EP3354821A1 - Système de fixation de mât et procédé de fixation d'un mât en bois - Google Patents
Système de fixation de mât et procédé de fixation d'un mât en bois Download PDFInfo
- Publication number
- EP3354821A1 EP3354821A1 EP18150291.5A EP18150291A EP3354821A1 EP 3354821 A1 EP3354821 A1 EP 3354821A1 EP 18150291 A EP18150291 A EP 18150291A EP 3354821 A1 EP3354821 A1 EP 3354821A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mast
- bandage
- wooden
- tensioning cable
- eyelet
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 10
- 230000003014 reinforcing effect Effects 0.000 claims description 15
- 238000004873 anchoring Methods 0.000 claims description 3
- 230000008719 thickening Effects 0.000 claims description 3
- 239000004020 conductor Substances 0.000 description 4
- 239000004744 fabric Substances 0.000 description 4
- 239000002023 wood Substances 0.000 description 4
- 230000009194 climbing Effects 0.000 description 3
- 241000238565 lobster Species 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 101100398412 Arabidopsis thaliana ASK1 gene Proteins 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 238000009958 sewing Methods 0.000 description 2
- 238000010073 coating (rubber) Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/20—Side-supporting means therefor, e.g. using guy ropes or struts
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/02—Structures made of specified materials
- E04H12/04—Structures made of specified materials of wood
Definitions
- the present invention relates to a mast securing system and a method for securing a wooden mast.
- Power grids have overhead power lines carried by wooden poles.
- an installer climbs along the wooden pole using climbing equipment to access the support point of the conductor or conductors.
- the wooden mast must be secured against overturning before the ascent of the fitter in order to ensure a safe ascent of the fitter.
- the wooden mast is therefore secured in advance with a mast securing system.
- the mast securing system constructed in this manner consists of a large number of metallic individual parts which occupy a large storage space in a transport vehicle and are unwieldy to handle. So well-known mast securing systems can not be worn or only with great effort by a single person from a transport vehicle to be secured to a wooden mast. If the simultaneous maintenance of a plurality of wooden poles is provided, a corresponding metal linkage with gimbal clamping device must be carried along for each wooden pole to be secured.
- the invention is based on the technical problem of providing an improved mast securing system and a method for securing a wooden mast which do not or at least to a lesser extent have the disadvantages described above, the mast securing system being particularly compact during use and in transport low weight and easy to use.
- the invention relates to a mast securing system, with at least one bandage having a flexible belt, which is adapted to enclose a wooden pole circumferentially at least in sections, with a first tensioning cable, which is adapted to the bandage against a lateral surface of the wooden mast to be braced and anchored in an environment of the wooden mast, with a second tensioning cable adapted to be secured to the bandage and anchored in the vicinity of the wooden mast, the bandage having a first ear to which the first tensioning cable attaches and wherein the bandage has a second eyelet to which the second tensioning cable is attached.
- the wooden pole can be a wooden pole carrying a power line or one or more conductor cables.
- the wooden mast can be a telecommunication mast.
- the wooden pole to be secured may have a diameter of 10 cm or more.
- the wooden pole has a diameter of up to 50 cm, in particular of up to 35 cm.
- the bandage with the flexible belt can be clamped by means of the first tensioning cable against the lateral surface of the wooden mast.
- the attachment of the bandage to the wooden mast is therefore without a complex universal joint and corresponding linkage, but can be done only by a tensioning cable.
- the present mast securing system therefore builds much lighter and more compact.
- the flexible belt conforms to a lateral surface of the respectively to be secured wooden mast and so can compensate for irregularities in the cross-sectional shape or the outer contour of the wooden mast, so that a reliable, areal conditioning of the bandage can be ensured on the wooden mast.
- the flexible strap can be made from a flexible, textile fabric such as harness or climbing harness.
- the flexible strap may be made of a synthetic material.
- the flexible strap may consist of a nylon fabric.
- the bandage has a flexible belt
- wooden poles of different diameters can be secured, since the belt adapts or clings to the curvature of the outer lateral surface of the respective wooden pole to be secured.
- the first tensioning cable and / or the second tensioning cable may be tensioning cables of the type SK9 or SK11.
- the first tensioning cable can be of type SK9.
- the second and further tensioning ropes can be of type SK11.
- the tensioning cables may e.g. have a load capacity of 25kN or 30kN.
- the static extensibility of the tensioning cables can be 3%. exhibit. In this way, settling or fatigue in the area of anchor points or in the area of the plant of the bandage can be compensated to the wooden mast to ensure a reliable backup of the wooden mast.
- the first eyelet and the second eyelet may be an integral part of the flexible strap.
- the eyelets may have been integrated into the flexible strap in a weaving process or sewing operation.
- separately provided eyelets may have been placed on the flexible strap, e.g. by sewing or riveting, wherein the eyelets can be made of a flexible fabric.
- tensioning cables can be anchored with the help of ground anchors in an environment of the wooden mast. As far as anchoring in an environment of the wooden mast is not possible due to the nature of the ground, tensioning cables can alternatively or additionally also be struck or fastened to vehicles.
- Separate cable tensioners can be provided to tension the tensioning cables. Thus, in each case a predetermined cable tension can be adjusted in a simple manner.
- the bandage can be attached tightly with its flexible belt on the lateral surface of the wooden mast, so that the exceeding of the bandage is easily made possible by a rising along the wooden mast mechanic.
- the bandage with the flexible belt has no cantilevered joints or linkage, such as cardan joints or the like, which would make it difficult to exceed the mast securing system.
- a mast securing system which is compact during use and in transportation, has a low weight and is easy to operate.
- the mast securing system has a third tensioning cable, which is adapted to be fixed to the bandage and anchored in the vicinity of the wooden mast, the bandage having an eyelet on which the third tensioning cable is attached.
- the mast securing system can be braced or braced in this way in three directions, in particular at an angular offset of about 120 °.
- the mast securing system may include three or more tensioning cables that may be attached to the bandage.
- the mast securing system may have four, five, six or more tethers that can be attached to the bandage.
- a separate eyelet may be provided on the bandage.
- two or more ropes may be attached to an eyelet.
- At each eyelet e.g. a tensioning cable or two tension cables are attached.
- the mast securing system can have a further bandage, in particular for securing an A-mast or a double mast.
- Each single mast of the A-mast or the double mast can be secured and unclamped with one bandage each.
- the tensioning cable is guided for bracing the bandage by at least a third eyelet, wherein the first tensioning cable is struck on the first eyelet, wherein the first tensioning cable is guided loosely through the third eyelet.
- the first eyelet may in particular be provided at a first end portion of the bandage.
- the third eyelet may in particular be provided at a second end portion of the bandage.
- the first tensioning cable encloses the bandage at least in sections circumferentially.
- the tensioning cable can in particular be arranged such that the flexible belt is arranged in a state mounted on the wooden pole at least in sections between the first tensioning cable and the wooden mast.
- the first tensioning cable pulls like a loop around the bandage, so that the bandage and in particular its flexible belt is pressed radially against the wooden pole.
- the first tensioning cable is guided loosely through a fourth eyelet arranged in the region of the first end section and twice guided through the third eyelet arranged on the second end section, in particular in the manner of a pulley block.
- a return of the tensioning cable through the third eye in the manner of a pulley allows a reliable attachment of the bandage to the wooden mast by the first tensioning cable.
- the bandage has an inner side and an outer side, wherein the inner side is intended to rest on the wooden pole, the outer side facing away from the inner side and the bandage having a guide which is adapted to to guide the first tensioning cable along the outside of the bandage.
- the guide prevents slipping of the first tensioning cable from the bandage or its belt during the tensioning of the bandage against the lateral surface of the wooden mast.
- the guide may be formed of one or more tabs or eyelets provided on the flexible strap.
- one or more stop means are provided for fastening a tensioning cable to an eyelet, in particular for producing a return of the first tensioning cable in the manner of a pulley. That's how it works Tensioning cable, for example, be guided by an eyelet with a lobster clasp, which can be latched, for example, in the first eyelet. In this way, with the bandage and the first tensioning cable a the wood pole circumferentially completely enclosing composite can be created, which can be opened and closed via the lobster clasp. The lobster clasp simplifies the handling and guidance of the first tensioning cable, so that the first tensioning cable does not have to be fastened or threaded again to the bandage for each assembly or tensioning operation.
- the flexible belt may have one or more reinforcing elements which are provided for engagement with the wooden mast. By means of the reinforcing elements slipping or slipping of the bandage can be avoided when tightening the tension cables.
- the reinforcing elements may consist of a rubber or have a rubber coating. As a result, improved adhesion to the lateral surface of the wooden mast can be achieved.
- the bandage can thus be specifically strengthened locally in those areas in which slipping or slipping of the bandage is to be expected when bracing the tension cables.
- the reinforcing elements can form a local thickening of a cross section of the bandage.
- the bandage in particular its flexible belt, locally have an increased material thickness.
- the bandage in the region of two end portions for example, each have a local reinforcement, which may be formed by an increased belt thickness of the flexible belt and / or by applied to the belt pads.
- a local reinforcement which may be formed by an increased belt thickness of the flexible belt and / or by applied to the belt pads.
- the attachment of the bandage to the wooden pole can be improved in a cost effective manner.
- the mast securing system may include a mounting aid for securing the bandage to the wooden pole, the mounting aid having a rod with an end mounting head for holding and sliding the bandage and for releasing and removing the bandage along the wooden mast.
- the mounting aid can be used to position the bandage without a ladder, a working platform or the like at the intended height on the wooden pole.
- the mounting head may in particular have a Z-shaped or S-shaped cross-section.
- the rod may in particular be designed as a telescopic rod.
- the shape of the mounting head may be such that a first receptacle for pushing the bandage is provided on the wooden pole, which may have a hook-shaped shape.
- the shape of the mounting head may be further such that a second receptacle is provided for withdrawing the bandage from the wood pole, which may have a hook-like shape.
- the first and second receptacle can complement each other to a cross-sectionally S-shaped or Z-shaped form.
- the mast securing system can have a compact tool for mounting and dismounting the bandage on the wooden mast.
- the mast securing system may have one or more tension straps and three or more ground anchors which are provided to secure a mast foot of the wooden mast.
- the floor sills can be hammered into the ground in the area of the mast base and clamped by means of the tension belt against the lateral surface of the wooden mast, in which the tensioning belt is placed and tightened circumferentially around the ground anchors and the wooden mast.
- the mast base is stabilized in this way.
- One or more, in particular two, carrying aids can be provided, in which components of the mast securing system can be accommodated.
- a quiver may be provided for receiving ground anchors.
- the components of the mast securing system, such as the bandage, the tensioning cables and the like, can be found completely in particular be included one or more wearing aids. This means that the safety-relevant components can be stowed safely and conveniently transported or carried.
- the first carrying aid may be provided in the manner of a quiver, which is intended for receiving ground anchors and has a shoulder strap for carrying the carrying aid by a fitter.
- a further carrying aid in the manner of a dinghy bag or the like, in which all other components of the mast securing system are accommodated, such as the bandage, tensioning cables, tensioning devices, straps or the like.
- the carrying aids may be designed so that the mast securing system can be carried by a single person.
- the bandage can first be laid around the outer surface of the wooden mast.
- the first tensioning cable which is provided for bracing the bandage against the lateral surface of the wooden mast, and for example, two more tension cables attached.
- the sliding of the bandage on the wooden pole can be done by means of a mounting aid having a telescopic rod and a mounting head, which may have in the manner described above for pushing and pulling the bandage designed recordings.
- a mounting aid having a telescopic rod and a mounting head, which may have in the manner described above for pushing and pulling the bandage designed recordings.
- the bandage With the mounting aid, the bandage can be positioned at an intended mounting height on the wooden pole.
- the assembly aid holds the bandage in place until the bandage is pressed against the wooden pole by means of the first tensioning cord.
- the bandage is secured in the intended height on the wooden pole, so that the mounting aid is no longer needed and can be removed.
- two more tensioning cables for example, at an angular offset of 120 ° to the first tensioning cable and braced and anchored to each other, so that the wooden pole is braced in three directions and anchored at three positions in the ground.
- the tensioning cables can be anchored in the vicinity of the wooden mast by means of ground anchors of the mast securing system.
- tensioning the tensioning cables clamping devices in particular cable tensioners, can be used, via which a predetermined cable tension can be adjusted.
- the wooden mast After securing the wooden mast by the mast securing system, the wooden mast can be climbed by a fitter equipped with climbing equipment to perform maintenance.
- the bandage can be removed from the wooden pole using the assembly aid.
- the tension cables are first loosened, for example, by the rope tension maintained by tensioning devices is released.
- the bandage can then be removed with the mounting aid of the wooden pole.
- the mast securing system can be stowed in one or more carrying aids and, for example, transported by a single person to a transport vehicle or another mast to be secured.
- the mast securing system therefore allows rapid assembly and disassembly on the wooden mast and is compact in storage and transport.
- Fig. 1 is a bandage 2 of a mast securing system 34 (see Fig. 3 ) in a side view and in a plan view.
- the bandage 2 has a flexible belt 4, which consists of a nylon fabric.
- the flexible belt 4 is adapted to circumferentially surround a wooden pole 38 carrying a power line at least in sections.
- the bandage 2 has a first eyelet 6, a second eyelet 8, a third eyelet 10 and a fourth eyelet 12.
- the first eyelet 6 and the fourth eyelet 12 are provided at a first end portion 14 of the bandage 2.
- the third eyelet 10 is provided at a second end portion 16 of the bandage 2. Between the first end portion 14 and the second end portion 16, a central portion 18 of the bandage 2 is formed.
- the total length a of the bandage 2 is presently 60 cm.
- the length b of the flexible belt 4 is presently 48 cm.
- the width c of the flexible belt 4 is present 9 cm.
- the bandage 2 has an inner side 20 and an outer side 22.
- the inside 20 is intended to rest on a wooden mast to be secured.
- the outer side 22 faces away from the inner side 20.
- the bandage 2 has a guide, which in the present case consists of two tabs 24 sewn onto the flexible belt 4.
- the tabs 24 are adapted to guide a tensioning cable along the outside 22 of the bandage 2.
- the flexible belt 4 has two reinforcing elements 26 which are provided for engagement with the wood mast to be secured.
- the reinforcing elements have in the present case a base of 6 cm x 9 cm.
- the reinforcing elements 26 form a local thickening of the cross section of the bandage 2.
- the reinforcing elements 26 in the present case consist of rubber.
- the reinforcing elements 26 are arranged in the region of the end sections 14, 16 of the bandage 2.
- Fig. 2 the bandage 2 is shown in two side views.
- a first tensioning cable 28 is attached, which is adapted to brace the bandage 2 against a lateral surface of a secured wooden mast and anchored in an environment of the wooden mast.
- the first tensioning cable 28 is struck with an eyelet 30 on the first eyelet 6.
- the first tensioning cable is guided by the tabs 24, the second eyelet 8 and the third eyelet 10.
- the first tensioning cable 28 is struck with a stop means, which has a snap hook on the fourth eyelet 12.
- the stop means 32 has an opening through which the first tensioning cable 28 is loosely guided.
- the first tensioning cable 28 is returned by the third eyelet 10. According to further embodiments of Invention may be provided that the first tensioning cable 28 is guided without a stop means 32 directly through the fourth eyelet 12.
- the stopper 32 with the carabiner closure simplifies the positioning of the bandage 2 on a wooden pole. So can be opened by the stop means 32 of the closed composite and placed around a wooden mast. The decoupled relative to the fourth eye 12 state of the stop means 32 is in the lower part of Fig. 2 shown.
- Fig. 3 shows a mast securing system 34 in the assembled state.
- the bandage 2 is clamped against a lateral surface 36 of a wooden mast 38.
- the first tensioning cable 28 grips the bandage 2 on the circumference and presses the flexible belt 4 against the lateral surface 36 of the wooden pole 38.
- a second tensioning cable 40 is attached to the second eyelet 8 of the bandage 2.
- a third tensioning cable 40 is struck on the first eyelet 6 of the bandage 2, to which also the first tensioning cable 28 is attached.
- the tension cables 28, 40, 42 are anchored by means of ground anchors 44 in a substrate or an environment of the wooden mast. Use rope tensioners 46 to set the desired rope tension.
- Ground anchors 44 are also provided in a foot region 48 of the wooden mast 38 in order to additionally secure the foot region 48 of the wooden mast 38.
- the ground anchors 44 in the region of the mast base 48 are clamped by means of a belt 50 against the wooden mast 38.
- the belt 50 is a tension belt.
- Fig. 4 is a section taken along the line IV-IV Fig. 3 shown to illustrate the circumferential attachment of the bandage 2 on the lateral surface 36 of the wooden mast 38.
- the first tensioning cable 28 is circumferentially guided around the flexible belt 4. Starting from the first eyelet 6, to which the first tensioning cable 28 is struck with an eyelet 30, the first tensioning cable 28 is guided by the tabs 24, the second eyelet 8, the third eyelet 10 and by the stop means 32, with which the first Tension rope rope 28 is attached to the fourth eyelet 12.
- the first tensioning cable 28 is guided twice in the manner of a pulley through the eyelet 10 and loosely by the stop means 32 to brace the drum 2 against the outer surface 36 of the wooden mast 38.
- the second tensioning cable 40 and the third tensioning cable 42 are shown in dashed lines.
- the second tensioning cable 40 and the third tensioning cable 42 are each struck with a carabiner 52 on the first eyelet 6 and the second eyelet 8, respectively.
- the eyelets, carabiners and slings consist of metal in the present case.
- the flexible belt is presently double laid and sewn to accommodate the eyelets 6, 8, 10 and 12, so that the eyelets 6, 8, 10 and 12 are held inextricably on the flexible belt 4.
- the mast securing system 34 additionally has an assembly aid 54.
- assembly aid 54 shown has a rod 56 with an end-side mounting head 58.
- the mounting head 58 is provided for holding and pushing the bandage 2 and for releasing and removing the bandage 2 along the wooden pole 38.
- the mounting head 58 has a substantially Z-shaped or S-shaped cross-section.
- Fig. 6 To illustrate the operation of the mounting aid 56, is in Fig. 6 the sliding of the bandage 2 on the wooden pole 38 and the removal of the assembly of the wooden pole 38 shown. In the left part of the picture the sliding of the bandage is shown on the wooden pole 38, as indicated by the arrow. In an analogous manner, the removal of the bandage 2 is indicated by the wooden pole 38 in the right part of the image by the downward arrow.
- the mast securing system 34 also includes the in Fig. 7
- the carrying aid 62 is a quiver for receiving the ground anchors 44.
- the ground anchors can be accommodated in tubes 64 of the quiver 62.
- the bandage 2 and the tension cables can be accommodated in the carrying aid 60.
- Both carrying aids 60, 62 each have straps 66 for the shoulders of the carrying aids 60, 62. In this way, the mast securing system 34 can be transported by a single person.
- the carrying aids 60, 62 serve to protect the mast securing system 34 during transport, for example in a vehicle.
- Fig. 8 schematically shows the sequence of a method according to the invention for securing a wooden pole 38.
- a mast securing system 34 according to the invention is provided.
- the bandage 2 is pushed onto the wooden pole 38.
- the respective tension cables are tensioned and anchored. It is understood that a postponement of the bandage 2 on the wooden pole in the manner described above can be done using an assembly aid. This applies equally to the removal of the bandage when dismantling the mast securing system from the wooden mast to be secured.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
- Emergency Lowering Means (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017201491.1A DE102017201491A1 (de) | 2017-01-31 | 2017-01-31 | Mastsicherungssystem und Verfahren zum Sichern eines Holzmastes |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3354821A1 true EP3354821A1 (fr) | 2018-08-01 |
EP3354821B1 EP3354821B1 (fr) | 2020-01-01 |
Family
ID=60923397
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18150291.5A Active EP3354821B1 (fr) | 2017-01-31 | 2018-01-04 | Système de fixation de mât et procédé de fixation d'un mât en bois |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3354821B1 (fr) |
DE (1) | DE102017201491A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109972898B (zh) * | 2019-04-01 | 2021-03-30 | 中桂电力设备有限公司 | 电杆防偏移装置 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE463096C (de) * | 1928-07-21 | Eduard Streppel | Masthalter fuer freistehende Holzmasten | |
US4318246A (en) * | 1980-03-10 | 1982-03-09 | Jungbluth Evan D | Means for securing a tree to ground stakes |
DE9211619U1 (de) * | 1992-08-28 | 1992-11-05 | NORGES Gesellschaft für Hebetechnik mbH, 2850 Bremerhaven | Sicherungseinrichtung für einen Baum |
US6389743B1 (en) * | 2000-11-08 | 2002-05-21 | Grant L. Stephenson | Tree supporting system |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1279311B (de) | 1965-03-02 | 1968-10-03 | Catu Ets | Klemmvorrichtung zum Befestigen von Abspannseilen an einem Mast |
CH693103A5 (de) | 1999-03-26 | 2003-02-28 | Centralschweizerische Kraftwer | Vorrichtung zur Sicherung von Masten. |
-
2017
- 2017-01-31 DE DE102017201491.1A patent/DE102017201491A1/de not_active Withdrawn
-
2018
- 2018-01-04 EP EP18150291.5A patent/EP3354821B1/fr active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE463096C (de) * | 1928-07-21 | Eduard Streppel | Masthalter fuer freistehende Holzmasten | |
US4318246A (en) * | 1980-03-10 | 1982-03-09 | Jungbluth Evan D | Means for securing a tree to ground stakes |
DE9211619U1 (de) * | 1992-08-28 | 1992-11-05 | NORGES Gesellschaft für Hebetechnik mbH, 2850 Bremerhaven | Sicherungseinrichtung für einen Baum |
US6389743B1 (en) * | 2000-11-08 | 2002-05-21 | Grant L. Stephenson | Tree supporting system |
Also Published As
Publication number | Publication date |
---|---|
EP3354821B1 (fr) | 2020-01-01 |
DE102017201491A1 (de) | 2018-08-02 |
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