JP2009117596A - Connecting structure and method of magnetic shield panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an open shield panel structure that is improved in easiness for connecting edges between panels. <P>SOLUTION: In a magnetic shield panel 1, rectangle magnetic steel sheets 13 with thicknesses set to be the same as the short side of the rectangular cross-section are embedded in a plurality of stages at predetermined intervals in the direction of a sheet thickness in the panel core material, and both ends of the rectangle magnetic steel sheets 13 in a longitudinal direction project from side ends of the panel core material 12. The magnetic shield panels are arranged adjacently so that ends of the rectangle magnetic steel sheet 13 may be separated from each other with almost the same height in each stage. Then, a magnetic steel sheet 17 for connection is installed on one or more surfaces of either the upper or lower surfaces of ends of the rectangle magnetic steel sheets 13 arranged adjacently to each other. Furthermore, the rectangle magnetic steel sheet 13 is firmly attached to the magnetic steel sheet 17 for connection. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a magnetic shield panel connection structure suitable for shielding the influence of magnetism from a closed space using magnetism to the outside, or shielding the influence of magnetism from the outside to a closed space using magnetism, and Regarding the method.

  In so-called magnetism measurement systems such as magnetoencephalography and magnetocardiogram measurement, such as biomagnetism measurement systems that measure and detect weak magnetic fields, and electron beam drawing devices that draw fine circuit patterns with electron beams during semiconductor manufacturing processes. It is necessary to ensure normal operation by preventing the measurement magnetic field and electron beam from being affected by the magnetic field from the outside. Moreover, in order to protect other equipment from the magnetic influence of such a magnetic utilization apparatus, the request | requirement with respect to the magnetic shield wall body which covers a magnetic shield object space with a wall surface is increasing.

  Conventional magnetic shield walls include, for example, high-permeability directional electrical steel sheets, non-oriented electrical steel sheets, permalloy, soft magnetic steel sheets, amorphous, microcrystalline magnetic materials obtained by crystallizing liquid quenching ribbons, etc. A so-called hermetic magnetic shield structure is proposed in which a magnetic plate constitutes a wall surface of a shield target space. However, this hermetically sealed magnetic shield structure has problems that it may be difficult to obtain the shielding characteristics expected from the material characteristics of the magnetic material, and that air and light permeability cannot be obtained. It was.

For this reason, a so-called open type magnetic shield structure in which groups of magnetic material plates are arranged in a bowl shape or a louver shape has been proposed (see, for example, Patent Documents 1 to 3). In this open type magnetic shield structure, a strip-shaped or long magnetic material plate is laminated in a plurality of stages at a predetermined interval in the plate thickness direction to form a row-shaped housing. It has been experimentally confirmed that by constructing such a row-shaped housing, a high shielding performance is exhibited as compared with a sealed magnetic shield structure. Also, this open type magnetic shield structure has good air and light permeability.
JP 2002-164686 A JP 2006-351598 A PCT / JP2004 / 003457

  By the way, in the open type magnetic shield panel structure as described above, for example, as shown in FIG. 9A, a single magnetic material plate 74 is formed by laminating a plurality of thin magnetic material plates 78 in the thickness direction. There is also a case. At this time, an uneven structure formed by protrusion of the magnetic material thin plate 78 is formed on the laminated cross section in the longitudinal direction by making the edges of the magnetic material thin plate 78 uneven, and two magnetic materials are formed as shown in FIG. 9B. The body 74 can be connected in a row or ring by fitting the unevenness of the edge. In particular, as the number of irregularities on the edge is increased and the number of magnetic material thin plates 78 constituting the one irregularity is reduced, the magnetic flux leakage can be further reduced.

  However, since the pitch of the unevenness of the edge is small, when the two magnetic material bodies 74 are actually combined, the unevenness of the edge is reduced when a slight positional shift or dimensional shift occurs. There was a problem that it could not be fitted. Further, in the disclosed technique of Patent Document 3, as shown in FIG. 9C, the number of the magnetic material thin plates 78 constituting one unevenness is increased as shown in FIG. 79 examples of bodies are also disclosed.

  However, there are not a few cases where such a magnetic material body 79 is attached to the left and right and upside down, and there has been a problem that the edges cannot be fitted due to such slight construction and processing errors. . In addition, there are cases where specific amounts such as slight positional deviations and dimensional deviations are actually found at the time of construction on site, but such deviations are corrected immediately in the magnetic material body 79 as described above. There was a problem that could not be done.

  Therefore, the present invention has been devised in view of the above-described problems, and an object of the present invention is to provide an open type magnetic shield panel structure that improves the ease of connecting the edges between the panels.

  In order to solve the above-described problems, the magnetic shield panel connection structure according to claim 1 of the present invention is a strip-shaped electrical steel sheet having a rectangular cross-section with a short side having a thickness as a predetermined interval in the thickness direction inside the panel core. A magnetic shield panel embedded in a plurality of stages and having both end portions in the longitudinal direction of the strip-shaped electrical steel sheet projecting from the side end portions of the panel core member, the end portion of the strip-shaped electrical steel sheet Are arranged adjacent to each other at substantially the same height at each step, and are connected to one or more of the upper and lower surfaces of the end portions of each of the strip-shaped magnetic steel sheets in the adjacently arranged magnetic shield panels. The strip-shaped electromagnetic steel sheet and the connecting electromagnetic steel sheet are fixed by a fixing means.

  The magnetic shield panel connection structure according to claim 2 of the present application is the invention according to claim 1, wherein the fastening means is a clip and / or an adhesive.

  The connection structure of the magnetic shield panel according to claim 3 of the present application is the invention according to claim 1 or 2, wherein the connection structure is formed on one or more of the upper and lower surfaces of the end of the strip-shaped electromagnetic steel sheet on which the electromagnetic steel sheet for connection is installed. By laminating thin spacers made of a magnetic material, the contact surface of the connecting electromagnetic steel sheet is adjusted to be horizontal.

  The connection structure of the magnetic shield panel according to claim 4 of the present application is the invention according to any one of claims 1 to 3, wherein the total sum B of the cross-sectional areas of the electromagnetic steel sheets for connection is that of the strip-shaped electromagnetic steel sheets. The cross-sectional area is larger than A.

  In the method of connecting magnetic shield panels according to claim 5 of the present application, a strip-shaped electrical steel sheet having a rectangular cross section having a short side as a plate thickness is embedded in a plurality of stages at predetermined intervals in the plate thickness direction inside the panel core. The electromagnetic shield panel in which both end portions in the longitudinal direction of the strip-shaped electrical steel sheet are respectively protruded from the side end portions of the panel core material, and the end portions of the strip-shaped electrical steel sheet are substantially the same height for each step. Are arranged adjacent to each other so as to be separated from each other, and a connecting electromagnetic steel sheet is installed on one or more of the upper and lower surfaces of the end of each of the adjacently arranged rectangular electromagnetic steel sheets. And the above-mentioned electrical steel sheet for connection.

  According to a sixth aspect of the present invention, there is provided a magnetic shield panel coupling method according to the fifth aspect of the present invention, wherein the strip-shaped electrical steel sheet and the electrical steel sheet for connection are fastened by a clip and / or an adhesive. And

  The method for connecting magnetic shield panels according to claim 7 of the present invention is the invention according to claim 5 or 6, wherein at least one of the upper and lower surfaces of the end of the strip-shaped electrical steel sheet on which the electrical steel sheet for connection is installed is installed. By laminating thin spacers made of a magnetic material, the contact surface of the connecting electrical steel sheet is adjusted to be horizontal.

  The connection method of the magnetic shield panel according to claim 8 of the present application is the connection comprising the sum B of the cross-sectional areas larger than the cross-sectional area A of the strip-shaped electrical steel sheet according to any one of claims 5 to 7. It is characterized in that an electromagnetic steel plate is installed.

  In the magnetic shield panel connection structure to which the present invention having the above-described configuration is applied, a connection electromagnetic steel sheet is installed on at least one of the upper and lower surfaces of the strip-shaped electromagnetic steel sheet. That is, since the electromagnetic steel plates can be continued even in the connecting portion of the magnetic shield panel, the magnetic steel plates arranged in a bowl shape or a louver shape are not interrupted in the connecting portion, and the entire surface of the magnetic shield panels connected to each other is prevented. The magnetic shield performance can be exhibited over the entire area.

  Moreover, in the connection structure of the magnetic cider panel to which the present invention is applied, it is configured to be flush without providing irregularities or steps on the edge of the strip-shaped electromagnetic steel sheet. For this reason, since the process of fitting the unevenness | corrugations of an edge can be eliminated, it becomes impossible to make a mutual fitting impossible by the slight position shift and the shift | offset | difference of a dimension. Moreover, in the strip-shaped electrical steel sheet, since there are no irregularities or steps on the edge, it is possible to realize mutual connection even when attached to the left and right and upside down.

  Furthermore, in the connection structure of the magnetic cider panel to which the present invention is applied, the connection of the electromagnetic steel sheet for connection to the electromagnetic steel sheet for strips is fixed by an extremely simple fixing means such as a clip or an adhesive. Therefore, the burden of construction labor can be eliminated, and the construction period can be shortened.

  Hereinafter, as a best mode for carrying out the present invention, a connecting structure of magnetic shield panels constituting a part of a wall body that shields magnetism will be described in detail with reference to the drawings.

  1 and 2 show the configuration of a magnetic shield wall 5 to which the connecting structures 2 and 3 of the magnetic shield panel 1 to which the present invention is applied are applied. Incidentally, FIG. 1 is a perspective view of the magnetic shield wall body 5, FIG. 2 (a) is a plan view thereof, and FIG. 2 (b) is a front view thereof.

  The magnetic shield wall 5 covers, for example, a magnetic shield target space in which a so-called magnetic utilization device such as a biomagnetism measurement system or an electron beam drawing apparatus is disposed with a wall surface. The magnetic shield wall 5 is configured by combining the magnetic shield panels 1 with each other. The magnetic shield panel 1 is connected to other magnetic shield panels 1 adjacent to each other to form connection structures 2 and 3, respectively. The connection structure 2 is a structure for connecting the electromagnetic steel plates 13 in the magnetic shield panels 1 adjacent to each other in the horizontal direction, and the connection structure 3 includes the electromagnetic steel plates 13 at the intersections where the wall bodies intersect each other in the vertical direction. It is the structure for connecting via.

  FIG. 3 shows a perspective view of the magnetic shield panel 1. The magnetic shield panel 1 is configured such that a pair of conductive metal plates 11 are provided facing each other, and a panel core material 12 is filled between the pair of metal plates 11. In addition, a strip-shaped electromagnetic steel sheet 13 (hereinafter referred to as a strip-shaped electromagnetic steel sheet 13) is embedded in the magnetic shield panel 1.

  The upper structure of the magnetic shield panel 1 is formed by bending the upper ends of both of the pair of metal plates 11 inwardly and upwardly to form at least a first contact surface 14. The lower structure of the magnetic shield panel 1 is formed by bending the lower ends of both of the pair of metal plates 11 inward to form at least a second contact surface 15. By configuring the upper part and the lower part of the magnetic shield panel 1 in this way, when the magnetic shield panel 1 is stacked in the vertical direction and fitted, the first contact surface 14 and the second contact surface 15 It is possible to prevent the radio waves from leaking from the contact surfaces 14 and 15.

  As the metal plate 11, a galvalume steel plate or a galvanized steel plate as an aluminum-zinc alloy plated steel plate is applied. A coating film such as a galvalume steel plate, a galvanized steel plate, or a stainless steel plate is usually used as it is, but may be peeled off. Incidentally, as the metal plate 11, a stainless steel plate, an aluminized steel plate or the like may be applied. That is, the metal plate 11 made of such a material is inexpensive and can exhibit a high electromagnetic shielding ability. Moreover, this metal plate 11 is not limited to the case where it is provided on both surfaces of the panel core member 12, and may be provided on any one surface. When the magnetic shield panel 1 has only the magnetic shielding performance and does not have the electromagnetic shielding performance, the metal plate 11 may be omitted.

  The panel core 12 is preferably made of a heat insulating material, but may be made of any material. In the following example, the case where the panel core 12 is made of rock wool will be described as an example. That is, rock wool is an artificial mineral fiber formed by mixing lime or the like with basalt, steel slag, etc., and dissolving at high temperature. In addition, as an example of this panel core material 12, you may make it use fiber-type heat insulating materials, such as glass wool and carbonized cork, and foam-type heat insulating materials, such as a calcium silicate, water-repellent perlite, or a polyethylene foam. A material may be used. Furthermore, a foamed inorganic heat insulating material such as glass foam may be applied.

  That is, the magnetic shield panel 1 is basically configured to fill the panel core material 12 between the pair of metal plates 11. For this reason, electromagnetic waves incident from the outside can be reflected by the metal plate 11.

  The strip-shaped electrical steel sheet 13 is made of a strip-shaped magnetic body, and is made of, for example, an electrical steel sheet having a permeability in the longitudinal direction larger than a permeability in the cross-sectional direction. The strip-shaped electromagnetic steel sheet 13 is embedded in a plurality of stages at a predetermined interval in the sheet thickness direction C when the short side of the rectangular cross section is defined as the sheet thickness. The strip-shaped electrical steel sheet 13 has both end portions in the longitudinal direction protruding from the side end portions of the panel core material. The strip-shaped electromagnetic steel sheet 13 may be configured as a single electromagnetic steel sheet by laminating a plurality of thin magnetic material sheets in the thickness direction.

  The magnetic shield panel 1 having such a configuration has a so-called open type magnetic shield structure in which a group of magnetic steel plates 13 made of a magnetic material are arranged in a bowl shape or a louver shape. As a result, high magnetic shielding performance can be exhibited. In addition, the magnetic shield panel 1 also has good air and light permeability by arranging the electromagnetic steel plates 13 in a bowl shape or a louver shape.

  When connecting the magnetic shield panels 1 having such a configuration, they are arranged adjacent to each other as shown in FIGS. At this time, by arranging all the intervals between the strip-shaped electrical steel sheets 13 between the adjacent panels, when the magnetic shield panels 1 are disposed adjacent to each other, the ends of the strip-shaped electrical steel sheets 13 are substantially omitted for each step. They are arranged at the same height and separated from each other.

  4 is an enlarged view of the structure of the connecting structure 2 of the magnetic shield panel 1. FIG. 4 (a) shows a plan view thereof, and FIG. 4 (b) shows a front view thereof. On the upper and lower surfaces of the strip-shaped electrical steel sheet 13 in which the respective end portions are spaced apart from each other at substantially the same height, a connecting electrical steel sheet 17 is further installed. The electromagnetic steel plate 17 is fixed to the strip-shaped electromagnetic steel plate 13 by fixing means.

  FIG. 5 shows an example in which the electromagnetic steel plate 17 and the strip-shaped electromagnetic steel plate 13 are fixed by the clip 20 as an example of the fixing means. Incidentally, the clip 20 is effective in that the electromagnetic steel plate 17 and the strip-shaped electromagnetic steel plate 13 can be fixed relatively easily. Note that an adhesive may be used instead of the clip 20 as the fastening means. In such a case, an adhesive is applied between the electromagnetic steel sheet 17 and the strip-shaped electromagnetic steel sheet 13, and these are adhered to each other.

  The connecting order of the magnetic shield panel 1 is as follows: the adjacent arrangement of the magnetic shield panel 1, the construction of the connecting electromagnetic steel sheet 17, and the fastening of the strip-shaped electromagnetic steel sheet 13 and the connecting electromagnetic steel sheet 17. Become.

  FIG. 6 is an enlarged view of the structure of the connecting structure 3 of the magnetic shield panels 1 constituting the intersecting portion where the wall bodies intersect each other in the vertical direction. FIG. 6 (a) is a plan view thereof and FIG. (b) shows a front view thereof.

  The end portion of the strip-shaped electromagnetic steel sheet 13 protruding from the panel core 12 is formed in a substantially triangular shape as shown in FIG. As a result, it is possible to arrange the strip-shaped electromagnetic steel sheets 13 having such a shape so as to cross each other from the vertical direction so that the end surfaces of the strip-shaped electromagnetic steel sheets 13 face each other in an oblique direction. Further, on the upper and lower surfaces of the strip-shaped electromagnetic steel sheet 13, a connecting electromagnetic steel sheet 17 is installed. Similarly, the electromagnetic steel plate 17 is fixed to the strip-shaped electromagnetic steel plate 13 by a fixing means such as a clip 20 or an adhesive. In addition, in this connection structure 3, the shape of the edge part of the strip-shaped electromagnetic steel plate 13 protruded from the panel core 12 is not limited to the case where it is a substantially triangular shape, The strip-shaped electromagnetic steel plate 13 which mutually cross | intersects. As long as the end portions are separated from each other, they may be formed in any shape. In the connection structure 3 as well, the strip-shaped electromagnetic steel sheet 13 and the electromagnetic steel sheet 17 are similarly fixed by a fixing means such as a clip 20 or an adhesive.

  In the connecting structures 2 and 3 of the magnetic shield panel 1 to which the present invention is applied, having the above-described configuration, a connecting electromagnetic steel sheet 17 is installed on one or more of the upper and lower surfaces of the strip-shaped electromagnetic steel sheet 13. That is, since the electromagnetic steel plates can be made continuous at the connection portion of the magnetic shield panel 1, the magnetic steel plates arranged in a bowl shape or a louver shape are not interrupted at the connection portion, and the magnetic shield panels 1 connected to each other. The magnetic shield performance can be exhibited over the entire surface.

  Moreover, in the connection structures 2 and 3 of the magnetic cider panel 1 to which the present invention is applied, the strip-shaped electromagnetic steel sheet 13 is configured to be flush without providing irregularities or steps on the edge. For this reason, since the process of fitting the unevenness | corrugations of an edge can be eliminated, it becomes impossible to make a mutual fitting impossible by the slight position shift and the shift | offset | difference of a dimension. In addition, since the strip-shaped electromagnetic steel sheet 13 has no irregularities or steps on the edge, it is possible to realize mutual connection even when the strip-shaped electromagnetic steel sheet 13 is attached upside down and upside down.

  Further, in the connection structures 2 and 3 of the magnetic cider panel 1 to which the present invention is applied, the connection of the electromagnetic steel plate 17 for connection to the electromagnetic steel plate 13 for strips is extremely simple including a clip 20 and an adhesive. Since it can be fastened by the fastening means, the burden of construction labor can be eliminated, and the construction period can be shortened.

  In the connection structures 2 and 3 of the magnetic cider panel 1 to which the present invention is applied, the connection is not limited to the case where the electromagnetic steel plates 17 for connection are provided on both the upper and lower surfaces of the strip-shaped electromagnetic steel plates 13. It may be provided on one side. If at least the electromagnetic steel plate 17 is installed on either of the upper and lower surfaces of the strip-shaped electromagnetic steel plates 13 to be connected to each other, a magnetic path is formed, and the intended effect of the present invention can be obtained. Because.

  Further, in the present invention, the electromagnetic steel plate 17 and the strip-shaped electromagnetic steel plate 13 are fixed by the clip 20, and an adhesive is applied between the electromagnetic steel plate 17 and the strip-shaped electromagnetic steel plate 13, and these are adhered to each other. You may make it do. Thereby, it becomes possible to improve especially adhesiveness between the electromagnetic steel plate 17 and the strip-shaped electromagnetic steel plate 13 with the press by the clip 20, and the adhesive force by an adhesive agent.

  Moreover, it is desirable that the total sum B of the cross-sectional areas of the connecting electromagnetic steel sheets 17 is larger than the cross-sectional area A of the strip-shaped electromagnetic steel sheets. The example of FIG. 7 shows an example in which the sum B of the cross-sectional area B1 of the electromagnetic steel plate 17a and the cross-sectional area B2 of the electromagnetic steel plate 17b is thicker than the cross-sectional area A. Thereby, it is possible to prevent the magnetic path from being unduly narrowed by installing the electromagnetic steel sheet 17 and to prevent the magnetic shield performance from being deteriorated in the connection structures 2 and 3.

  In the present invention, if a positional deviation or a dimensional deviation occurs and the upper and lower surfaces are shifted in the vertical direction between the strip-shaped electromagnetic steel sheets 13 to be connected to each other as shown in FIG. You may make it laminate | stack the thin spacer 24 comprised. Thereby, it becomes possible to adjust so that the contact surface of the electromagnetic steel sheet 17 for connection becomes horizontal, and it becomes possible to obtain the effect of the present invention. Incidentally, in the example of FIG. 8, the case where the thin spacer 24 is laminated only on the upper surface of the strip-shaped electrical steel sheet 13 is shown, but the present invention is not limited to this, and the other strip-shaped electrical steel sheet 13 is not limited thereto. Of course, the thin spacer 24 may be laminated on the lower surface, and the connecting electromagnetic steel sheet 17 may be fixed from both the upper and lower sides.

It is a perspective view of the electromagnetic wave shield wall body to which the electromagnetic wave shield panel to which the present invention is applied is applied. It is the top view and front view of the electromagnetic wave shielding wall body to which the electromagnetic wave shielding panel to which the present invention is applied is applied. It is a perspective view of an electromagnetic wave shield panel. It is a block diagram of the connection structure of an electromagnetic wave shield panel. It is a figure for demonstrating the example which fixes an electromagnetic steel plate and a strip-shaped electromagnetic steel plate with a clip. It is a block diagram of the connection structure of the magnetic shield panel which comprises the cross | intersection part where a wall body mutually cross | intersects a perpendicular direction. It is a figure for demonstrating the structural example of the board thickness of an electromagnetic steel plate. It is a figure which shows the example which laminates | stacks a thin spacer. It is a figure for demonstrating the problem of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnetic shield panel 2, 3 Connection structure 5 Magnetic shield wall 11 Metal plate 12 Panel core material 13, 17 Electrical steel plate 14 1st contact surface 15 2nd contact surface 20 Clip

Claims (8)

A strip-shaped electrical steel sheet having a thickness of the short side of the rectangular cross section is embedded in the panel core material in a plurality of stages at a predetermined interval in the thickness direction, and both ends in the longitudinal direction of the strip-shaped electrical steel sheet are The magnetic shield panels respectively protruding from the side end portions of the panel core material are configured to be adjacently arranged with the end portions of the strip-shaped electromagnetic steel plates being spaced apart from each other at substantially the same height for each step,
A magnetic steel sheet for connection is installed on one or more of the upper and lower surfaces of the end portions of each of the strip-shaped magnetic steel sheets in the adjacent magnetic shield panels,
Further, the magnetic shield panel connection structure, wherein the strip-shaped electrical steel sheet and the connection electrical steel sheet are fastened by fastening means. The magnetic shield panel connection structure according to claim 1, wherein the fastening means is a clip and / or an adhesive. The contact surface of the electrical steel sheet for connection is formed by laminating a thin spacer made of a magnetic material on at least one of the upper and lower surfaces of the end of the strip-shaped electrical steel sheet on which the electrical steel sheet for connection is installed. The magnetic shield panel connection structure according to claim 1, wherein the magnetic shield panel is adjusted to be horizontal. 4. The magnetic shield panel connection structure according to claim 1, wherein a sum B of cross-sectional areas of the electromagnetic steel sheets for connection is larger than a cross-sectional area A of the strip-shaped electromagnetic steel sheets. . A strip-shaped electrical steel sheet having a thickness of the short side of the rectangular cross section is embedded in the panel core material in a plurality of stages at a predetermined interval in the thickness direction, and both ends in the longitudinal direction of the strip-shaped electrical steel sheet are The electromagnetic shield panels protruding from the side end portions of the panel core are arranged adjacent to each other so that the end portions of the strip-shaped electromagnetic steel sheets are spaced apart from each other at substantially the same height for each step,
A magnetic steel sheet for connection is installed on one or more of the upper and lower surfaces of the end of each of the strip-shaped magnetic steel sheets arranged adjacent to each other,
The magnetic shield panel connection method further comprising: fastening the strip-shaped electrical steel sheet and the electrical steel sheet for connection. 6. The method of connecting magnetic shield panels according to claim 5, wherein the strip-shaped electrical steel sheet and the electrical steel sheet for connection are fastened with a clip and / or an adhesive. The contact surface of the electrical steel sheet for connection is laminated by laminating a thin spacer made of a magnetic material on one or more of the upper and lower surfaces of the end of the strip-shaped electrical steel sheet on which the electrical steel sheet for connection is installed. The method for connecting magnetic shield panels according to claim 5, wherein the magnetic shield panel is adjusted to be horizontal. The connection of magnetic shield panels according to any one of claims 5 to 7, wherein an electromagnetic steel sheet for connection comprising a sum B of cross-sectional areas larger than the cross-sectional area A of the strip-shaped electromagnetic steel sheet is installed. Method.

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