EP1555233B1 - Rope for elevator - Google Patents
Rope for elevator Download PDFInfo
- Publication number
- EP1555233B1 EP1555233B1 EP02777961.0A EP02777961A EP1555233B1 EP 1555233 B1 EP1555233 B1 EP 1555233B1 EP 02777961 A EP02777961 A EP 02777961A EP 1555233 B1 EP1555233 B1 EP 1555233B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strands
- main body
- wires
- rope
- elevator
- 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 - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B7/00—Other common features of elevators
- B66B7/06—Arrangements of ropes or cables
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B7/00—Other common features of elevators
- B66B7/06—Arrangements of ropes or cables
- B66B7/062—Belts
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/22—Flat or flat-sided ropes; Sets of ropes consisting of a series of parallel ropes
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2083—Jackets or coverings
- D07B2201/2087—Jackets or coverings being of the coated type
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2501/00—Application field
- D07B2501/20—Application field related to ropes or cables
- D07B2501/2007—Elevators
Definitions
- the present invention relates to a belt-shaped elevator rope used in an elevator to suspend a car.
- WO 00/37 738 A1 discloses an elevator rope for suspending an elevator car comprising a belt-shaped rope main body having a plurality of strands in which a plurality of wires are laid parallel, and a coating body made of a resin for covering the strands, the strands being disposed side by side in a cross section perpendicular to a longitudinal direction of the rope main body.
- the present invention aims to solve the above problems and an object of the present invention is to provide an elevator rope capable of ensuring stable strength and enabling extension of service life.
- an elevator rope for suspending an elevator car comprising a belt-shaped rope main body, wherein: the rope main body has a plurality of strands in which a plurality of wires are laid parallel; and a coating body made of a resin for covering and integrating the strands; and the strands are disposed side by side in a cross section perpendicular to a longitudinal direction of the rope main body.
- an elevator rope for suspending an elevator car comprising a belt-shaped rope main body, wherein: the rope main body has: a plurality of strand assemblies including a core member made of a resin extending in a longitudinal direction of the rope main body, and a plurality of strands disposed around the core member and laid together with the core member; and a coating body made of a resin for covering and integrating the strand assemblies; the strands include a plurality of wires laid parallel to each other; and the strand assemblies are disposed side by side in a cross section perpendicular to a longitudinal direction of the rope main body.
- FIG 1 is a cross section of an elevator rope according to Embodiment 1 of the present invention.
- a belt-shaped rope main body 1 has: seven strands 2; and a coating body 3 made of a resin for covering and integrating the strands 2.
- Each of the strands 2 has a plurality of steel wires 4.
- the wires 4 are laid parallel to each other (See Japanese Industrial Standards (JIS) G 3525 12.2 b). All of the wires 4 are laid parallel in all of the strands 2.
- the strands 2 are disposed side by side in a cross section perpendicular to a longitudinal direction of the rope main body 1 ( Figure 1 ).
- the seven strands 2 are disposed so as to line up in a straight line at a distance from each other in a width direction of the rope main body 1 (left-to-right in Figure 1 ) in the cross section perpendicular to the longitudinal direction of the rope main body 1.
- a diameter of the wires 4 is made approximately 1/400 of a diameter of a sheave (not shown) around which the rope main body 1 is wound. In this manner, bending stresses generated by the sheave are reduced, enabling fatigue resistance to be improved. Furthermore, in order to avoid making the diameter of the wires 4 considerably slenderer, it is preferable for the cross-sectional construction of the strands 2 to be a Warrington type rather than a Seale type or a filler wire type as defined in JIS G 3525.
- the coating body 3 is composed of a thermoplastic ether-based polyurethane resin, for example.
- An adhesive 5 is applied to at least an outer peripheral portion of each of the strands 2 to integrate the strands 2 with the coating body 3. That is, the strands 2 and the coating body 3 are bonded to each other by means of the adhesive 5. Timing of the application of the adhesive 5 may be either before or after the laying together of the wires 4.
- the wires 4 constituting each of the strands 2 are laid parallel to each other, the wires 4 are in line contact with each other and restrain each other. Consequently, contact pressure among the wires 4 is reduced, making internal friction less likely to occur in the strands 2, thereby also enabling stable strength to be ensured and also enabling extension of service life.
- the strands 2 will break in descending order of magnitude of load burden, or in descending order of severity of damage. In regard to this, even if the number of strands 2 is increased as a preventive measure, a strength increase proportional to the number of strands 2 cannot be expected since it is difficult to make the load burden on each of the strands 2 uniform.
- the residual strength at the point in time when JIS replacement criteria are reached is in the order of a 5 percent (5%) reduction from a standard value since a safety margin from a standard breaking load is provided.
- the material of the coating body 3 is not limited to a thermoplastic ether-based polyurethane resin, and appropriate selection in response to service conditions is possible. However, if used in a high-temperature, high-humidity environment, a hard ether-based polyurethane, in which hydrolysis is less likely to occur, is preferable to an ester-based polyurethane, in which hydrolysis occurs easily.
- FIG. 2 is a cross section of an elevator rope according to Embodiment 2 of the present invention.
- a belt-shaped rope main body 11 has: seven strand assemblies 12; and a coating body 13 made of a resin for covering and integrating the strand assemblies 12.
- the strand assemblies 12 are disposed side by side in a cross section perpendicular to a longitudinal direction of the rope main body 11.
- the seven strand assemblies 12 are disposed so as to line up in a straight line at a distance from each other in a width direction of the rope main body 11 in a cross section perpendicular to the longitudinal direction of the rope main body 11.
- Each of the strand assemblies 12 respectively includes: a core member 14 made of a resin extending in a longitudinal direction of the rope main body 11; and three strands 15 disposed around the core member 14 and laid together with the core member 14.
- Each of the strands 15 has a plurality of steel wires 16. The wires 16 are laid parallel to each other. All of the wires 16 are laid parallel in all of the strands 15.
- each of the strand assemblies 12 the three strands 15 are disposed in a triangular cross-sectional shape around the core member 14.
- the strand assemblies 12 are disposed such that the disposed cross-sectional shapes of the strands 15 are alternately reversed in direction.
- thermoplastic resin such as a polypropylene resin, a polyethylene resin, or a vinyl, etc., or synthetic resin fibers such as high-strength aramid fibers or polypropylene fibers, etc., laid together at a high density, for example, can be used for the material of the core member 14.
- An adhesive 5 is applied to at least an outer peripheral portion of each of the strands 15 to integrate them with the coating body 13. That is, the strands 15 and the coating body 13 are bonded to each other by means of the adhesive 5.
- the strand assemblies 12 are constituted by a core member 14 and three strands 15, slenderer wires 16 can be used, enabling reductions in a diameter of a sheave to which the present invention is applied.
- the strand assemblies 12 can be disposed at a high density, enabling strength to be increased while keeping the width of the rope main body 11 small, thereby enabling reductions in a width of a sheave to which the present invention is applied.
- Figure 3 is a cross section of an elevator rope according to Embodiment 3 of the present invention.
- strands 18 are used that include: a steel core wire 16 functioning as a wire; and six outer peripheral wires 17 functioning as wires disposed around the core wire 16 and laid parallel to each other. The rest of the construction is similar to that of Embodiment 2.
- the cross-sectional construction of the strands 18 is simple and stable, it is superior in the shape stability relative to external forces. Furthermore, a diameter of the outer peripheral wires 17 can be made comparatively large, enabling both flexibility and abrasion resistance to be ensured in a well-balanced manner. In addition, because only a single layer of the outer peripheral wires 17 is disposed around the core wire 16, movement among the outer peripheral wires 17 can be suppressed, enabling adhesion stability relative to the coating body 13 also to be improved. Thus, the service life of the outer peripheral wires 17 can be extended and fatigue resistance of portions bonded to the coating body 13 can be improved.
Landscapes
- Ropes Or Cables (AREA)
- Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
Description
- The present invention relates to a belt-shaped elevator rope used in an elevator to suspend a car.
-
WO 00/37 738 A1 - Various layouts for an elevator system in which a car and a counterweight are suspended by a belt-shaped rope are disclosed in Japanese Patent Publication No.
2002-504471 (Gazette - The present invention aims to solve the above problems and an object of the present invention is to provide an elevator rope capable of ensuring stable strength and enabling extension of service life.
- In order to achieve the above object, according to one aspect of the present invention, there is provided an elevator rope for suspending an elevator car, comprising a belt-shaped rope main body, wherein: the rope main body has a plurality of strands in which a plurality of wires are laid parallel; and a coating body made of a resin for covering and integrating the strands; and the strands are disposed side by side in a cross section perpendicular to a longitudinal direction of the rope main body.
- According to another aspect of the present invention, there is provided an elevator rope for suspending an elevator car, comprising a belt-shaped rope main body, wherein: the rope main body has: a plurality of strand assemblies including a core member made of a resin extending in a longitudinal direction of the rope main body, and a plurality of strands disposed around the core member and laid together with the core member; and a coating body made of a resin for covering and integrating the strand assemblies; the strands include a plurality of wires laid parallel to each other; and the strand assemblies are disposed side by side in a cross section perpendicular to a longitudinal direction of the rope main body.
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Figure 1 is a cross section of an elevator rope according to Embodiment 1 of the present invention; -
Figure 2 is a cross section of an elevator rope according toEmbodiment 2 of the present invention; -
Figure 3 is a cross section of an elevator rope according toEmbodiment 3 of the present invention; and -
Figure 4 is a cross section of an elevator rope according toEmbodiment 4 of the present invention. - Preferred embodiments of the present invention will now be explained with reference to the drawings.
-
Figure 1 is a cross section of an elevator rope according to Embodiment 1 of the present invention. In the figure, a belt-shaped rope main body 1 has: sevenstrands 2; and acoating body 3 made of a resin for covering and integrating thestrands 2. Each of thestrands 2 has a plurality ofsteel wires 4. Thewires 4 are laid parallel to each other (See Japanese Industrial Standards (JIS) G 3525 12.2 b). All of thewires 4 are laid parallel in all of thestrands 2. Thestrands 2 are disposed side by side in a cross section perpendicular to a longitudinal direction of the rope main body 1 (Figure 1 ). Specifically, the sevenstrands 2 are disposed so as to line up in a straight line at a distance from each other in a width direction of the rope main body 1 (left-to-right inFigure 1 ) in the cross section perpendicular to the longitudinal direction of the rope main body 1. - It is preferable for a diameter of the
wires 4 to be made approximately 1/400 of a diameter of a sheave (not shown) around which the rope main body 1 is wound. In this manner, bending stresses generated by the sheave are reduced, enabling fatigue resistance to be improved. Furthermore, in order to avoid making the diameter of thewires 4 considerably slenderer, it is preferable for the cross-sectional construction of thestrands 2 to be a Warrington type rather than a Seale type or a filler wire type as defined in JIS G 3525. - The
coating body 3 is composed of a thermoplastic ether-based polyurethane resin, for example. Anadhesive 5 is applied to at least an outer peripheral portion of each of thestrands 2 to integrate thestrands 2 with thecoating body 3. That is, thestrands 2 and thecoating body 3 are bonded to each other by means of the adhesive 5. Timing of the application of theadhesive 5 may be either before or after the laying together of thewires 4. - In an elevator rope of this kind, because the
strands 2 are disposed side by side and are covered by thecoating body 3 made of a resin, movement of thestrands 2 can be prevented and the occurrence of friction between thestrands 2 can be prevented, thereby enabling stable strength to be ensured and also enabling extension of service life. - Because the
wires 4 constituting each of thestrands 2 are laid parallel to each other, thewires 4 are in line contact with each other and restrain each other. Consequently, contact pressure among thewires 4 is reduced, making internal friction less likely to occur in thestrands 2, thereby also enabling stable strength to be ensured and also enabling extension of service life. - Particularly in Embodiment 1, because all of the
wires 4 in all of thestrands 2 are laid parallel, uniform strength can be ensured across the entire cross section, also making it superior in shape stability. - In addition, because
steel wires 4 and acoating body 3 made of a hard polyurethane resin are used and thestrands 2 and thecoating body 3 are bonded to each other by means of the adhesive 5, ample abrasion resistance can be ensured and stability of the belt shape and cohesion of thestrands 2 can be improved. - Now, if the overall strength of the rope main body 1 decreases and damage progresses, the
strands 2 will break in descending order of magnitude of load burden, or in descending order of severity of damage. In regard to this, even if the number ofstrands 2 is increased as a preventive measure, a strength increase proportional to the number ofstrands 2 cannot be expected since it is difficult to make the load burden on each of thestrands 2 uniform. - Furthermore, in an elevator rope integrated by a
coating body 3, it is difficult to detect to what extent a givenwire 4 inside thecoating body 3 is damaged. In other words, it is conceivable that the replacement period for the rope main body 1 cannot be determined until damage sufficient to deform an external surface of thecoating body 3 occurs in thestrands 2, or at least one of thestrands 2 is broken completely. - In regard to this, it is necessary to use five or
more strands 2 in order to ensure a residual strength of approximately 80 percent (80%) in the rope main body 1 at the point in time when it is to be replaced due to the expiration of its service life. However, if strength has degraded to the extent that one of thestrands 2 breaks, it can be surmised that damage to theother strands 2 will also have progressed and their strength degraded. Normally, the residual strength at the point in time when JIS replacement criteria are reached is in the order of a 5 percent (5%) reduction from a standard value since a safety margin from a standard breaking load is provided. - A preferred number of
strands 2 can be found from the above. Specifically, if we let a be a predetermined residual strength, b be the normal residual strength under the replacement criteria, N be the number ofstrands 2, and P be the breaking load of thestrands 2, then an expression a x P x N = b x P (N -1) is satisfied. If we assume that a is 80 percent (80%), and b is 95 percent (95%), then 0.8 x P x N = 0.95P(N - 1), and N is found to be 6.3, that is, approximately seven (7). Consequently, sufficient residual strength can be ensured if at least sevenstrands 2 are used. - Moreover, the material of the
coating body 3 is not limited to a thermoplastic ether-based polyurethane resin, and appropriate selection in response to service conditions is possible. However, if used in a high-temperature, high-humidity environment, a hard ether-based polyurethane, in which hydrolysis is less likely to occur, is preferable to an ester-based polyurethane, in which hydrolysis occurs easily. - Next,
Figure 2 is a cross section of an elevator rope according toEmbodiment 2 of the present invention. In the figure, a belt-shaped ropemain body 11 has: sevenstrand assemblies 12; and acoating body 13 made of a resin for covering and integrating thestrand assemblies 12. Thestrand assemblies 12 are disposed side by side in a cross section perpendicular to a longitudinal direction of the ropemain body 11. Specifically, the sevenstrand assemblies 12 are disposed so as to line up in a straight line at a distance from each other in a width direction of the ropemain body 11 in a cross section perpendicular to the longitudinal direction of the ropemain body 11. - Each of the
strand assemblies 12 respectively includes: acore member 14 made of a resin extending in a longitudinal direction of the ropemain body 11; and threestrands 15 disposed around thecore member 14 and laid together with thecore member 14. Each of thestrands 15 has a plurality ofsteel wires 16. Thewires 16 are laid parallel to each other. All of thewires 16 are laid parallel in all of thestrands 15. - In each of the strand assemblies 12, the three
strands 15 are disposed in a triangular cross-sectional shape around thecore member 14. Thestrand assemblies 12 are disposed such that the disposed cross-sectional shapes of thestrands 15 are alternately reversed in direction. - A thermoplastic resin such as a polypropylene resin, a polyethylene resin, or a vinyl, etc., or synthetic resin fibers such as high-strength aramid fibers or polypropylene fibers, etc., laid together at a high density, for example, can be used for the material of the
core member 14. - An
adhesive 5 is applied to at least an outer peripheral portion of each of thestrands 15 to integrate them with thecoating body 13. That is, thestrands 15 and thecoating body 13 are bonded to each other by means of the adhesive 5. - In an elevator rope of this kind, because the
strand assemblies 12 are disposed side by side and are covered by thecoating body 13 made of a resin, movement of thestrand assemblies 12 can be prevented and the occurrence of friction between thestrand assemblies 12 can be prevented, thereby enabling stable strength to be ensured and also enabling extension of service life. - Because the
wires 16 constituting each of thestrands 15 are laid parallel to each other, internal friction is less likely to occur in thestrands 15, thereby also enabling stable strength to be ensured and also enabling extension of service life. - In addition, because the
strand assemblies 12 are constituted by acore member 14 and threestrands 15,slenderer wires 16 can be used, enabling reductions in a diameter of a sheave to which the present invention is applied. - Furthermore, because three
strands 15 are disposed in a triangular cross-sectional shape around thecore member 14, and thestrand assemblies 12 are disposed such that the disposed cross-sectional shapes of thestrands 15 are alternately reversed in direction, thestrand assemblies 12 can be disposed at a high density, enabling strength to be increased while keeping the width of the ropemain body 11 small, thereby enabling reductions in a width of a sheave to which the present invention is applied. - Next,
Figure 3 is a cross section of an elevator rope according toEmbodiment 3 of the present invention. In this example,strands 18 are used that include: asteel core wire 16 functioning as a wire; and six outerperipheral wires 17 functioning as wires disposed around thecore wire 16 and laid parallel to each other. The rest of the construction is similar to that ofEmbodiment 2. - In an elevator rope of this kind, since the cross-sectional construction of the
strands 18 is simple and stable, it is superior in the shape stability relative to external forces. Furthermore, a diameter of the outerperipheral wires 17 can be made comparatively large, enabling both flexibility and abrasion resistance to be ensured in a well-balanced manner. In addition, because only a single layer of the outerperipheral wires 17 is disposed around thecore wire 16, movement among the outerperipheral wires 17 can be suppressed, enabling adhesion stability relative to thecoating body 13 also to be improved. Thus, the service life of the outerperipheral wires 17 can be extended and fatigue resistance of portions bonded to thecoating body 13 can be improved.
Claims (9)
- An elevator rope for suspending an elevator car, comprising a belt-shaped rope main body (1),
wherein:said rope main body (1) has a plurality of strands (2) in which a plurality of wires (4) are laid parallel; and a coating body (3) made of a resin for covering and integrating said strands (2); andsaid strands (2) are disposed side by side in a cross section perpendicular to a longitudinal direction of said rope main body (1),characterized in thatsaid strands (2) and said coating body (3) are bonded to each other by means of an adhesive (5). - The elevator rope according to Claim 1, characterized in that all of said wires (4) in all of said strands (2) are laid parallel.
- The elevator rope according to Claim 1, characterized in that said wires (4) are made of a steel and said coating body (3) is made of a thermoplastic ether-based polyurethane resin.
- The elevator rope according to Claim 1, characterized in that seven of said strands (2) are disposed so as to line up in a straight line at a distance from each other in said cross section perpendicular to said longitudinal direction of said rope main body (1).
- An elevator rope for suspending an elevator car, comprising a belt-shaped rope main body (11),
wherein:said rope main body (11) has:a plurality of strand assemblies (12) including a core member (14) made of a resin extending in a longitudinal direction of said rope main body (11), and a plurality of strands (15) disposed around said core member (14) and laid together with said core member (14); anda coating body (13, 21) made of a resin for covering and integrating said strand assemblies (12);said strands (15) include a plurality of wires laid parallel to each other; andsaid strand assemblies (12) are disposed side by side in a cross section perpendicular to a longitudinal direction of said rope main body (11),characterized in thatsaid strands (15) and said coating body (13, 21) are bonded to each other by means of an adhesive (5). - The elevator rope according to Claim 5, characterized in that said core member (14) is made of a polyethylene resin.
- The elevator rope according to Claim 5, characterized in that said core member (14) is made of a synthetic resin fiber.
- The elevator rope according to Claim 5, characterized in that:each of said strand assemblies (12) has one of said core member (14) and three of said strands (15) disposed around said core member (14) in a triangular cross-sectional shape; andsaid strand assemblies (12) are disposed such that said disposed cross-sectional shapes of said strands (15) are alternately reversed in direction.
- The elevator rope according to Claim 5, characterized in that each of said strands (15) includes a steel core wire (16) functioning as one of said wires; and six outer peripheral wires (17) functioning as said wires disposed around said core wire (16).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2002/011108 WO2004037702A1 (en) | 2002-10-25 | 2002-10-25 | Rope for elevator |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1555233A1 EP1555233A1 (en) | 2005-07-20 |
EP1555233A4 EP1555233A4 (en) | 2011-05-11 |
EP1555233B1 true EP1555233B1 (en) | 2018-06-06 |
Family
ID=32170786
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02777961.0A Expired - Lifetime EP1555233B1 (en) | 2002-10-25 | 2002-10-25 | Rope for elevator |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1555233B1 (en) |
JP (1) | JP4292151B2 (en) |
KR (1) | KR100680926B1 (en) |
CN (1) | CN1289378C (en) |
WO (1) | WO2004037702A1 (en) |
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CN101343841B (en) * | 2007-07-09 | 2012-09-05 | 上海三菱电梯有限公司 | Stretching component of elevator and elevator device |
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CN102264623B (en) * | 2008-12-22 | 2013-09-04 | 因温特奥股份公司 | Elevator support means, manufacturing method for said support means and elevator system comprising said elevator support means |
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KR101664935B1 (en) * | 2011-03-21 | 2016-10-11 | 오티스 엘리베이터 컴파니 | Elevator tension member |
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2002
- 2002-10-25 EP EP02777961.0A patent/EP1555233B1/en not_active Expired - Lifetime
- 2002-10-25 WO PCT/JP2002/011108 patent/WO2004037702A1/en active Application Filing
- 2002-10-25 KR KR1020047008421A patent/KR100680926B1/en active IP Right Grant
- 2002-10-25 JP JP2004525630A patent/JP4292151B2/en not_active Expired - Fee Related
- 2002-10-25 CN CNB028189418A patent/CN1289378C/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
JP4292151B2 (en) | 2009-07-08 |
EP1555233A4 (en) | 2011-05-11 |
WO2004037702A1 (en) | 2004-05-06 |
KR100680926B1 (en) | 2007-02-08 |
WO2004037702A9 (en) | 2004-12-02 |
EP1555233A1 (en) | 2005-07-20 |
CN1558865A (en) | 2004-12-29 |
CN1289378C (en) | 2006-12-13 |
KR20040068177A (en) | 2004-07-30 |
JPWO2004037702A1 (en) | 2006-02-23 |
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