JP3256590B2 - Stone cutter plate - Google Patents
Stone cutter plateInfo
- Publication number
- JP3256590B2 JP3256590B2 JP05634293A JP5634293A JP3256590B2 JP 3256590 B2 JP3256590 B2 JP 3256590B2 JP 05634293 A JP05634293 A JP 05634293A JP 5634293 A JP5634293 A JP 5634293A JP 3256590 B2 JP3256590 B2 JP 3256590B2
- Authority
- JP
- Japan
- Prior art keywords
- cutter plate
- cutting edge
- stone
- cutting
- pitch
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
- B28D1/12—Saw-blades or saw-discs specially adapted for working stone
- B28D1/127—Straight, i.e. flat, saw blades; strap saw blades
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
- B23D61/12—Straight saw blades; Strap saw blades
- B23D61/123—Details of saw blade body
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【産業上の利用分野】本発明は、塊状を呈する大理石又
は花崗岩等の原石をスラブに薄引きする場合等に用いら
れる石材用カッタープレートに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stone cutter plate used for thinning slabs of rough stones such as marble or granite.
【０００２】[0002]
【従来の技術】大理石又は花崗岩等の原石は、重量が数
トンもある塊状であり、加工工場でスラブに加工されて
使用される。従来、これらの原石をスラブに薄引きする
には、図３に示すような、幅１００mm、厚さ４mm、長さ
４〜５ｍもある薄い鋼板からなる石材用カッタープレー
ト２１を、棒材２２に側面平行に所定間隔で多数枚並べ
て組立てたカッター１０が用いられている。この薄引き
加工は、カッター２０を原石Ｗに当接して原石とカッタ
ープレート２１の刃先面との間にグリットを供給しなが
ら所定荷重Ｐの圧力下で所定速度で矢印方向に前進後退
運動することによってなされるが、原石Ｗの厚さが通常
２ｍ前後もあるため、２４時間連続で数日から１週間以
上を要する。2. Description of the Related Art Raw stones such as marble or granite are lumps weighing several tons, and are processed into slabs at processing plants for use. Conventionally, in order to thin these rough stones into a slab, as shown in FIG. 3, a stone material cutter plate 21 made of a thin steel plate having a width of 100 mm, a thickness of 4 mm, and a length of 4 to 5 m is added to a bar 22. A cutter 10 is used in which a large number of cutters 10 are arranged side by side at predetermined intervals parallel to the side surfaces. In this thinning process, the cutter 20 is moved forward and backward in the direction of the arrow at a predetermined speed under a pressure of a predetermined load P while supplying grit between the raw stone and the cutting edge surface of the cutter plate 21 while contacting the raw stone W. However, since the thickness of the ore W is usually about 2 m, it takes several days to one week or more for 24 hours continuously.
【０００３】従来の石材用カッタープレート（以下、単
にカッタープレートという）は、熱間圧延された板厚４
mmの機械構造用炭素鋼板材（Ｓ５５Ｃ〜ＳＥＡ１０５
材）を多く用いているが、切断工程が長時間にわたるた
め波状の歪が発生し、また摩耗量も多く寿命が短く通常
１回しか使用できない。さらに切断中にカッタープレー
トの切損事故も発生し易い。そのため、従来、カッター
プレートの摩耗度を少なくして寿命を向上させ、且つ切
削ムラを解消するために、カッタープレートが降伏点９
０Kg/mm2以上の強度を有するように熱処理したもの(実
開平１−７０５１２号、実開平４−７１２１２号公
報）、カッタープレートの刃先部両面に鉄砂供給用長溝
を形成したもの（実開昭６２−９８１１３号公報）等、
種々の方策が提案されている。これらの方策は、カッタ
ープレートの強度の向上或いはグリットの均一供給によ
る切削ムラの解消に所定の効果を奏するものの、前記両
方の要求を同時に満たすには未だ十分とは言い難い。A conventional stone cutter plate (hereinafter simply referred to as a cutter plate) has a hot-rolled sheet thickness of 4 mm.
mm carbon steel sheet for machine structure (S55C-SEA105
), But the cutting process is long, resulting in wavy distortion, a large amount of abrasion, short life, and usually only one use. Further, a breakage accident of the cutter plate easily occurs during cutting. Therefore, conventionally, in order to reduce the abrasion degree of the cutter plate and improve the service life, and to eliminate the cutting unevenness, the cutter plate has a yield point of 9%.
Heat-treated so as to have a strength of 0 kg / mm 2 or more (Japanese Utility Model Laid-Open No. 1-70512 and Japanese Utility Model Laid-Open No. 4-71212), and a cutter plate in which long grooves for iron sand supply are formed on both sides of the cutting edge (real open No. 62-98113) and the like.
Various strategies have been proposed. Although these measures have a predetermined effect on improving the strength of the cutter plate or eliminating cutting unevenness due to the uniform supply of grit, they are still not enough to satisfy both of the above requirements at the same time.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、従来のカッ
タープレートの上記問題点を解消するために創案された
ものであって、波状の歪が発生せず、摩耗度が少なく、
耐用時間を大幅に延長させることができる石材用カッタ
ープレートを提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems of the conventional cutter plate, and does not generate wavy distortion, has a low degree of wear,
It is an object of the present invention to provide a stone cutter plate that can significantly extend the service life.
【０００５】[0005]
【課題を解決するための手段】上記問題点を解決する本
発明の石材用カッタープレートは、狭幅の長尺鋼板で形
成された石材用カッタープレートであって、刃先面及び
又は刃先側面に間欠的に焼入れをし、硬化部と未硬化部
が交互に存在するようにしてなることを特徴とする技術
的構成を備えている。前記硬化部は少なくとも刃先側面
に所定ピッチで斜め焼入れして形成することが望まし
く、且つそのピッチは１０mm〜４０mmの範囲、傾斜角度
が刃先面に対して４５°〜９０°の範囲であることが望
ましい。また、カッタープレートは、刃先側面が平面な
カッタープレートに限らず、刃先側面にグリッド供給用
の長溝が形成されているカッタープレートであっても良
い。A stone cutter plate according to the present invention, which solves the above-mentioned problems, is a stone cutter plate formed of a long steel plate having a narrow width. A hardened portion and an unhardened portion are alternately present. The hardened portion is desirably formed by obliquely quenching at least a predetermined pitch on the side surface of the cutting edge, and the pitch is in a range of 10 mm to 40 mm, and the inclination angle is in a range of 45 ° to 90 ° with respect to the cutting edge surface. desirable. Further, the cutter plate is not limited to a cutter plate having a flat blade edge side surface, and may be a cutter plate having a grid supply long groove formed on the blade edge side surface.
【０００６】[0006]
【作用】カッタープレートに未硬化部と硬化部が存在す
ることによって、硬化部で耐摩耗性を向上させ、未硬化
部でグリットのスリップを防止させ、切れ味を向上させ
る。特に、刃先側面に間欠的に斜め焼入れすることによ
って、未硬化部の存在による強度低下を防ぐことがで
き、またカッタープレートの長手方向の強度が向上す
る。The presence of an uncured portion and a hardened portion on the cutter plate improves the wear resistance of the hardened portion, prevents the grit from slipping at the unhardened portion, and improves the sharpness. In particular, by intermittently obliquely quenching the cutting edge side surface, it is possible to prevent the strength from being reduced due to the presence of the uncured portion, and to improve the longitudinal strength of the cutter plate.
【０００７】[0007]
【実施例】図１は本発明に係るカッタープレートの実施
例を示している。該カッタープレート１は、従来のカッ
タープレートと同様に熱間圧延された板厚４mmの機械構
造用炭素鋼板材で形成され、その両端部に組立用の棒材
が貫通する孔２が形成されている。そして、本実施例の
カッタープレートにおいては、刃先面３に間欠的に等ピ
ッチｐで高周波誘導加熱で局部焼入れをし、且つ該刃先
面３の焼入れ部に続くように両刃先側面４に同じピッチ
ｐで傾斜角度αで間欠的に斜め焼入れを施し、そして同
じく高周波誘導加熱で焼戻しを施し、刃先面３及び刃先
側面４に硬化部５と未硬化部６が交互に存在するように
熱処理をしてある。硬化部５と未硬化部６のピッチｐ
は、高周波誘導加熱コイルによる加熱のＯＮ、ＯＦＦの
間隔及びカッタープレートの送り速度を変化させること
によって自由に選択できる。また、斜め焼入の傾斜角度
αも高周波誘導加熱コイルの角度を変化させることによ
って自由に選択できる。FIG. 1 shows an embodiment of a cutter plate according to the present invention. The cutter plate 1 is formed of a hot-rolled carbon steel sheet for machine structure having a thickness of 4 mm, similarly to the conventional cutter plate, and has holes 2 formed at both ends thereof through which rods for assembly pass. I have. In the cutter plate of the present embodiment, the cutting edge surface 3 is intermittently hardened by high-frequency induction heating at an equal pitch p, and has the same pitch on both cutting edge side surfaces 4 so as to follow the hardened portion of the cutting edge surface 3. Intermittent oblique quenching is performed at an inclination angle α at p, and tempering is also performed by high frequency induction heating, and heat treatment is performed so that the hardened portions 5 and the unhardened portions 6 are alternately present on the cutting edge surface 3 and the cutting edge side surface 4. It is. Pitch p between cured part 5 and uncured part 6
Can be freely selected by changing the ON / OFF interval of heating by the high frequency induction heating coil and the feed speed of the cutter plate. Also, the inclination angle α of the oblique quenching can be freely selected by changing the angle of the high-frequency induction heating coil.
【０００８】なお、上記実施例では刃先面３と刃先側面
４の両方の面に硬化部と未硬化部を存在させているが、
必ずしも両方の面に存在させなくても、何れかの面に存
在させるだけでも可能である。しかしながら、望ましく
は刃先側面に間欠的に斜め焼入れするのが良い。以上の
ように構成されたカッタープレートを図３に示す従来の
石材用カッターと同様に組立て使用するが、その使用方
法は従来と同様であるので説明は省略する。また、本発
明は刃先側面が平面なカッタープレートに限らず、刃先
側面にグリット供給用の長溝が形成されているカッター
プレートにも適用できることは言うまでもない。図２は
その場合の実施例を示している。本実施例のカッタープ
レート１０は、刃先側面１１にグリット供給用の長溝１
３が形成され、該刃先側面１１及び刃先面１２に等ピッ
チに斜め焼入れして間欠的に硬化部１４を形成してあ
る。それにより、刃先側面に長溝１３を横切って前記実
施例と同様に硬化部１４と未硬化部１５が交互に存在し
ている。In the above embodiment, the hardened portion and the unhardened portion are present on both the cutting edge surface 3 and the cutting edge side surface 4.
It is not always necessary to exist on both surfaces, but it is also possible to simply exist on either surface. However, it is desirable to intermittently harden the cutting edge side face obliquely. The cutter plate constructed as described above is assembled and used in the same manner as the conventional stone cutter shown in FIG. In addition, it goes without saying that the present invention is not limited to a cutter plate having a flat blade edge, but can also be applied to a cutter plate having a long grit supply groove formed on the blade edge. FIG. 2 shows an embodiment in that case. The cutter plate 10 of this embodiment has a long groove 1 for supplying grit on a side surface 11 of the cutting edge.
A hardened portion 14 is formed intermittently by obliquely quenching the cutting edge side surface 11 and the cutting edge surface 12 at an equal pitch. As a result, the hardened portions 14 and the unhardened portions 15 are alternately present on the side surface of the cutting edge across the long groove 13 as in the above-described embodiment.
【０００９】次に、図１の実施例に示すような刃先側面
が平面なカッタープレートを使用して石材を切断した実
施例を示す。実施例１ カッタープレート 材 質： 機械構造用炭素鋼板材ＳＡＥ１５４１材 熱処理： 高周波誘導加熱で両刃先側面に傾斜角度４５
°、ピッチ２０mm(実施例１−１)、及び傾斜角度８０
°、ピッチ４０mm(実施例１−２)で局部的に斜め焼入れ
をし、且つ高周波誘導加熱で焼戻しを行ない、焼入れ部
硬度ＨＲＣ４８のカッタープレートを得た。上記カッタ
ープレートで、グリット及びショットの混合研削粒を使
用して切断面が３００mm×１００mmの大きさを有する白
御影石を切断した。その結果、切断後のカッタープレー
トの摩耗減量は、実施例１−１のカッタープレートは
１．４５mmであり、実施例１−２のカッタープレートは
２．００mmであった。また、切断に要した時間は、実施
例１−１が７２分であり、実施例１−２が９７分であっ
た。また、比較例として実施例１と同様な材質で形成さ
れ、全面焼入れ及び焼戻しして硬度ＨＲＣ４７のカッタ
ープレートを得、それを使用して前記実施例の場合と同
様な条件で白御影石を切断した。その結果、切断後のカ
ッタープレートの摩耗減量は、１．９５mmであった。ま
た、切断時間は１２６分であった。Next, an embodiment in which a stone material is cut using a cutter plate having a flat blade edge side as shown in the embodiment of FIG. 1 will be described. Example 1 Cutter plate Material: Carbon steel sheet material for machine structure SAE1541 Material Heat treatment: Incline angle 45 on both cutting edge sides by high frequency induction heating
°, pitch 20 mm (Example 1-1), and inclination angle 80
°, a pitch of 40 mm (Example 1-2), oblique quenching was performed locally, and tempering was performed by high-frequency induction heating to obtain a cutter plate having a quenched portion hardness of HRC48. Using the above-mentioned cutter plate, a white granite having a cut surface having a size of 300 mm x 100 mm was cut using a mixed abrasive of grit and shot. As a result, the wear loss of the cutter plate after cutting was 1.45 mm for the cutter plate of Example 1-1 and 2.00 mm for the cutter plate of Example 1-2. The time required for cutting was 72 minutes in Example 1-1, and 97 minutes in Example 1-2. Further, as a comparative example, a cutter plate having the same material as that of Example 1 and quenched and tempered to obtain a cutter plate having a hardness of HRC47 was used, and the white granite was cut using the same conditions as in the above-mentioned Example. . As a result, the abrasion loss of the cutter plate after cutting was 1.95 mm. The cutting time was 126 minutes.
【００１０】上記実施例１−１及び１−２と比較例１と
を比較した場合、実施例１−１はカッタープレートの摩
耗量及び切断時間とも比較例より一段と少ない。一方、
実施例１−２は、カッタープレートの摩耗度においては
比較例より若干高く殆ど同じであるが、切断時間におい
ては約３０分程度短縮できた。また、白御影石の切断面
の状態は、実施例１−１及び１−２のものが比較例のも
のより、切断ムラがなく平面度の高い仕上りとなってい
た。以上のことから、単にカッタープレート全面を焼入
れしたものに比べて本願発明のように、適宜ピッチで部
分的に斜め焼入れすることによって、耐摩耗度及び切断
時間においても優れた効果を発揮することが確認され
た。また、斜め焼入れのピッチによっても、カッタープ
レート特性は変化し、上記実施例では実施例１−１、即
ちピッチを２０mmにしたものが４０mmにした場合よりも
優れた特性を示し、望ましい。When comparing Examples 1-1 and 1-2 with Comparative Example 1, Example 1-1 has much less abrasion amount and cutting time of the cutter plate than Comparative Example. on the other hand,
In Example 1-2, the degree of wear of the cutter plate was slightly higher than that of the comparative example and almost the same, but the cutting time could be reduced by about 30 minutes. In addition, the condition of the cut surface of the white granite was such that the samples of Examples 1-1 and 1-2 had no cut unevenness and a higher flatness than those of the comparative example. From the above, as described in the present invention, by partially obliquely quenching at an appropriate pitch as compared to the case of simply quenching the entire cutter plate, it is possible to exhibit excellent effects also in abrasion resistance and cutting time. confirmed. In addition, the cutter plate characteristics also change depending on the pitch of the oblique quenching, and in the above embodiment, the characteristics of Example 1-1, that is, the case where the pitch is set to 20 mm are superior to the case where the pitch is set to 40 mm.
【００１１】実施例２ 材 質： Ｓ５０Ｃ材 熱処理： 高周波誘導加熱で両刃先側面に傾斜角度４５
°、ピッチ２０mm(実施例２−１)、及び傾斜角度８０
°、ピッチ４０mm(実施例２−２)で斜め焼入れをし、且
つ高周波誘導加熱で焼戻しを行ない、焼入れ部硬度ＨＲ
Ｃ４８．５のカッタープレートを得た。得られたカッタ
ープレートで、グリット及びショットの混合研削粒を使
用して実施例１と同様に切断面が３００mm×１００mmの
大きさを有する白御影石を切断した。その結果、切断後
のカッタープレートの摩耗減量は、実施例２−１のカッ
タープレートは１．１０mmであり、実施例２−２のカッ
タープレートは１．９５mmであった。また、切断に要し
た時間は、実施例２−１が１２０分であり、実施例２−
２が９５分であった。また比較例として熱間圧延された
Ｓ５０Ｃ材をそのまま使用して形成さたカッタープレー
トで前記実施例２−１及び実施例２−２と同様な条件で
同じく白御影石を切断した。その結果、比較例の場合
は、切断時間は約１１５分で実施例の場合とあまり変わ
らなかったが、摩耗減量が３．５mmと著しく多かった。 Example 2 Material: S50C material Heat treatment: High-frequency induction heating applied to both cutting edge side surfaces at an inclination angle of 45
°, pitch 20 mm (Example 2-1), and inclination angle 80
°, a pitch of 40 mm (Example 2-2), oblique quenching, and tempering by high frequency induction heating, HR hardness HR
A C48.5 cutter plate was obtained. Using the obtained cutter plate, a white granite having a cut surface having a size of 300 mm x 100 mm was cut in the same manner as in Example 1 by using mixed abrasive grains of grit and shot. As a result, the wear loss of the cutter plate after cutting was 1.10 mm for the cutter plate of Example 2-1 and 1.95 mm for the cutter plate of Example 2-2. The time required for the cutting was 120 minutes in Example 2-1 and in Example 2--1.
2 was 95 minutes. As a comparative example, a white granite was cut in the same manner as in Examples 2-1 and 2-2 with a cutter plate formed by using hot-rolled S50C material as it was. As a result, in the case of the comparative example, the cutting time was about 115 minutes, which was not much different from that of the example, but the wear loss was remarkably large at 3.5 mm.
【００１２】[0012]
【発明の効果】以上のように、本発明の石材用カッター
プレートによれば、未硬化部と硬化部が存在することに
よって、硬化部で耐摩耗性を向上させ、未硬化部でグリ
ットのスリップを防止して切れ味を向上させることがで
き、従来のカッタープレートでは達成することのできな
かった耐摩耗性と切断時間の短縮化及び切断面の平滑仕
上げの要求を同時に満たすことが可能である。特に、間
欠的に斜め焼入れすることによって、未硬化部の存在に
よる強度低下を防ぐことができ、またカッタープレート
の長手方向の強度が向上し、波状の歪の発生もなく、カ
ッタープレートの耐用時間を大幅に延長させることがで
きる。As described above, according to the stone cutter plate of the present invention, since the uncured portion and the cured portion are present, the abrasion resistance is improved at the cured portion, and the slip of the grit is improved at the uncured portion. And the sharpness can be improved, and the requirements of wear resistance, reduction of cutting time and smooth finish of cut surface, which cannot be achieved by the conventional cutter plate, can be satisfied at the same time. In particular, intermittent oblique quenching prevents the strength from being reduced due to the presence of the uncured portion, improves the strength of the cutter plate in the longitudinal direction, does not generate wavy distortion, and reduces the service life of the cutter plate. Can be greatly extended.
【図１】本発明の実施例に係る石材用カッタープレート
の斜視図である。FIG. 1 is a perspective view of a cutter plate for stone according to an embodiment of the present invention.
【図２】本発明の他の実施例に係る石材用カッタープレ
ートの斜視図である。FIG. 2 is a perspective view of a stone cutter plate according to another embodiment of the present invention.
【図３】石材を切断状況を示す従来の石材用カッターの
斜視図である。FIG. 3 is a perspective view of a conventional stone cutter showing a cutting state of the stone.
１、１０ カッタープレート ３、１２ 刃先
面 ４、１１ 刃先側面 ５、１４ 硬化
部 ６、１５ 未硬化部 １３ 長溝1, 10 Cutter plate 3, 12 Blade edge 4, 11, Blade edge 5, 14, Hardened part 6, 15 Uncured part 13 Long groove
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B28D 1/06 B24B 27/06 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) B28D 1/06 B24B 27/06
Claims (4)
タープレートであって、刃先面及び又は刃先側面に間欠
的に焼入れをし、硬化部と未硬化部が交互に存在するよ
うにしてなることを特徴とする石材用カッタープレー
ト。1. A stone cutter plate formed of a long steel plate having a narrow width, wherein a cutting edge surface and / or a cutting edge side surface is intermittently quenched so that a hardened portion and an unhardened portion alternately exist. A stone cutter plate characterized by being made of:
め焼入れして形成されたものである請求項１記載の石材
用カッタープレート。2. The stone cutter plate according to claim 1, wherein the hardened portion is formed by obliquely quenching the side surface of the cutting edge at a predetermined pitch.
求項１または２記載の石材用カッタープレート。3. The stone cutter plate according to claim 1, wherein a long groove is formed on the side surface of the cutting edge.
であり、傾斜角度が刃先面に対して４５°〜９０°であ
る請求項２または３記載の石材用カッタープレート。4. The oblique quenching pitch is 10 mm to 40 mm.
4. The stone material cutter plate according to claim 2, wherein the inclination angle is 45 ° to 90 ° with respect to the cutting edge surface. 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05634293A JP3256590B2 (en) | 1993-02-23 | 1993-02-23 | Stone cutter plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05634293A JP3256590B2 (en) | 1993-02-23 | 1993-02-23 | Stone cutter plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06246735A JPH06246735A (en) | 1994-09-06 |
| JP3256590B2 true JP3256590B2 (en) | 2002-02-12 |
Family
ID=13024559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05634293A Expired - Fee Related JP3256590B2 (en) | 1993-02-23 | 1993-02-23 | Stone cutter plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3256590B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012206248A1 (en) * | 2012-04-17 | 2013-10-17 | Robert Bosch Gmbh | Cutting tool, in particular saw blade, for a machine tool |
-
1993
- 1993-02-23 JP JP05634293A patent/JP3256590B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06246735A (en) | 1994-09-06 |
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