SE2050959A1 - Apparatus and method for clearing a borehole opening - Google Patents
Apparatus and method for clearing a borehole openingInfo
- Publication number
- SE2050959A1 SE2050959A1 SE2050959A SE2050959A SE2050959A1 SE 2050959 A1 SE2050959 A1 SE 2050959A1 SE 2050959 A SE2050959 A SE 2050959A SE 2050959 A SE2050959 A SE 2050959A SE 2050959 A1 SE2050959 A1 SE 2050959A1
- Authority
- SE
- Sweden
- Prior art keywords
- boom
- sweeper assembly
- borehole
- brush
- blockages
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 20
- 241001417527 Pempheridae Species 0.000 claims abstract description 52
- 238000005065 mining Methods 0.000 claims abstract description 18
- 238000010276 construction Methods 0.000 claims abstract description 15
- 238000007790 scraping Methods 0.000 claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 description 11
- 238000005553 drilling Methods 0.000 description 7
- 239000002360 explosive Substances 0.000 description 6
- 239000004927 clay Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000011010 flushing procedure Methods 0.000 description 3
- 238000005422 blasting Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B12/00—Accessories for drilling tools
- E21B12/06—Mechanical cleaning devices
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/02—Scrapers specially adapted therefor
-
- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B13/00—Brushes with driven brush bodies or carriers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools
- B08B1/10—Cleaning by methods involving the use of tools characterised by the type of cleaning tool
- B08B1/12—Brushes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools
- B08B1/10—Cleaning by methods involving the use of tools characterised by the type of cleaning tool
- B08B1/16—Rigid blades, e.g. scrapers; Flexible blades, e.g. wipers
- B08B1/165—Scrapers
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
A boom (4) of a mining or construction work machine (1), which boom (4) comprising a first end (4a) connectable to the mining or construction work machine (1), a distal second end (4b), and at least one sweeper assembly (6) arranged at the distal second end (4b) of the boom (4), wherein the sweeper assembly (6) is configured to clear a borehole opening of blockages at entrance to the borehole.
Description
APPARATUS AND METHOD FOR CLEARING A BOREHOLE OPENING TECHNICAL FIELD The present disclosure relates to a sweeper assembly arranged at a distal end of aboom of a mining or construction work machine. The sweeper assembly may be usedfor preparing boreholes for a blasting operation. The present disclosure further relatesto a method of using the sweeper assembly for removing blockages from a borehole opening.
BACKGROUND Mining operations and construction work commonly utilize drilling and blastingtechniques. Usually, a plurality of boreholes need to be drilled into a rock surface. Theboreholes extend a proper depth into the rock and are filled with explosive charges when drilling of all the holes is complete. ln the course of drilling prior to the filling with explosives, drill cuttings need to beremoved from the drilled holes with the aid of a flushing medium such as compressedair or liquid. The liquid flush medium such as water may mix with the drill cuttings toform a clay paste. When a number of holes are drilled close together in a downwardlydirected manner, the drill cuttings from a hole currently being drilled can block entranceto the already drilled holes nearby. The particularly affected are the lifter holes whichare drilled along the floor of a tunnel for lifting the rock to floor level. The lifter holesmay become buried and covered up completely by the drill cuttings and/or the clay paste thereof. ln the state of the art, an operator has to leave the relatively safe control station tomanually locate and clean the entrance to every borehole while being exposed to thehazardous mining or construction environment. lt is a long laborious process to find theburied borehole openings and subsequently clear them of the drill cuttings and/or theclay paste thereof, Which impedes the progress of improving work efficiency and productivity.
The problem with drill cuttings may be avoided by the method disclosed in WO2012067579 A1 or US 20020167215 A1. However, the process of installing pipes according to WO 2012067579 A1 or drilling line holes according to US 20020167215 A1 would incur other problems while leaving the problem with drill cuttings unsolved.
There is a high demand for improved apparatus and method for clearing boreholeopenings Which can solve the problem with drill cuttings in a straight-forward and efficient manner.
SUMMARY ln view of the above, one object of the present disclosure is therefore to reduce manualworkload and risks for personnel at the site during operations for clearing a borehole opening of blockages at entrance to the borehole.Another object of the disclosure is to increase work efficiency and productivity.
Yet another object of the disclosure is to provide a novel and advantageous solution for clearing a borehole opening of blockages at entrance to the borehole.
Yet another object of the disclosure is to provide a robust and reliable solution for clearing a borehole opening of blockages at entrance to the borehole.
Yet another object of the disclosure is to provide an alternative solution for clearing a borehole opening of blockages at entrance to the borehole.
Yet another object of the disclosure is to improve mechanization and automation of clearing a borehole opening of blockages at entrance to the borehole.
The above mentioned objects are achieved according to a first aspect of the disclosureby a boom of a mining or construction work machine, which boom comprising a firstend connectable to the mining or construction work machine, a distal second end, andat least one sweeper assembly arranged at the distal second end of the boom. Thesweeper assembly is configured to clear a borehole opening of blockages at entranceto the borehole. The boom as was described above enables mechanization andautomation of the process of clearing a borehole opening of blockages at entrance to the borehole.
The sweeper assembly as was described above comprises at least one rotary actuatorand/or at least one linear actuator. The at least one rotary actuator is used to transformenergy to mechanical rotation of the sweeper assembly. The at least one linear actuator is used to move the sweeper assembly in a straight line.
The sweeper assembly as was described above further comprises at least one brushconfigured to rotate about an axis A. The rotating brush has the advantage ofproducing a continuous cleaning of a large area thereby increasing work efficiency and productivity.
The brush as was described above may comprise a rotatable shaft or drum. The rotaryactuator as was described above controls mechanical rotation of the at least one brush via the shaft or drum.
The brush as was described above may further comprises a plurality of single- and/ormulti-strand steel wire packs. The steel wire packs are wear-resistant such that the sweeper assembly can perform in an aggressive manner.
The sweeper assembly as was described above may comprises at least one scrapingtool. The scraping tool has the advantage of providing a more focused cleaning whichis particularly efficient for removing tough clay paste of drill cuttings from a borehole opening.
The sweeper assembly with at least one scraping tool may comprise at least onehydraulic cylinder configured to control operation of the at least one scraping tool. The hydraulic cylinder inherently produces linear motion of the at least one scraping tool.
The above mentioned objects are also achieved according to a second aspect of thedisclosure by a rig comprising at least one boom as was described above. The rig hasall the advantages that have been described above in conjunction with the boom and the sweeper assembly.
The above mentioned objects are also achieved according to a third aspect of thedisclosure by a method of clearing a borehole opening of blockages at entrance to theborehole, which method comprising the steps of positioning the sweeper assembly aswas described at entrance to the borehole; and controlling operation of the at least onebrush and/or the at least one scraping tool of the sweeper assembly as was describedabove to remove blockages from the borehole opening. The method has all theadvantages that have been described above in conjunction with the boom and the sweeper assembly. 4BRIEF DESCRIPTION OF THE DRAWINGS With reference to the appended drawings, below follows a more detailed description of embodiments of the disclosure cited as examples. ln the drawings: Figure 1 is a schematic representation of a mining or construction work machine;Figure 2 depicts a sweeper assembly with a brush in a perspective view; Figure 3 is a schematic representation of a brush with a rotatable drum; Figure 4 is a schematic representation of a sweeper assembly with a scraping tool.
DETAILED DESCRIPTION The present disclosure aims to reduce or even eliminate exposure of personnel to thehazardous work environment during operations for clearing a borehole opening ofblockages at entrance to the borehole. The present disclosure further aims to reducemanual workload and increase work efficiency or productivity. The present disclosureimproves mechanization and automation of the operations for clearing a boreholeopening of blockages at entrance to the borehole by providing a novel, robust and reliable solution which is advantageous over the state of the art.
According to a first aspect of the disclosure, there is provided a boom 4 of a mining orconstruction work machine 1, which boom 4 comprising a first end 4a connectable tothe mining or construction work machine 1, a distal second end 4b, and a sweeperassembly 6 arranged at the distal second end 4b of the boom 4. The sweeperassembly 6 is configured to clear a borehole opening of blockages at entrance to theborehole. The boom 4 comprising the sweeper assembly 6 enables mechanization andautomation of the process of clearing a borehole opening of blockages at entrance to the borehole. Furthermore, the sweeper assembly 6 is easy to operate.
The mining or construction work machine 1 may be a charging rig for loading boreholeswith explosive charges. The charging rig 1 may comprise a mounting device 3 attachedto the distal second end 4b of the at least one boom 4 (Fig. 1), which mounting device3 comprises a beam 5, wherein the sweeper assembly 6 is arranged on the beam 5(Fig. 2). Other devices or tools, e.g. a loading assembly as was described in our patent application SE 2030174-3, a hose for flushing medium, an explosive delivery hose, a hose handling unit, etc. may also be arranged on the same beam 5 of the charging rig 1 as the sweeper assembly 6.
The sweeper assembly 6 may comprise at least one rotary actuator and/or at least one linear actuator.
The at least one rotary actuator is used to transform energy to mechanical rotation ofthe sweeper assembly 6. The at least one rotary actuator may be hydraulically, pneumatically or electrically powered.
The at least one linear actuator is used to move the sweeper assembly 6 in a straightline. The at least one linear actuator may be hydraulically, pneumatically or electricallypowered. The at least one linear actuator may be a hydraulic or pneumatic cylinder that inherently produces linear motion.
The sweeper assembly 6 may further comprise at least one brush 7 configured torotate about an axis A (Figs. 2 and 3). The rotating brush 7 has the advantage ofproducing a continuous cleaning of a large area thereby increasing work efficiency and productivity.
The sweeper assembly 6 may further comprise a connection means 20, whichconnection means 20 connects the brush 7 to the distal second end 4b of the boom 4.The connection means 20 may comprise an extendable first part with at least tvvotelescopic sections, wherein the first part is connectable to the distal second end 4b ofthe boom 4; and a second part connectable to the brush 7. A mining or constructionwork machine 1 may typically comprise a mounting device 3 attached to the distalsecond end 4b of the at least one boom 4 (Fig. 1), which mounting device 3 comprisesa beam 5, wherein the connection means 20 of the sweeper assembly 6 connects thebrush 7 to the beam 5 at the distal second end 4b of the boom 4 (Fig. 2).
The connection means 20 comprising an extendable first part with at least twotelescopic sections provides the advantage of space-saving storage of the brush 7when the sweeper assembly 6 is not in use and the advantage of flexibility in gettingaccess to the area to be swept. Operation of the extendable first part of the connection means 20 may be controlled by a linear actuator.
The brush 7 as illustrated in Fig. 2 may comprise a rotatable shaft. The rotary actuatoras was described above controls mechanical rotation of the at least one brush 7 via theshaft.
The brush 7 as illustrated in Fig. 2 may comprise a single-piece mounting flange 21,wherein a plurality of single- and/or multi-strand wire packs 8 are mechanically affixedto the single-piece mounting flange 21. Preferably, the wire packs 8 are made of wear-resistant material such as steel wires, which enables more aggressive performance of the sweeper assembly 6.
The brush 7 as illustrated in Fig. 3 may comprise a rotatable drum 9 (Fig. 3a). Fig. 3b isa cross-sectional view of the brush 7 with a rotatable drum 9. A cutting plane 30indicated in Fig. 3a defines the cross-section shown in Fig. 3b. The rotary actuator aswas described above controls mechanical rotation of the at least one brush 7 via the drum 9.
The brush 7 as illustrated in Fig. 3 may comprise a plurality of single- and/or multi-strand wire packs 8 mechanically affixed to the drum 9. Preferably, the wire packs 8are made of wear-resistant material such as stainless steel, which enables aggressive performance of the sweeper assembly 6.
The sweeper assembly 6 may comprise at least one scraping tool 10. The scraping tool10 has the advantage of providing a more focused cleaning which is particularly efficient for removing tough clay paste of drill cuttings from a borehole opening.
The sweeper assembly 6 may comprise at least one hydraulic cylinder 11 configured tocontrol operation of the at least one scraping tool 10. The hydraulic cylinder 11 inherently produces linear motion of the at least one scraping tool 10.
The sweeper assembly 6 may comprise a connection means 20, which connectionmeans 20 comprising a shank 40 connected to the at least one scraping tool 10, a pivotmember 42 connecting the shank 40 to the distal second end 4b of the boom 4, and afeeding device 41 arranged at the distal second end 4b of the boom 4, wherein thefeeding device 41 is connected to the shank 40. The pivot member 42 enables rotary motion of the shank 40 around the pivot member 42 (Fig. 4).
Typically, a mining or construction work machine 1 comprises a mounting device 3attached to the distal second end 4b of the at least one boom 4 (Fig. 1). The mountingdevice 3 comprises a beam 5, wherein the shank 40 is connected to the beam 5 via thepivot member 42 at the distal second end 4b of the boom 4, and wherein the feedingdevice 41 is attached to the beam 5 at the distal second end 4b of the boom 4 (Fig. 4).The feeding device 41 is configured to move along the longitudinal axis of the beam 5.Preferably, the feeding device 41 comprises an even number of rollers, which has the advantage of ensuring stable movement of the feeding device 41.
The sweeper assembly 6 as illustrated in Fig. 4 may further comprise a first hydrauliccylinder 11 configured to control operation of the scraping tool 10, a second hydrauliccylinder 11 configured to control operation of the shank 40, and a third hydraulic cylinder 11 configured to control operation of the feeding device 41.
The sweeper assembly 6 as was described above provides the advantage of space-saving storage of the scraping tool 10 when the sweeper assembly 6 is not in use and the advantage of flexibility in get access to the area to be cleaned.
According to a second aspect of the disclosure, there is provided a rig 1 comprising atleast one boom 4 as was described above. The rig 1 may be a complex equipmentintended for earth surface use or underground use. The rig 1 may be a mining orconstruction Work machine adapted for various mining operations or construction work.The rig 1 may be a drilling rig adapted for drilling blasting holes, injection holes, holesfor rock bolt reinforcement, etc.. The rig 1 may be a charging rig for loading boreholes with explosive charges.
Fig. 1 shows schematically a mining or construction work machine 1 comprising acarrier 2, at least one boom 4 and a mounting device 3 attached to the distal secondend 4b of the at least one boom 4. Typically, the mounting device 3 comprises a beam5 on which the sweeper assembly 6 may be arranged (Figs. 2 and 4). Other devices ortools, e.g. a drilling machine, a loading assembly as was described in our patentapplication SE 2030174-3, a hose for flushing medium, an explosive delivery hose, ahose handling unit, etc. may also be arranged on the same beam 5 as the sweeperassembly 6. An enlarged view of the beam 5 with the sweeper assembly 6 is providedin Figs. 2 and 4. The rig 1 has all the advantages that have been described above in conjunction with the boom 4 and the sweeper assembly 6.
According to a third aspect of the disclosure, there is provided a method of clearing aborehole opening of blockages at entrance to the borehole, which method comprisingthe steps of positioning the sweeper assembly 6 as was described above at entranceto the borehole; and controlling operation of the at least one brush 7 and/or the at leastone scraping tool 10 of the sweeper assembly 6 to remove blockages from theborehole opening. Optionally, the method further comprises a step of rinsing the sweptborehole opening with water, which removes any residual debris from the entrance tothe borehole. The method has all the advantages that have been described above in conjunction with the boom 4 and the sweeper assembly 6.
The method as was described above for clearing a borehole opening of blockages atentrance to the borehole is a straightfonNard method which may be at least partially automatized.
Although the invention has been described in terms of example embodiments as setforth above, it should be understood that the examples are given solely for the purposeof illustration and are not to be construed as limitations of the claims, as manyvariations thereof are possible Without departing from the scope of the invention. Eachfeature disclosed or illustrated in the present disclosure may be incorporated in theclaims, whether alone or in any appropriate combination with any other feature disclosed or illustrated herein.
Claims (10)
1. A boom (4) of a mining or construction work machine (1), which boom (4)comprising a first end (4a) connectable to the mining or construction work machine (1), a distal second end (4b), and at least one sweeper assembly (6) arranged at the distal second end (4b) of the boom(4), wherein the sweeper assembly (6) is configured to clear a borehole opening of blockages at entrance to the borehole.
2. The boom (4) according to claim 1, wherein the sweeper assembly (6) comprises at least one rotary actuator and/or at least one linear actuator.
3. The boom (4) according to claim 1 or 2, wherein the sweeper assembly (6) further comprises at least one brush (7) configured to rotate about an axis A.
4. The boom (4) according to claim 3, wherein the brush (7) comprises a rotatable shaft.
5. The boom (4) according to claim 3, wherein the brush (7) comprises a rotatable drum (9).
6. The boom (4) according to any one of the claims 3 to 5, wherein the brush (7) further comprises a plurality of single- and/or multi-strand steel Wire packs (8).
7. The boom (4) according to claim 1 or 2, wherein the sweeper assembly (6) comprises at least one scraping tool (10).
8. The boom (4) according to claim 7, wherein the sweeper assembly (6)comprises at least one hydraulic cylinder (11) configured to control operation of the at least one scraping tool (10).
9. A rig (1) comprising at least one boom (4) according to any one of the previous claims.
10. A method of clearing a borehole opening of blockages at entrance to theborehole, which method comprising the steps of positioning the sweeper assembly (6) according to any one of the c|aims 1 to 8 atentrance to the borehole; and control/ing operation of the at least one brush (7) and/or the at least one scraping tool (10) of the sweeper assembly (6) to remove blockages from the borehole opening.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE2050959A SE544331C2 (en) | 2020-08-18 | 2020-08-18 | Apparatus and method for clearing a borehole opening |
| PCT/SE2021/050801 WO2022039653A1 (en) | 2020-08-18 | 2021-08-17 | Apparatus and method for clearing a borehole opening |
| AU2021327697A AU2021327697A1 (en) | 2020-08-18 | 2021-08-17 | Apparatus and method for clearing a borehole opening |
| EP21759429.0A EP4200508A1 (en) | 2020-08-18 | 2021-08-17 | Apparatus and method for clearing a borehole opening |
| CA3188347A CA3188347A1 (en) | 2020-08-18 | 2021-08-17 | Apparatus and method for clearing a borehole opening |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE2050959A SE544331C2 (en) | 2020-08-18 | 2020-08-18 | Apparatus and method for clearing a borehole opening |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| SE2050959A1 true SE2050959A1 (en) | 2022-02-19 |
| SE544331C2 SE544331C2 (en) | 2022-04-12 |
Family
ID=77499891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE2050959A SE544331C2 (en) | 2020-08-18 | 2020-08-18 | Apparatus and method for clearing a borehole opening |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP4200508A1 (en) |
| AU (1) | AU2021327697A1 (en) |
| CA (1) | CA3188347A1 (en) |
| SE (1) | SE544331C2 (en) |
| WO (1) | WO2022039653A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5628081A (en) * | 1992-10-02 | 1997-05-13 | Putzmeister-Werk Maschinenfabrik Gmbh | Brush head for large manipulators |
| KR100893316B1 (en) * | 2008-12-11 | 2009-04-15 | 주식회사 고속도로관리공단 | Illumination lamp washer of tunnel |
| CN109372534A (en) * | 2018-11-15 | 2019-02-22 | 江西蓝翔重工有限公司 | The drill loader group of tape cable reel on a kind of transport groove body |
| CN210396627U (en) * | 2019-09-02 | 2020-04-24 | 无锡中维建筑机械制造有限公司 | Hydraulic spiral drill for skid steer loader |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1612186A (en) * | 1926-12-28 | Posthole digger | ||
| US6527345B2 (en) | 2001-05-10 | 2003-03-04 | Inco Limited | Method for excavating a tunnel rock face by drilling a pattern of lifter and line holes |
| SE536651C2 (en) | 2010-11-17 | 2014-04-29 | Atlas Copco Rock Drills Ab | Procedure, systems and rock drilling systems for installation of pipes at rock drilling |
-
2020
- 2020-08-18 SE SE2050959A patent/SE544331C2/en unknown
-
2021
- 2021-08-17 AU AU2021327697A patent/AU2021327697A1/en active Pending
- 2021-08-17 WO PCT/SE2021/050801 patent/WO2022039653A1/en unknown
- 2021-08-17 EP EP21759429.0A patent/EP4200508A1/en active Pending
- 2021-08-17 CA CA3188347A patent/CA3188347A1/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5628081A (en) * | 1992-10-02 | 1997-05-13 | Putzmeister-Werk Maschinenfabrik Gmbh | Brush head for large manipulators |
| KR100893316B1 (en) * | 2008-12-11 | 2009-04-15 | 주식회사 고속도로관리공단 | Illumination lamp washer of tunnel |
| CN109372534A (en) * | 2018-11-15 | 2019-02-22 | 江西蓝翔重工有限公司 | The drill loader group of tape cable reel on a kind of transport groove body |
| CN210396627U (en) * | 2019-09-02 | 2020-04-24 | 无锡中维建筑机械制造有限公司 | Hydraulic spiral drill for skid steer loader |
Also Published As
| Publication number | Publication date |
|---|---|
| EP4200508A1 (en) | 2023-06-28 |
| AU2021327697A1 (en) | 2023-02-09 |
| WO2022039653A1 (en) | 2022-02-24 |
| SE544331C2 (en) | 2022-04-12 |
| CA3188347A1 (en) | 2022-02-24 |
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