EP2862464B1 - Semelle de chaussure antidérapante - Google Patents

Semelle de chaussure antidérapante Download PDF

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Publication number
EP2862464B1
EP2862464B1 EP14196818.0A EP14196818A EP2862464B1 EP 2862464 B1 EP2862464 B1 EP 2862464B1 EP 14196818 A EP14196818 A EP 14196818A EP 2862464 B1 EP2862464 B1 EP 2862464B1
Authority
EP
European Patent Office
Prior art keywords
ground contact
contact projections
shoe sole
slip resistant
resistant shoe
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 - Fee Related
Application number
EP14196818.0A
Other languages
German (de)
English (en)
Other versions
EP2862464A1 (fr
Inventor
Eiji Fujikawa
Tomohiro Nozaki
Ryuji Harada
Ikumasa Watanabe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nisshin Rubber Co Ltd
Original Assignee
Nisshin Rubber Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nisshin Rubber Co Ltd filed Critical Nisshin Rubber Co Ltd
Publication of EP2862464A1 publication Critical patent/EP2862464A1/fr
Application granted granted Critical
Publication of EP2862464B1 publication Critical patent/EP2862464B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B13/00—Soles; Sole-and-heel integral units
    • A43B13/14—Soles; Sole-and-heel integral units characterised by the constructive form
    • A43B13/22—Soles made slip-preventing or wear-resisting, e.g. by impregnation or spreading a wear-resisting layer
    • A43B13/223—Profiled soles
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B3/00—Footwear characterised by the shape or the use
    • A43B3/0036—Footwear characterised by the shape or the use characterised by a special shape or design
    • A43B3/0068—V-shaped

Definitions

  • the present invention relates to a slip resistant shoe sole that enables relatively stable walking even on smooth- or mirror-finished floor surfaces, floor surfaces that are slippery due to being covered with water, oil, soap, etc., floor surfaces made of stone materials as in buildings, etc., metal surfaces of manhole covers, gutter grates, etc., and the like.
  • Patent documents 1 to 8 are identified on pages 2 and 3 of the present specification.
  • Patent Document 1 Japanese Patent Document 1
  • Patent Document 2 Also known is a shoe sole having projections containing magnetic microscopic strips, the microscopic strips being oriented upright relative to the ground contact surface of the embossed portion projections and thereby generating a grip due to the hardness difference between the resin body and microscopic strips of the embossed portion, and also reinforcing the cured resin itself as a filler (Patent Document 2).
  • a slip resistant shoe sole with an improved design pattern on the ground contact surface of the sole (Patent Reference 5) in which the ground contact portion is composed of rubber, polyvinyl chloride, and polyurethane with a hardness of 54 to 62 (JIS-A, 20°C), and has a block design pattern, for example, polygons, circles, etc., formed thereon and the thinnest portion has a thickness of 3 to 8 mm.
  • the block design pattern has a design height of 1 to 7 mm, a design gradient of 0 to 3°, and a minimum size of 2 to 8 mm, with the top having no concave- convex design and being flat, so that a layer of water or oil on the floor surface can be cut, thereby suppressing block design deformation.
  • a shoe sole width improved slip resistance comprising ground contact projections that become gradually wider (inversely tapered) from the base toward the tip thereof (Patent Document 6).
  • a shoe sole wherein independent block designs, for example, polygons, circles, etc. formed on the ground contact portion of the sole collectively form a pattern over the entire shoe sole, so that the block designs are not easily depressed and the shoe sole has a bending-resistant structure (Patent Document 7).
  • JP H09 276003A discloses that some non-consecutive elements of each row can be seen as formed by the connection of two V-shaped projections. Reinforcements are not inclined.
  • slip resistant shoe soles described above do not provide fully satisfactory slip resistance because their ground contact projections are not entirely satisfactory in terms of bending resistance, deformation resistance, ground grip, and drainage of liquids present on the ground surface. This will be described below in more detail.
  • ground contact projections 23 when ground contact projections 23 with a rectangular vertical cross section are formed upright on the base 22, the ground contact projections 23 easily bend and deform as shown in Fig. 10(b) , resulting in poor bending resistance and deformation resistance and thus providing weak edge effects.
  • increasing the hardness thereof may be considered.
  • the grip of the ground contact surface is low and the sole easily slips.
  • ground contact projections 23 Even when a filler, etc., is incorporated into the ground contact projections 23 as in Patent Document 2 to enhance the grip and strength of the ground contact projections 23, sufficient strength to provide fully satisfactory bending resistance and deformation resistance cannot be achieved by ground contact projections having a rectangular vertical cross section.
  • ground contact projections 23 with a rectangular vertical cross section are formed on the base 22 in such a manner that the projections have a V-shaped horizontal cross section, the bending resistance and deformation resistance of the ground contact projections 23 are somewhat improved, but not to fully satisfactory levels.
  • ground contact projections 23 may be provided with a trapezoidal vertical cross section so that the projections 23 taper from the base 22 toward the tip. In this case, however, due to the acute angle 8 between the ground contact projections 23 and the ground surface 100 as shown in Fig. 11 , the ground contact projections 23 exhibit poor grip on the ground 100.
  • Another problem is that when the shoe treads on a liquid such as water, oil, etc., present on the ground surface 100, the liquid is likely to enter between the ground contact surface 24 of the ground contact projections 23 and the ground surface 100 because the liquid pressurized by treading is led to the boundary between the ground contact surface 24 and ground surface 100 due to the acute angle 8 between the ground contact projections 23 and the ground surface 100 as shown in Fig. 11 .
  • an object of the present invention is to provide a shoe sole with fully satisfactory slip resistance by enhancing the bending resistance and deformation resistance of the ground contact projections, while maintaining their excellent ground grip and drainage of liquid present on the ground.
  • the slip resistant shoe sole of the invention comprises a plurality of ground contact projections formed on the ground contact side of the sole base with a predetermined gap between adjacent ground contact projections in the longitudinal direction of the base.
  • the ground contact projections are arranged in a plurality of columns, with each column of ground contact projections being connected to an adjacent column thereof and being spaced apart from the other adjacent column thereof by a predetermined gap in the transverse direction of the base.
  • the ground contact projections have a V-shaped horizontal cross section. Inclined reinforcements are provided at the roots of the ground contact projections on the base.
  • the ground contact projections are formed using elastomeric polymer(s) with a JIS-A, hardness of 45 to 80 as measured at 20°C.
  • the slip resistant shoe sole may have first and second group regions separated from each other, the first group region having V-shaped ground contact projections arranged in such a manner that the V shape opens toward the toe end, and the second group region having V-shaped ground contact projections arranged in such a manner that the V shape opens toward the heel end.
  • the first and second group regions are preferably front and rear regions separated from each other. More preferably, a third region not having any ground contact projections is provided between the first and second group regions.
  • the opening angle of the V shape of the ground contact projections is in the range of 45 to 140°.
  • the ground contact projection surface has a surface roughness of not more than 28 ⁇ m.
  • the slip resistant shoe sole is formed of at least one elastomeric polymer selected from the group consisting of synthetic rubbers, natural rubbers, ethylene-vinyl acetate copolymers, polyurethane, and polyvinyl chloride, together with a rubber compounding agent.
  • the ground contact projections have a V-shaped horizontal cross section and a JIS-A hardness of 45 to 80 as measured at 20°C and inclined reinforcements are formed at the roots of the ground contact projections on the base, the present invention achieves following effects.
  • the hardness of the ground contact projections being a JIS-A hardness of 45 to 80 at 20°C, an excellent grip can be maintained while suppressing the deformation of the ground contact projections.
  • the shoe sole of the present invention has inclined reinforcements formed only at the roots of the ground contact projections. More specifically, the angle between the ground contact projections and the ground surface is 90°. Therefore, the present invention can achieve the desired bending resistance and deformation resistance while maintaining excellent grip and drainage capability, which have not been achieved by conventional ground contact projections with a trapezoidal horizontal cross section.
  • ground contact projections with a V-shaped horizontal cross section can enhance the bending resistance and deformation resistance of the ground contact projections. Drainage capability can also be enhanced by the V-shaped horizontal cross section of the ground projections.
  • a shoe sole with the desired slip resistance is thus provided by forming ground contact projections that are satisfactory in terms of all of bending resistance, deformation resistance, grip, and drainage capability.
  • Providing a predetermined gap between adjacent columns of ground contact projections in the transverse direction of the base can facilitate the drainage of liquid present on a road or floor surface and thereby enhance slip resistance.
  • Slip resistance can also be enhanced by increasing the smoothness of the ground contact projections and thereby increasing the bonding effect of the ground contact projection surface to a smooth or wet floor surface.
  • Fig. 1 is a bottom plan view illustrating the slip resistant shoe sole 1 according to this embodiment.
  • Fig. 2 is a vertical sectional view illustrating the slip resistant shoe sole 1.
  • Fig. 3 is a detailed enlarged view of an arrangement of the ground contact projections 3.
  • this slip resistant shoe sole 1 has a base 2 and a plurality of ground contact projections 3.
  • the ground contact projections 3 are provided on the ground contact side 2a of the base 2.
  • the ground contact projections 3 have a V-shaped horizontal cross section in such a manner that the V shape opens toward the toe end at an opening angle ⁇ (See Figs 1 and 3 ).
  • Inclined reinforcements 5 are formed at an inclination angle ⁇ at the roots of the ground contact projections 3 on the base 2 (see Fig. 2 ).
  • the ground contact projections 3 have a hardness of 45 to 80 as measured at 20°C according to JIS-A.
  • the V shape has an opening angle ⁇ in the range of 45 to 140°.
  • the ground contact projection surface 4 has a surface roughness of not more than 28 ⁇ m, and preferably not more than 22 ⁇ m.
  • the ground contact projections 3 are provided from the toe end to the heel end with a gap 8 between adjacent ground contact projections 3 in the longitudinal direction of the base 2.
  • the ground contact projections 3 arranged in the longitudinal direction of the base 2 are arranged in a plurality of columns, with each column of ground contact projections being spaced apart from adjacent columns thereof by a predetermined gap 7 in the transverse direction of the base 2 (see Fig. 3 ). Since the optimal gaps 7, 8 between adjacent ground contact projections 3 vary depending on several factors, such as JIS-A hardness and configuration of the ground contact projections 3, and surface roughness of the ground contact projection surface 4, they are preferably decided after conducting preliminary model tests for confirmation.
  • Examples of materials for the slip resistant shoe sole 1 include (1) elastomeric polymers selected from: natural rubbers; synthetic rubbers such as polybutadiene rubbers, polyisoprene rubbers, styrene-butadiene rubbers, acrylonitrile butadiene rubbers, nitrile rubbers, chloroprene rubbers, polyvinyl chloride rubbers, ethylene propylene (diene) rubbers, and ethylene-vinyl acetate copolymer rubbers; and thermoplastic elastic materials such as polyamide rubbers; (2) so-called polyurethane rubbers comprising polyether- and/or polyester-polyurethane, or polyurea-urethane; etc.
  • Examples of materials for the slip resistant shoe sole for specific uses include (3) elastic polymers selected from epichlorohydrin rubbers, silicone rubbers, and polysulfide rubbers.
  • the material(s) for the slip resistant shoe sole 1 may be a single kind of elastic polymer selected from the above-mentioned materials, according to the use of the shoes, or two or more kinds of compatible or high-affinity elastic polymers selected from the above-mentioned materials to provide shoe sole properties suitable for the environment of use.
  • rubber compounding agents for example, fillers such as carbon black, white carbon, etc., vulcanization accelerators, coloring agents, light resistance (weather resistance) stabilizers, etc. may be added to the elastic polymer(s).
  • the materials are subjected to specific processing to give a shoe sole-forming composition. The obtained composition is used to form the base 2 and ground contact projections 3 of the shoe sole 1.
  • elastic polymer(s) selected from synthetic rubbers, natural rubbers, ethylene-vinyl acetate copolymers, polyurethane, and polyvinyl chloride are preferably used as material(s) for producing slip resistant shoe sole 1.
  • the use of such materials for producing the slip resistant shoe sole facilitates shoe sole hardness adjustment, and adjustment of other properties such as adhesion of the sole to the upper, processability, wear resistance, etc.
  • Slip resistant shoe soles suitable for the shoes as described below can be produced by changing the material(s) of the base 2 and ground contact projections 3, hardness and arrangement of the ground contact projections 3, inclination angle ⁇ of the inclined reinforcements 5, opening angle ⁇ of the V shape of the ground contact projections 3, etc. More specifically, slip resistant shoe soles 1 adapted to the environment of use of each shoe, for example, soles suitable for indoor sports shoes; outdoor sports shoes; shoes for slippery roads such as wet roads, frozen roads, snowy roads, etc.; shoes for metal surfaces; shoes for polished floors; shoes for dry roads; or work shoes for use in specific work environments can be provided.
  • deformation of the ground contact projections 3 is suppressed by providing inclined reinforcements 5 at the roots of the ground contact projections 3 on the base 2.
  • Providing the inclined reinforcements 5 only at the roots of the ground contact projections 3 on the base 2 enables the maintenance of excellent ground grip and liquid drainage capability, while suppressing the deformation of the ground contact projections 3.
  • the optimal inclination angle ⁇ of the inclined reinforcement 5 is decided considering the use of the shoe, hardness of the ground contact projections 3, opening angle ⁇ of the V shape, arrangement of the ground contact projections 3, etc., it is usually preferable that the opening angle be in the range of 10 to 80°.
  • the horizontal cross section of the ground contact projections 3 has a V shape with an opening angle ⁇
  • enhanced strength and deformation suppression can be provided.
  • Liquid drainage enhancing effects are also provided.
  • the traction of the shoe can be maximized by setting the opening angle ⁇ of the V shape of the ground contact projections 3 to the range of 45 to 140°, although it may vary depending on the hardness of the ground contact projections 3.
  • the opening angle ⁇ is wider than this range, insufficient suppression of deformation of the ground contact projections 3 may result, depending on the direction of the load applied to the slip resistant shoe sole 1, i.e., the ground contact projections 3, during walking/running, and fail to provide sufficient traction when walking/running.
  • the JIS-A hardness of 45 to 80 of the ground contact projections can enhance deformation suppression and grip.
  • the hardness is lower than this range, deformation of the ground contact projections 3 becomes great.
  • the hardness is higher than the above-mentioned range, poor grip and insufficient traction during walking may result and the shoe tends to easily slip.
  • a surface roughness of not more than 28 ⁇ m, and more preferably not more than 22 ⁇ m, of the ground contact projection surface 4 can provide a slip resistant shoe sole that enables stable walking.
  • gaps 7, 8 in the transverse and longitudinal directions of the base 2, provided between adjacent ground contact projections 3, can enhance liquid drainage capability.
  • a first group region F having V-shaped ground contact projections 3 arranged in such a manner that the V shape opens toward the toe end may be provided in the front portion
  • a second group region R having V-shaped ground contact projections arranged in such a manner that the V shape opens toward the heel end may be provided in the rear portion.
  • a third region 9 having no ground contact projections may be provided between the first group region F and the second group region R.
  • each column of ground contact projections 3 is connected to an adjacent column thereof and spaced apart from the other adjacent column thereof by a gap 7.
  • each column of ground contact projections 3 may be connected to both adjacent columns thereof.
  • a mixed column arrangement of ground contact projections 3 is also possibly in which a column of ground contact projections 3 that is spaced apart from both adjacent columns by a gap 7 and another column of ground contact projections 3 that is connected to an adjacent column thereof and spaced apart from the other adjacent column thereof by a gap 7 are present.
  • a vulcanizing agent, a vulcanization accelerator, an antioxidant, a filler, and a coloring agent were added to a rubber material composition consisting of natural rubber and a styrene butadiene rubber, and roll-mixed to give a composition for forming shoe sole members.
  • Shoe sole member compositions of three different levels of JIS-A hardness in the range of 45 to 80, i.e., low hardness (about 45 to 55), intermediate hardness (about 56 to 65), and high hardness (about 66 to 80) were prepared by changing the proportions of vulcanizing agent, vulcanization accelerator, filler, and like ingredients.
  • the shoe sole member compositions of these three levels of hardness were formed into sheets with a thickness of about 10 mm. Each sheet was cut to a predetermined width and length to obtain cut pieces for use as shoe sole-forming members. Subsequently, slip resistant shoe soles 1 as shown in Fig. 1 were formed from the cut pieces.
  • the ground contact projections 3 were provided with inclined reinforcements 5 with an inclination angle ⁇ of about 45°. The average opening angle ⁇ of the V-shape projections was about 96°.
  • the ground contact projection surface 4 had a surface roughness of not more than 7 ⁇ m.
  • the lengthwise gap 8 was 2.5 mm and the widthwise gap 7 was 2.0 mm.
  • the kinetic friction coefficient of each shoe sole was determined according to the slip resistance test method "Technical Guidelines for Safe Shoes (RIIS-TR-90, 1991) : Slip Resistance Test Method".
  • the kinetic friction coefficient of a conventional slip resistant shoe sole was also determined.
  • Fig. 4 shows the measurement results of kinetic friction coefficients of the soles.
  • Figs. 9 and 10 show a bottom plan view and a vertical sectional view of this conventional shoe sole.
  • the ground contact projections 23 do not have any inclined reinforcements at their roots on the ground contact side 22a of the base 22; and the angle between the ground contact projection 23 and the base 22 is 90°.
  • the hardness of the ground contact projections 23 is 45 to 80°.
  • the ground contact projection surface 23 has a surface roughness of 33 ⁇ m.
  • a vulcanizing agent, a vulcanization accelerator, an antioxidant, a filler, and a coloring agent were added to a composition consisting of a mixture of natural rubber for standard shoe soles and a polybutadiene rubber, and roll-mixed to give a shoe sole material.
  • the slip resistant shoe sole 1 shown in Fig. 7 was formed using this material.
  • the inclination angle ⁇ of the inclined reinforcements 5, opening angle ⁇ of the V shape of the ground contact projections 3, surface roughness of the ground contact projection surface 4, and lengthwise gap 8 were the same as in Example 1.
  • the JIS-A hardness of the ground contact projections 3 was set to the intermediate hardness (56 to 65°).
  • FIG. 12 shows the measurement results of the kinetic friction coefficient of the thus obtained slip resistant shoe sole measured in the same manner as in Example 1.
  • the kinetic friction coefficient of the conventional shoe sole used in Example 1 above is also shown in Fig. 12.
  • Fig. 12 clearly shows that, as with the slip resistant shoe soles of Example 1, the slip resistant shoe sole of Example 2 has highly excellent slip resistance.
  • the slip resistant rubber sole structure of the invention is applicable to normal shoes; work shoes for use in particularly slippery work environments; and nursing care shoes and shoes for disabled persons. It is also applicable to mats for placing articles thereon, slip resistant materials for chairs, tables, etc., tires for light vehicles, wheelchairs, etc., conveyor belts, and so on.

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  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)

Claims (7)

  1. Semelle de chaussure antidérapante (1) comprenant une pluralité de saillies (3) de contact avec le sol formées sur le côté (2a) de contact avec le sol de la base de semelle (2) avec un espace prédéterminé (8) entre des saillies adjacentes de contact avec le sol dans la direction longitudinale de la base (2),
    les saillies (3) de contact avec le sol sont agencées en une pluralité de colonnes, chaque colonne de saillies (3) de contact avec le sol étant raccordée à une colonne adjacente de celles-ci et étant espacée de l'autre colonne adjacente de celles-ci par un espace prédéterminé (7) dans la direction transversale de la base (2),
    les saillies (3) de contact avec le sol présentant une section transversale horizontale en forme de V, comportant des renforts inclinés prévus au niveau des emplantures des saillies (3) de contact avec le sol sur la base (2), et étant formées en utilisant un polymère élastomère avec une dureté JIS-A de 45 à 80 telle qu'elle est mesurée à 20°C.
  2. Semelle de chaussure antidérapante (1) selon la revendication 1, comprenant des première et deuxième régions de groupe séparées l'une de l'autre, la première région de groupe (F) comportant des saillies (3) de contact avec le sol en forme de V agencées de manière telle que la forme de V s'ouvre vers l'extrémité à orteils, et la seconde région de groupe (R) comportant des saillies (3) de contact avec le sol en forme de V agencées de manière telle que la forme de V s'ouvre vers l'extrémité à talon.
  3. Semelle de chaussure antidérapante (1) selon la revendication 2, dans laquelle les première et deuxième régions de groupe sont des régions avant et arrière séparées l'une de l'autre.
  4. Semelle de chaussure antidérapante (1) selon la revendication 3, dans laquelle une troisième région (C) ne comportant pas de saillies (3) de contact avec le sol est prévue entre la première région de groupe (F) et la deuxième région de groupe (R).
  5. Semelle de chaussure antidérapante (1) selon la revendication 1, dans laquelle l'angle d'ouverture (β) de la forme de V des saillies (3) de contact avec le sol est dans la plage de 45 à 140°.
  6. Semelle de chaussure antidérapante (1) selon la revendication 1, dans laquelle la surface (4) à saillies de contact avec le sol possède une rugosité de surface non supérieure à 28 µm.
  7. Semelle de chaussure antidérapante (1) selon la revendication 1, qui est formée d'au moins un polymère élastomère sélectionné parmi le groupe constitué de caoutchoucs synthétiques, de caoutchoucs naturels, de copolymères éthylène-acétate de vinyle, de polyuréthanne, et de chlorure de polyvinyle, conjointement avec un agent de formulation de caoutchouc.
EP14196818.0A 2004-07-01 2005-02-25 Semelle de chaussure antidérapante Expired - Fee Related EP2862464B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004220951 2004-07-01
EP05710737.7A EP1762151B1 (fr) 2004-07-01 2005-02-25 Semelle de chaussure anti-glissement

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP05710737.7A Division-Into EP1762151B1 (fr) 2004-07-01 2005-02-25 Semelle de chaussure anti-glissement
EP05710737.7A Division EP1762151B1 (fr) 2004-07-01 2005-02-25 Semelle de chaussure anti-glissement

Publications (2)

Publication Number Publication Date
EP2862464A1 EP2862464A1 (fr) 2015-04-22
EP2862464B1 true EP2862464B1 (fr) 2016-02-24

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EP05710737.7A Active EP1762151B1 (fr) 2004-07-01 2005-02-25 Semelle de chaussure anti-glissement
EP14196818.0A Expired - Fee Related EP2862464B1 (fr) 2004-07-01 2005-02-25 Semelle de chaussure antidérapante

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Country Status (5)

Country Link
US (1) US20090188132A1 (fr)
EP (2) EP1762151B1 (fr)
JP (1) JP3959648B2 (fr)
CN (1) CN100438795C (fr)
WO (1) WO2006003740A1 (fr)

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CN100438795C (zh) 2008-12-03
EP1762151A1 (fr) 2007-03-14
US20090188132A1 (en) 2009-07-30
JPWO2006003740A1 (ja) 2008-04-17
EP1762151A4 (fr) 2009-04-01
CN1976606A (zh) 2007-06-06
JP3959648B2 (ja) 2007-08-15
EP2862464A1 (fr) 2015-04-22
WO2006003740A1 (fr) 2006-01-12

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