner is formed by water-cooled tubes, which are only schematically indicated as a line at 3. The gap extends vertically in the wall.
.
' ~ .
33Z5~
The nozzle 2 has a width along its substantial length which corresponds to the width of the gap 1. At its end remote from the gap the nozzle is provided with an air inlet 5, which up-wardly according to the embodiment shown is defined by a trans-verse wall 6 of the nozzle.
At the combustion of tne fuel, which consists of waste liquor, the combustion chamber walls are heavily covered by deposits, which in known manner gradually clog the gap, unless it is kept clean in some way.
For this purpose, a lance 4 is mounted movably in the nozzle 2 The lance substantially has the same width as the nozzle and, thus, as the gap 1. The lance preferably is reinforced by a flange 7 and provided with an extension 8, which extends in the direction opposite to the lance.
The lance 4 is mounted movably at a swing arm 9, which in its turn is pivotal in a fixed point 10. The extension 8 further is provided with a cam $ollower means 11 capable to follow a cam member 12 stationary in the space.
The lance 4 is caused to move when the cam follower means 11 is forced to move along the cam member 12.
This can be effected in such a manner, that the cam follower means 11 as shown schematically in Fig. 6 in the form of a stud extends through the stationary cam member 12, which consists of two fixed portions 12a and 12b, which between themselves form a cam groove 12c. The stud end extending through the groove 12c is received in a diametrical slit 13a of a rotary carrier 13.
When, thus, the carrier 13 is driven to rotate, for example be-cause a pinion en~,ages with the cogs 13b, the stud moves in the 11~93~
"
cam groove 12c due to the fact, that the stud at the same time is free to slide in the slit l~a of the carrier when the radial distance of the cam groove from the carrier centre varies.
By causing the carrier 13 to rotate,it is possible, thus, to cause the lance 4 to move after a certain pattern, which is described in the following.
In Fig. 1 the lance 4 is shown in its starting position. As appears from the Figure, the lance abuts with its inner end 14 the transverse wall 6 of the nozzle 2. The lance being substanti-ally of the same width as the nozzle, the lance at this position forms an air damper for the air flowing through the inlet 5.
When the carrier 13 is being rotated clockwise (according to the Figures), the lance 4 will move downward into abutment to the lower short side of the nozzle (seen by way of section) slightly inside of the gap orifice 1 (Fig. 2). The lance follows there-after with its point along the short side of the nozzle and there-after nDves out through the gap orifice 1 to the position shown in Fig. 3.
Owing to the continued rotation of the carrier 13 and to the form of the cam member 12, the lance 4 moves upward in the gap 2 with the point still oùtside the gap until the lance arrives at the upper edge of the gap 2 (Fig. 4).
The lance abutting the edge of the gap will here be drawn inward through the gap and into the nozzle 2. The lance follows with its point the upper short side of the nozzle 2 through some distance and is thereafter moved to the starting position shown in Fig. 1.
The air inlet oTening now has been cleaned efficiently from deposits. Besides, -the lo~.er short side of the nozzle 2 has l>~nscraped clean by the ~oint of the lance 4, and the upper surface of the lance has been screaped clean by the upper edge of the gap orifice.
The subse~uent cleanin~ phase can be carried out,ei-ther directly thereafter or at a later time, by moving the lance 4 in the opposite direction. The direction of rotation of the carrier :.
thereby is reversed. In this case the lance 4 will scrape clean with its end first ~he upper short side of the no7.zle 2, at its downward movement it will clean the gap 1 and thereafter it will scrape clean its lower surface against the lower edge of the gap l.
At the startir.g position, the damper position, it is also possible to vary the position of the lance (damper) and thereby the sett-ing of supplied air amount, when the lance ~ is permitted to rotate about its abutting line to the transverse wall 6, whereb~r the distance X between the lance end and the lower side of the nozzle can be changed. This can be effected by making the cam member 12 with its portion co-operating with the cam follower means in the starting position pivotal and adjustable about a point coinciding with said abutm2nt line; The cur\~e alorl~ which the cam follower means ~l thereby will move is designated b~ 15.
As also appears from Fi~s. l-S, the air inlet 5 will be open for combustion air supply to the furnace dur:ing the enti.re movement of the lance 4.
Depending on the form of the nozzle orifice, the configurat.ion of the lance, the desired move!r.ent pat-ern for the lance etc., ~1~293Z9 ~, it is possible within ~he scope of the invention to vary the form of the curve means and to cause it to rotate as a certain function of the rotation of the carrier, or even to replace the curve means by a crank. These solutions per se lie within the scope of professional skill.
It also is possible to cause the lance 4 to move by reciprocat-ing the swing arm 9 by means, for example, of a pneumatic device.
The lancè 4, for example, also can be caused to move by design-ing the cam follower means as a driven pinion climbing along the cam member, which is provided with cogs corresponding to the pinion.
The drive of the carrier, the pneumatic device or the driven pinion preferably are controlled by a time relay set for the operation conditions intended.
By making the clearance in the mounting of the wing arm 9 sufficiently great and/or by providing a certain play between the cam follower means and the cam member, the sides of the nozzle 2 will serve as guides for the lance, which in certain cases is advantageous with respect to the cleaning and which also elimin-ates the risk that the lance gets stuck in some position. Even if the lance should get stuck, the lance a~d the nozzle are accessible to tools.
Several ways of solvin~ this problem are known in the art. The nozzle cleaning device most usually applied at present is a sleeve, which is inserted into the nozzle in question. The sleeve has a configuration corresponding to the slit ori~ice of the noæzle in the combustion chamber and is mo~ed, either manually by a screw means or automatically, out through the orifice and back again, in order to keep the orifice clean of deposits.
The sleeve has tubular shape and in principle constitutes a portion of the combustion air supply duct. In practice, usually , ~. ` , ~.
11;~9329 four sleeves are assembled to the side of each other to a set and move simultaneously. This implies that the sleeves them-selves have a tendency of getting clogged by deposits and tnereby to obstruct the air supply. Due to different resistances in the different no~zles, moreover, the set of four sleeves easily is subject to being lopsided, which often g;ves rise to the so-called "chest drawer effect". Regular manual cleaning by poking, there-fore, is required.
The present invention has the object of providing a fully autom-atic method of cleaning the air nozzles at waste liquor combust-ion furnaces, which method eliminates the need of repeated manual poking as this implies for the poking person a noisy, dirty and hot work environment. The risk of said chest drawer effect is insignificant even with nozzles assembled to a set.
This object is achieved in that the invention has been given the characterizing features defined in the attached claims.
The invention is described in greater detail in the following by way of embodiments and with reference to the accompanying drawing, in which Figs. 1-5 schematically show a working procedure for the device according to the invention, and Fig. 6 is a section through an embodiment of a control mechan-ism.
In the Figures, the nozzle constituting the air inlet orifice 1 is designated by 2. The orifice 1 has the form of a gap opening into the combustion chamber wall 1, which in conventional manner is formed by water-cooled tubes, which are only schematically indicated as a line at 3. The gap extends vertically in the wall.
.
' ~ .
33Z5~
The nozzle 2 has a width along its substantial length which corresponds to the width of the gap 1. At its end remote from the gap the nozzle is provided with an air inlet 5, which up-wardly according to the embodiment shown is defined by a trans-verse wall 6 of the nozzle.
At the combustion of tne fuel, which consists of waste liquor, the combustion chamber walls are heavily covered by deposits, which in known manner gradually clog the gap, unless it is kept clean in some way.
For this purpose, a lance 4 is mounted movably in the nozzle 2 The lance substantially has the same width as the nozzle and, thus, as the gap 1. The lance preferably is reinforced by a flange 7 and provided with an extension 8, which extends in the direction opposite to the lance.
The lance 4 is mounted movably at a swing arm 9, which in its turn is pivotal in a fixed point 10. The extension 8 further is provided with a cam $ollower means 11 capable to follow a cam member 12 stationary in the space.
The lance 4 is caused to move when the cam follower means 11 is forced to move along the cam member 12.
This can be effected in such a manner, that the cam follower means 11 as shown schematically in Fig. 6 in the form of a stud extends through the stationary cam member 12, which consists of two fixed portions 12a and 12b, which between themselves form a cam groove 12c. The stud end extending through the groove 12c is received in a diametrical slit 13a of a rotary carrier 13.
When, thus, the carrier 13 is driven to rotate, for example be-cause a pinion en~,ages with the cogs 13b, the stud moves in the 11~93~
"
cam groove 12c due to the fact, that the stud at the same time is free to slide in the slit l~a of the carrier when the radial distance of the cam groove from the carrier centre varies.
By causing the carrier 13 to rotate,it is possible, thus, to cause the lance 4 to move after a certain pattern, which is described in the following.
In Fig. 1 the lance 4 is shown in its starting position. As appears from the Figure, the lance abuts with its inner end 14 the transverse wall 6 of the nozzle 2. The lance being substanti-ally of the same width as the nozzle, the lance at this position forms an air damper for the air flowing through the inlet 5.
When the carrier 13 is being rotated clockwise (according to the Figures), the lance 4 will move downward into abutment to the lower short side of the nozzle (seen by way of section) slightly inside of the gap orifice 1 (Fig. 2). The lance follows there-after with its point along the short side of the nozzle and there-after nDves out through the gap orifice 1 to the position shown in Fig. 3.
Owing to the continued rotation of the carrier 13 and to the form of the cam member 12, the lance 4 moves upward in the gap 2 with the point still oùtside the gap until the lance arrives at the upper edge of the gap 2 (Fig. 4).
The lance abutting the edge of the gap will here be drawn inward through the gap and into the nozzle 2. The lance follows with its point the upper short side of the nozzle 2 through some distance and is thereafter moved to the starting position shown in Fig. 1.
The air inlet oTening now has been cleaned efficiently from deposits. Besides, -the lo~.er short side of the nozzle 2 has l>~nscraped clean by the ~oint of the lance 4, and the upper surface of the lance has been screaped clean by the upper edge of the gap orifice.
The subse~uent cleanin~ phase can be carried out,ei-ther directly thereafter or at a later time, by moving the lance 4 in the opposite direction. The direction of rotation of the carrier :.
thereby is reversed. In this case the lance 4 will scrape clean with its end first ~he upper short side of the no7.zle 2, at its downward movement it will clean the gap 1 and thereafter it will scrape clean its lower surface against the lower edge of the gap l.
At the startir.g position, the damper position, it is also possible to vary the position of the lance (damper) and thereby the sett-ing of supplied air amount, when the lance ~ is permitted to rotate about its abutting line to the transverse wall 6, whereb~r the distance X between the lance end and the lower side of the nozzle can be changed. This can be effected by making the cam member 12 with its portion co-operating with the cam follower means in the starting position pivotal and adjustable about a point coinciding with said abutm2nt line; The cur\~e alorl~ which the cam follower means ~l thereby will move is designated b~ 15.
As also appears from Fi~s. l-S, the air inlet 5 will be open for combustion air supply to the furnace dur:ing the enti.re movement of the lance 4.
Depending on the form of the nozzle orifice, the configurat.ion of the lance, the desired move!r.ent pat-ern for the lance etc., ~1~293Z9 ~, it is possible within ~he scope of the invention to vary the form of the curve means and to cause it to rotate as a certain function of the rotation of the carrier, or even to replace the curve means by a crank. These solutions per se lie within the scope of professional skill.
It also is possible to cause the lance 4 to move by reciprocat-ing the swing arm 9 by means, for example, of a pneumatic device.
The lancè 4, for example, also can be caused to move by design-ing the cam follower means as a driven pinion climbing along the cam member, which is provided with cogs corresponding to the pinion.
The drive of the carrier, the pneumatic device or the driven pinion preferably are controlled by a time relay set for the operation conditions intended.
By making the clearance in the mounting of the wing arm 9 sufficiently great and/or by providing a certain play between the cam follower means and the cam member, the sides of the nozzle 2 will serve as guides for the lance, which in certain cases is advantageous with respect to the cleaning and which also elimin-ates the risk that the lance gets stuck in some position. Even if the lance should get stuck, the lance a~d the nozzle are accessible to tools.
Claims (11)
1. A method of automatically cleaning an air nozzle in a waste liquor combustion furnace, which air nozzle opens as a long and narrow gap provided in the combustion chamber wall of the furnace, characterized in that a rod-shaped lance having a width corresponding substantially to the width of the gap is moved from a starting position in which its front end remains within the nozzle and remote from the combustion chamber, towards one end of the gap and out there through, and then along the elongate sides of the gap while its front end projects outside thereof until it reaches the other end of the gap and thereafter is retracted and returned to the starting position.
2. A method according to claim 1, characterized in that the lance is moved from the other end of the gap inward through the gap and to the starting position.
3. A method according to claim 2, characterized in that the lance is moved in the opposite direction.
4. A method according to claim 3 characterized in that the lance is moved towards and away from the gap, its forward portion contacting the ends of the gap.
5. A method according to claim 4, characterized in that one side of the lance slides against one end of the gap, and the lance side opposed to said one side slides against the other end of the gap.
6. A method according to claim 1, characterized in that during the movement of the lance back to the starting position a portion of the lance is caused sealingly to contact a rear portion of the nozzle, in which sealing position the lance is adjustably movable relative to the nozzle, thereby forming a damper lying in the nozzle.
7. A device for automatically cleaning an air nozzle in the wall of a waste liquor burning furnace, said nozzle having the form of a long and narrow gap in said wall extending from an air inlet at its end remote from the furnace to an orifice facing the furnace, the device comprising:
a lance having a forward end and a rearward end and a body extending between said ends, and having a width sub-stantially equal to that of said nozzle;
a swing arm pivotably mounted in said nozzle and hingedly connected to said lance body between the ends of said lance, for carrying said lance; and a rotatable crank mechanism engaging said lance at its rearward end for causing a reciprocatory and swinging movement of said lance so that its forward end scrapes deposits from said nozzle adjacent said orifice.
a lance having a forward end and a rearward end and a body extending between said ends, and having a width sub-stantially equal to that of said nozzle;
a swing arm pivotably mounted in said nozzle and hingedly connected to said lance body between the ends of said lance, for carrying said lance; and a rotatable crank mechanism engaging said lance at its rearward end for causing a reciprocatory and swinging movement of said lance so that its forward end scrapes deposits from said nozzle adjacent said orifice.
8. The device according to claim 7, in which said crank mechanism comprises a stationary cam member having a cam groove running in a loop around a center, a carrier mounted for rotation about the center of said cam member and having a radially extending slot, and a stud means at the rear end of said lance engaged in said cam groove and said radially extending slot.
9. The device according to claim 7, in which the stroke of said crank mechanism and the length of said swing arm are selected so as to permit the forward end of said lance, during a reciprocatory movement thereof, to protrude through said orifice and perform part of its swinging movement while still outside said orifice.
10. The device according to claim 7, in which the upper margin of said air inlet is defined by a transverse wall, and the crank mechanism and the swing arm are so arranged, that the rear end of said lance, in a rest position, abuts said transverse wall and holds said lance body in a position in said nozzle slanting downwards from said wall, with said forward end defining one edge of the air gap and determining the amount of air supplied.
11. A device for automatically cleaning an air nozzle in the wall of a waste liquor burning furnace, said nozzle having the form of a long and narrow gap in said wall extending from an air inlet at its end remote from the furnace to an orifice facing the furnace, the device comprising:
a lance having a forward end and a rearward end and a body extending between said ends, and having a width substantially equal to that of said nozzle;
a swing arm pivotably mounted in said nozzle and hingedly connected to said lance body between the ends of said lance for carrying said lance; and driving means operatively connected to the rearward end of said lance, comprising a stationary cam having a cogged cam track surface, a cogged pinion intermeshing with the track of said cam, and means for rotating said pinion to cause said pinion to travel along said cam track to cause said lance to reciprocate and swing so that its forward end scraps deposits from said nozzle adjacent said orifice.
a lance having a forward end and a rearward end and a body extending between said ends, and having a width substantially equal to that of said nozzle;
a swing arm pivotably mounted in said nozzle and hingedly connected to said lance body between the ends of said lance for carrying said lance; and driving means operatively connected to the rearward end of said lance, comprising a stationary cam having a cogged cam track surface, a cogged pinion intermeshing with the track of said cam, and means for rotating said pinion to cause said pinion to travel along said cam track to cause said lance to reciprocate and swing so that its forward end scraps deposits from said nozzle adjacent said orifice.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7710574-0 | 1977-09-21 | ||
| SE7710574A SE7710574L (en) | 1977-09-21 | 1977-09-21 | METHOD AND DEVICE FOR AUTOMATICLY CLEANING THE AIR NOZZLES IN A WASTE COMBINATION OVEN |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1129329A true CA1129329A (en) | 1982-08-10 |
Family
ID=20332331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA310,845A Expired CA1129329A (en) | 1977-09-21 | 1978-09-07 | Method and device for automatically cleaning the air nozzles in a waste liquor combustion furnace |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS5459633A (en) |
| BR (1) | BR7806193A (en) |
| CA (1) | CA1129329A (en) |
| ES (1) | ES473559A1 (en) |
| FI (1) | FI782790A (en) |
| FR (1) | FR2404174A1 (en) |
| NO (1) | NO783113L (en) |
| SE (1) | SE7710574L (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4423533A (en) * | 1982-06-09 | 1984-01-03 | Goodspeed Byron Lester | Furnace air port cleaner |
| FI109211B (en) * | 1997-06-25 | 2002-06-14 | Osmo Kaulamo Engineering Oy | Air cabinet for chemical regeneration furnace |
-
1977
- 1977-09-21 SE SE7710574A patent/SE7710574L/en not_active Application Discontinuation
-
1978
- 1978-09-07 CA CA310,845A patent/CA1129329A/en not_active Expired
- 1978-09-12 FI FI782790A patent/FI782790A/en unknown
- 1978-09-14 NO NO783113A patent/NO783113L/en unknown
- 1978-09-19 FR FR7826761A patent/FR2404174A1/en active Granted
- 1978-09-20 BR BR7806193A patent/BR7806193A/en unknown
- 1978-09-20 JP JP11570678A patent/JPS5459633A/en active Pending
- 1978-09-21 ES ES473559A patent/ES473559A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FI782790A (en) | 1979-03-22 |
| SE7710574L (en) | 1979-03-22 |
| NO783113L (en) | 1979-03-22 |
| FR2404174A1 (en) | 1979-04-20 |
| JPS5459633A (en) | 1979-05-14 |
| ES473559A1 (en) | 1979-04-01 |
| BR7806193A (en) | 1979-04-17 |
| FR2404174B3 (en) | 1981-06-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |