JPS6068030A - Dust removing apparatus - Google Patents
Dust removing apparatusInfo
- Publication number
- JPS6068030A JPS6068030A JP17415183A JP17415183A JPS6068030A JP S6068030 A JPS6068030 A JP S6068030A JP 17415183 A JP17415183 A JP 17415183A JP 17415183 A JP17415183 A JP 17415183A JP S6068030 A JPS6068030 A JP S6068030A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- expansion
- dust
- vessel body
- porous
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Filtering Materials (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
Description
【発明の詳細な説明】
用する、高温の含塵ガスの処理に好適な除塵装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dust removal device suitable for processing high-temperature dust-containing gas.
含塵ガスから粉塵を除去する装置として従来より各種の
ものが実用に供されている。しかし高温の含塵ガスから
その温度を低下することなく、高い除塵効率で粉塵を除
去することは困難であった。例えばバグフィルタでは含
塵ガス温度は約２５０℃以下でなければならず、電気集
塵機では同じく約５５０℃以下でないと適用できず、ま
だサイクロンは比較的高温の含塵ガスにも適用できるも
のの、かなシ粒径の大きい粉塵しか除塵できず、除塵効
率も約９０％にとどまる。BACKGROUND ART Various devices have been put into practical use as devices for removing dust from dust-containing gas. However, it has been difficult to remove dust from high-temperature dust-containing gas with high dust removal efficiency without lowering the temperature. For example, bag filters require the dust-containing gas temperature to be below 250℃, and electrostatic precipitators cannot be used unless the dust-containing gas temperature is approximately 550℃ or below, and although cyclones can still be applied to relatively high-temperature dust-containing gases, Only dust with large particle size can be removed, and the dust removal efficiency is only about 90%.
一方、セラミックス多孔質管によシ含塵ガスを濾過して
清浄ガスを得ることは従来よシ知られ、かつ、実用に供
されている。またセラミックス多孔質管が耐熱耐食性に
簑れていることもよく知られている。そこで電気炉、転
炉などの工業設備から排出される多量の高温含塵ガスを
こうしたセラミックス多孔質管を利用して連続的に除塵
する工業規模の装置として、立設されたセラミックス多
孔質管と、肢管の端部をシール材を介して支持する管板
と、肢管および該管板を収容するとともに含塵ガス入口
および清浄ガス出口を設けである缶体とを備える除塵装
置が提案される。On the other hand, obtaining clean gas by filtering dust-containing gas through a porous ceramic tube is well known and has been put to practical use. It is also well known that ceramic porous tubes have excellent heat and corrosion resistance. Therefore, as an industrial-scale device that uses ceramic porous tubes to continuously remove dust from large amounts of high-temperature dust-containing gas discharged from industrial equipment such as electric furnaces and converters, we have installed ceramic porous tubes installed vertically. proposed a dust removal device that includes a tube plate that supports the end of a limb canal via a sealing material, and a can body that houses the limb tube and the tube plate and is provided with a dust-containing gas inlet and a clean gas outlet. Ru.
セラミックス多孔質管を用いたかかる除塵装置において
は、缶体としては強度的な要請などから鋼材その他の金
属材が使用されることが多く、シたがってその熱膨張率
は大きく、一方、セラミックス多孔質管は一般に熱膨張
率は小さい。しだがってとの除塵装置を高温の含塵ガス
に適用すると熱膨張差が生じ、これに起因して、多孔質
管を支持すべき管板の上下方向の位置が多孔質管の所定
の支持位置からずれてしまい、所望のシールができなく
なったシ、多孔質管の破損や脱落を招いたり、装置各所
に亀裂や損傷を与えるなどの問題が発生する。In such dust removal devices using porous ceramic tubes, steel or other metal materials are often used for the can body due to strength requirements, and therefore the coefficient of thermal expansion is large. Quality tubes generally have a small coefficient of thermal expansion. Therefore, when a dust removal device is applied to a high-temperature dust-containing gas, a difference in thermal expansion occurs, which causes the vertical position of the tube sheet that supports the porous tube to change to a predetermined position of the porous tube. This may cause problems such as displacement from the supporting position, failure to achieve the desired seal, damage to the porous tube or fall-off, and cracking or damage to various parts of the device.
本発明の目的は、高温の含塵ガスに適用しうるセラミッ
クス多孔質管を用いた除頭装置において、セラミックス
多孔質管と缶体との熱膨張率の相違による伸縮差を緩和
され、これに基づく不都合を解消できる除塵装置を提供
することにある。壕だ本発明の他の目的は以下の説明か
ら明らかとなろう。An object of the present invention is to alleviate the expansion/contraction difference due to the difference in coefficient of thermal expansion between the porous ceramic tube and the can body in a decapitation device using a porous ceramic tube that can be applied to high-temperature dust-containing gas. An object of the present invention is to provide a dust removal device that can eliminate the inconveniences caused by the above problems. Other objects of the invention will become apparent from the description below.
本発明は、電設されたセラミックス多孔質管と、肢管の
端部をシール材を介して支持する管板と、肢管および該
管板を収容するとともに含塵ガス入口および清浄ガス出
口を設けである缶体とを備える除塵装置において、該管
板に固接され該缶体外に延伸する部材を該缶体外にて相
互に固定するとともに、該管板間の該缶体には膨張しろ
を設けであることを特徴とする除塵装置である。The present invention provides an electrically installed ceramic porous tube, a tube sheet that supports the end of the limb tube through a sealing material, and a tube sheet that accommodates the limb tube and the tube sheet and is provided with a dust-containing gas inlet and a clean gas outlet. In a dust removal device comprising a can body, members fixed to the tube sheet and extending outside the can body are fixed to each other outside the can body, and an expansion allowance is provided in the can body between the tube sheets. This is a dust removal device characterized by:
以下、本発明の除塵装置を実施例の図面に基づいて詳述
する。EMBODIMENT OF THE INVENTION Hereinafter, the dust removal apparatus of this invention will be explained in detail based on the drawing of an Example.
第１図および第２図に示すように、との除塵装置は缶体
１内に複数のセラミックス製の多孔質管２を収容して構
成されている。図示の例では缶体１は円筒状であるが、
これに限定されず、例えば角筒状でもよい。また多孔質
管２も円筒状であり、製作が容易であるが、これに限定
されず、例えば角筒状でもよい。多孔質管２はセラミッ
クス粉末を成形・焼結して製作される。As shown in FIGS. 1 and 2, the dust removal device is constructed by housing a plurality of ceramic porous tubes 2 in a can body 1. As shown in FIGS. In the illustrated example, the can body 1 is cylindrical, but
The shape is not limited to this, and may be, for example, in the shape of a rectangular tube. Further, the porous tube 2 is also cylindrical and easy to manufacture, but is not limited to this, and may have a rectangular tube shape, for example. The porous tube 2 is manufactured by molding and sintering ceramic powder.
セラミックスの材質としては耐熱衝撃性に憂れたムライ
ト質、コージライト質、炭化ケイ素質、窒化ケイ素質な
どが望ましい。多孔質管２の長さは一般に長い方が望ま
しいが、成形・焼結時の歩留り向上、変形防止および使
用時の強度などを勘案して概ね０．５〜２ｍとされる。Desirable ceramic materials include mullite, cordierite, silicon carbide, and silicon nitride, which have poor thermal shock resistance. Although it is generally desirable for the length of the porous tube 2 to be long, it is set to approximately 0.5 to 2 m in consideration of improved yield during molding and sintering, prevention of deformation, and strength during use.
多孔質管２は複数個（実施例では３個）を直列に接続さ
れて長管を形成し、この長管の複数列（実施例では２１
列）が缶体１内に並列に立設されている。この長管群は
その上下両端部と接続部で、す々わち各多孔質管２の端
部において、シール材４を介して管板３に支持されてい
る。管板３はその周縁部が缶体１に固接され、多孔管２
が挿入されるべき孔が所要数穿設されている。A plurality of porous tubes 2 (three in the example) are connected in series to form a long tube, and a plurality of rows of the long tubes (21 in the example)
rows) are arranged in parallel in the can body 1. This group of long tubes is supported by the tube plate 3 via the sealing material 4 at both its upper and lower ends and at the connection portion, that is, at the end of each porous tube 2 . The tube plate 3 has its peripheral edge firmly attached to the can body 1, and the perforated tube 2
The required number of holes are drilled into which the holes are to be inserted.
多孔質管２の管板３による支持部であるＡ部、Ｂ部をそ
れぞれ第３図、第４図に拡大して示す。Parts A and B, which are the parts where the porous tube 2 is supported by the tube plate 3, are shown enlarged in FIGS. 3 and 4, respectively.
第５図は多孔質管２の接続部を示すものであり、熱損失
防止と管板保護のために断熱材層５を両側に設けられた
管板３には内部に冷却様通路６が設けられ、図示せぬ冷
却様出入口から冷却様が循環され、管板３およびシール
材４を熱的に保護している。管板３の孔の大きさは多孔
質管２が遊挿可能な大きさとされ、多孔質管２と管板３
の間にシール材４が挿入されて、多孔質管２が管板３に
支持されているとともに、多孔質管２の接続部がシール
され、かつ管板３の上側と下側ともシールされる。シー
ル材４は気体の通過を阻止する必要はなく、粉塵の通過
を実質的に阻止するものであればよい。また高温ガスに
対する耐熱性を有することが重重しく、セラミックスフ
ァイバロープ、カーボンファイバブラントハラキン、ス
テンレス鋼などのメタルファイバロープなどが採用され
る。長管の上端部の支持要領もこれとほぼ同様である。FIG. 5 shows the connection part of the porous tube 2. A cooling passage 6 is provided inside the tube sheet 3, which is provided with a heat insulating material layer 5 on both sides to prevent heat loss and protect the tube sheet. Cooling air is circulated through a cooling air outlet (not shown) to thermally protect the tube sheet 3 and sealing material 4. The size of the hole in the tube sheet 3 is large enough to allow the porous tube 2 to be inserted loosely, and the porous tube 2 and the tube sheet 3 are
A sealing material 4 is inserted between the two, and the porous tube 2 is supported by the tube sheet 3, and the connecting portion of the porous tube 2 is sealed, and the upper and lower sides of the tube sheet 3 are also sealed. . The sealing material 4 does not need to block the passage of gas, and may be any material that substantially blocks the passage of dust. In addition, it is important to have heat resistance against high-temperature gases, so ceramic fiber ropes, carbon fiber blunt Harakin ropes, and metal fiber ropes such as stainless steel are used. The method of supporting the upper end of the long pipe is almost the same.
長管の下端部を示す第４図においても、管板３の孔の内
周面に長管の下端を支持する環状リブ１１を形成しであ
る他はほぼ同様である。4, which shows the lower end of the long tube, is almost the same except that an annular rib 11 supporting the lower end of the long tube is formed on the inner circumferential surface of the hole in the tube plate 3.
最上段の管板３の上方の缶体１の部分には含塵ガス人口
１２が取付けてあり、最下段の管板３の下方の缶体１の
部分はホッパ１３を形成し、ホッパ１５の下部には粉塵
排出口１４が取付けてあり、必要に応じてホッパ１３の
側部には含跋ガス抽出口１５が設けられる。また図示し
てないが、最上段の管板３と最下段の管板３との間の缶
体１には清浄ガス出口が設けられている。A part of the can body 1 above the top tube sheet 3 is equipped with a dust-containing gas port 12, and a part of the can body 1 below the bottom tube sheet 3 forms a hopper 13, and a hopper 15 A dust discharge port 14 is installed at the bottom, and a sludge-containing gas extraction port 15 is provided at the side of the hopper 13 as required. Although not shown, a clean gas outlet is provided in the can body 1 between the uppermost tube sheet 3 and the lowermost tube sheet 3.
中間の管板に連通孔が設けられているときは清浄ガス出
口ざは少くとも一つあればよく、各管板に連通孔が設け
られてないときは隣シあう管板との間の缶体１にそれぞ
れ清浄ガス出口が設けられる。また缶体１の内面にも必
要に応じて断熱材層５が形成されて熱損失防止などが図
られる。If a communicating hole is provided in the intermediate tube sheet, there should be at least one clean gas outlet zone, and if each tube sheet is not provided with a communicating hole, there should be at least one clean gas outlet zone between the adjacent tube sheets. Each body 1 is provided with a clean gas outlet. A heat insulating material layer 5 is also formed on the inner surface of the can body 1 as required to prevent heat loss.
高温含塵ガスが含塵ガス人口１２よりこの除塵装置に導
入されると、含塵ガスは各長管内に入り、長管を構成す
る通気性を有する多孔質管２によシ濾過されて、清浄ガ
スは多孔質管２の壁を通過して清浄ガス出口にとシださ
れる。一方、含塵ガスから分離された粉塵は相互に凝集
しながらその重量によシ、また含塵ガスの運動エネルギ
によυ主として多孔質管２の内壁に沿いながら下降し、
ホッパ１５にたまる。なお、粉塵排出口１４は常時は閉
じられており、間欠的に開かれて粉塵が排出される。ま
た、必要に応じ、分離された粉塵、特に長管下部におけ
る粉塵に下向の運動エネルギを付与するために、含塵ガ
ス抽出口１５から供給ガスの一部を抽出してもよい。When high-temperature dust-containing gas is introduced into this dust removing device from the dust-containing gas port 12, the dust-containing gas enters each long pipe, is filtered by the porous pipe 2 having air permeability that constitutes the long pipe, and The clean gas passes through the wall of the porous tube 2 and is discharged to the clean gas outlet. On the other hand, the dust separated from the dust-containing gas coagulates with each other and descends mainly along the inner wall of the porous tube 2 due to its weight and due to the kinetic energy of the dust-containing gas.
Collects in hopper 15. Note that the dust outlet 14 is normally closed and is opened intermittently to discharge dust. Further, if necessary, a part of the supply gas may be extracted from the dust-containing gas extraction port 15 in order to impart downward kinetic energy to the separated dust, particularly the dust at the lower part of the long pipe.
多孔質管２はシール材４を介して管板３に支持されてい
るので振動が緩和され、多孔質管２が破損される恐れが
少ない。また水平方向の管板３と多孔質管２との熱膨張
差はシール材４によって吸収される。しかし管板３の上
下方向の位置は長管の上下両端部および接続部になけれ
ば々らない。すなわち管板の上下方向の位置がかかる部
位からはずれると、多孔質管２が管板６やその断熱材層
５と直接に接触して多孔質管などが損傷し、あるいは粉
塵をシールすることができなくなり、あるいはシール材
などが脱落するなどの不都合が生じる。特に高温の含塵
ガスを処理するとき、管板３を支持する缶体１またはそ
の断熱材層５は一般に熱膨張率が大きく、一方、多孔質
管２はセラミックス、特には耐熱衝撃性にすぐれたセラ
ミックスで形成されているので熱膨張率が小さく、高温
下においてその熱膨張差は大きくなって上述のような不
都合の発生を招きかねない。Since the porous tube 2 is supported by the tube plate 3 via the sealing material 4, vibrations are alleviated and there is little possibility that the porous tube 2 will be damaged. Further, the difference in thermal expansion between the tube plate 3 and the porous tube 2 in the horizontal direction is absorbed by the sealing material 4. However, the vertical position of the tube plate 3 must be at both the upper and lower ends of the long tube and at the connecting portion. In other words, if the vertical position of the tube sheet deviates from this position, the porous tube 2 will come into direct contact with the tube sheet 6 or its heat insulating material layer 5, damaging the porous tube or preventing dust from being sealed. This may cause inconveniences such as failure or the sealing material falling off. Particularly when processing high-temperature dust-containing gas, the can body 1 that supports the tube sheet 3 or its heat insulating material layer 5 generally has a large coefficient of thermal expansion, while the porous tube 2 is made of ceramic, particularly with excellent thermal shock resistance. Since it is made of ceramic, its coefficient of thermal expansion is small, and the difference in thermal expansion becomes large at high temperatures, which may lead to the above-mentioned problems.
そこで本発明の除塵装置では管板３相互を温度などに影
響されない手段によシ保持し、その間隔を一定に保つと
ともに、これによシ逆に缶体１に損傷を与えないように
膨張しろ９を設けである。すなわち管板５には水平部材
７が固接され、この水平部材７は缶体１の外の、望まし
くは実質的に缶体１の熱影響を受けない位置まで延伸さ
れている。そしてこの位置で水平部材７は垂直部材８に
固定されている。各水平部材７の間隔は各管板３の間隔
と等しいことが望ましいが必ずしもこれに限定されない
。このように管板３に固接され、かつ、缶体１の外に延
伸する部材を缶体１の外で相互に固定しているので、こ
の部材を金属などの比較的熱膨張係数の大□きい材質で
形成しても、温度は缶体１の内部に比較して大巾に低く
、シたがって上下方向の熱膨張量は多孔質管２のそれと
実質的に等しくなり、各管板３が所定位置からずれる恐
れがなく々る。Therefore, in the dust removal device of the present invention, the tube plates 3 are held together by means that are not affected by temperature, etc., and the distance between them is kept constant, and the expansion is prevented from damaging the can body 1. 9 is provided. That is, a horizontal member 7 is fixedly attached to the tube sheet 5, and this horizontal member 7 extends outside the can body 1, preferably to a position where the can body 1 is not substantially affected by the heat. In this position, the horizontal member 7 is fixed to the vertical member 8. Although it is desirable that the interval between each horizontal member 7 be equal to the interval between each tube sheet 3, it is not necessarily limited to this. In this way, since the members that are firmly attached to the tube sheet 3 and extend outside the can body 1 are fixed to each other outside the can body 1, these members are made of metal or other material with a relatively large coefficient of thermal expansion. □Even if it is made of a thin material, the temperature is much lower than that inside the can body 1, and therefore the amount of vertical thermal expansion is substantially equal to that of the porous tube 2, and each tube sheet 3 will no longer be at risk of shifting from its predetermined position.
また図示の実施例では第５図に詳細を示すように、隣シ
あう管板３．３の間の缶体１の部分毎に、缶体１を周方
向に切断して間隔をあけ、この間隔を膨張しろ９とする
とともに、膨張しろ９の間隙を環状かまぼこ形のアダム
ソン継手などの伸縮リング１０にて連結しである。伸縮
リング１０は缶体１に設けた膨張しろ９を覆い、缶体１
の外部へのガスの流出を防止するとともに、缶体１の温
度が上昇し、膨張しろ９が狭められても、伸縮リング１
０が更に屈曲してこれに追随する。なお膨張しろ９の形
状、構成などは上記に限定されず各種の形態のものが採
用でき、同様に伸縮リング１０は他の適宜な継手で代替
してもよい。In addition, in the illustrated embodiment, as shown in detail in FIG. The gap is set to an expansion margin 9, and the gap between the expansion margins 9 is connected with an expansion ring 10 such as an annular semicylindrical Adamson joint. The expandable ring 10 covers the expansion allowance 9 provided in the can body 1 and expands the can body 1.
Even if the temperature of the can body 1 rises and the expansion margin 9 is narrowed, the expansion ring 1
0 bends further to follow this. Note that the shape and structure of the expansion margin 9 are not limited to those described above, and various forms can be adopted, and the expansion ring 10 may be replaced with other suitable joints.
女お、上記の説明においては多孔質管を接続した長管を
用いた場合について説明したが、接続部を有せずに単段
の多孔質管を用いた場合についても同様であり、本発明
に包含されるものである。In the above explanation, we have explained the case where a long pipe with porous pipes connected to it is used, but the same applies to the case where a single stage porous pipe without a connecting part is used, and the present invention It is included in
本発明の除塵装置は以上の如く構成され、且つ作動する
ので、工業的規模の高温含塵ガスよシ粉塵を除き、高温
の清浄ガスを得る装置として有効に使用することができ
る。特に除頭部材にセラミックス多孔質管を使用してい
るので、高温ガスをそのまま処理することができ熱エネ
ルギを高い効率で回収することができる。また、本発明
の装置では、缶体を鋼材等の金属材で構成しても、こう
した金属材とセラミックス多孔質管との熱膨張係数の差
による影響も緩和され、温度変化による故障、特にセラ
ミックス多孔質管の破損等の事故が防止されている。更
に耐振処理がされているので、地震、装置の振動等によ
る事故の恐れが少ない。よって、本発明の装置は産業上
の利用価値が大である。Since the dust removal apparatus of the present invention is constructed and operates as described above, it can be effectively used as an apparatus for removing dust from high-temperature dust-containing gas on an industrial scale and obtaining high-temperature clean gas. In particular, since a porous ceramic tube is used for the decapitation member, high-temperature gas can be processed as is, and thermal energy can be recovered with high efficiency. In addition, in the device of the present invention, even if the can body is made of a metal material such as steel, the influence of the difference in thermal expansion coefficient between the metal material and the ceramic porous tube is alleviated, and failures due to temperature changes, especially in the ceramic porous tube, are alleviated. Accidents such as damage to porous pipes are prevented. Furthermore, since it has been subjected to anti-vibration treatment, there is less risk of accidents due to earthquakes, equipment vibrations, etc. Therefore, the device of the present invention has great industrial utility value.
第１図及び第２図は本発明の除塵装置の実施例の要部縦
断面図及び横断面図、第３図、第４図及び第５図はそれ
ぞれ第１図におけるＡ部。
Ｂ部及び０部の拡大図である。
１・・・缶体、２・・・多孔質管、５・・・管板、４・
・・シール材、５・・・断熱材層、７・・・水平部材、
８・・・垂直部材、９・・・膨張しろ。
茅 ２ 同
茅６川1 and 2 are longitudinal sectional views and transverse sectional views of essential parts of an embodiment of the dust removal device of the present invention, and FIGS. 3, 4, and 5 are section A in FIG. 1, respectively. It is an enlarged view of part B and part 0. DESCRIPTION OF SYMBOLS 1... Can body, 2... Porous tube, 5... Tube sheet, 4...
...Sealing material, 5...Insulating material layer, 7...Horizontal member,
8... Vertical member, 9... Expand. Kaya 2 Same Kaya 6 rivers
Claims (1)
をシール材を介して支持する管板と、肢管および該管板
を収容するとともに含塵ガス入口および清浄ガス出口を
設けである缶体とを備える除塵装置において、該管板に
固接され該缶体外に延伸する部材を該缶体外にて相互に
固定するとともに、該管板間の該缶体には膨張しろを設
けてちることを特徴とする除塵装置。(1) An erected ceramic porous tube, a tube plate that supports the end of the limb canal via a sealing material, and a tube plate that accommodates the limb tube and the tube plate and is provided with a dust-containing gas inlet and a clean gas outlet. In a dust removal device comprising a can body, members fixed to the tube sheet and extending outside the can body are fixed to each other outside the can body, and an expansion allowance is provided in the can body between the tube sheets. A dust removal device characterized by being installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17415183A JPS6068030A (en) | 1983-09-22 | 1983-09-22 | Dust removing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17415183A JPS6068030A (en) | 1983-09-22 | 1983-09-22 | Dust removing apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6068030A true JPS6068030A (en) | 1985-04-18 |
| JPS6349532B2 JPS6349532B2 (en) | 1988-10-05 |
Family
ID=15973566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17415183A Granted JPS6068030A (en) | 1983-09-22 | 1983-09-22 | Dust removing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6068030A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6231914U (en) * | 1985-08-13 | 1987-02-25 | ||
| JPS6366125U (en) * | 1986-10-17 | 1988-05-02 | ||
| JPH01151821U (en) * | 1988-03-25 | 1989-10-19 |
-
1983
- 1983-09-22 JP JP17415183A patent/JPS6068030A/en active Granted
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6231914U (en) * | 1985-08-13 | 1987-02-25 | ||
| JPH0312338Y2 (en) * | 1985-08-13 | 1991-03-25 | ||
| JPS6366125U (en) * | 1986-10-17 | 1988-05-02 | ||
| JPH01151821U (en) * | 1988-03-25 | 1989-10-19 | ||
| JPH0543846Y2 (en) * | 1988-03-25 | 1993-11-05 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6349532B2 (en) | 1988-10-05 |
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