JPS6324210B2 - - Google Patents
Info
- Publication number
- JPS6324210B2 JPS6324210B2 JP7305781A JP7305781A JPS6324210B2 JP S6324210 B2 JPS6324210 B2 JP S6324210B2 JP 7305781 A JP7305781 A JP 7305781A JP 7305781 A JP7305781 A JP 7305781A JP S6324210 B2 JPS6324210 B2 JP S6324210B2
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- vaporization
- section
- combustion
- vaporization section
- 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
Links
- 239000000446 fuel Substances 0.000 claims description 58
- 230000008016 vaporization Effects 0.000 claims description 52
- 238000009834 vaporization Methods 0.000 claims description 43
- 238000002485 combustion reaction Methods 0.000 claims description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 17
- 239000001023 inorganic pigment Substances 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 6
- 230000002829 reductive effect Effects 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims 1
- 239000000126 substance Substances 0.000 description 9
- 238000001179 sorption measurement Methods 0.000 description 7
- 238000009835 boiling Methods 0.000 description 6
- 239000003921 oil Substances 0.000 description 6
- 238000009825 accumulation Methods 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000003350 kerosene Substances 0.000 description 3
- 235000019645 odor Nutrition 0.000 description 3
- 240000008415 Lactuca sativa Species 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 235000012045 salad Nutrition 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 238000005979 thermal decomposition reaction Methods 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000010721 machine oil Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D3/00—Burners using capillary action
- F23D3/02—Wick burners
- F23D3/08—Wick burners characterised by shape, construction, or material, of wick
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Description
【発明の詳細な説明】
本発明は液体燃料用燃焼器に用いられる燃焼芯
に関するもので、その目的は燃焼芯の燃料気化部
に生成，蓄積するタール状物質による燃料気化量
の低下、及びこれに付随しておこる刺激臭や一酸
化炭素等の発生を防止し、長期間安定な燃焼を維
持し得る燃焼芯を提供することにある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustion wick used in a liquid fuel combustor, and its purpose is to reduce the amount of fuel vaporized due to tar-like substances that are generated and accumulated in the fuel vaporization part of the combustion wick, and to reduce the amount of fuel vaporized. An object of the present invention is to provide a combustion wick that can maintain stable combustion for a long period of time while preventing the generation of irritating odors, carbon monoxide, etc. that accompany combustion.
液体燃料を燃焼芯の毛細管現象によつて吸い上
げ、この燃焼芯の気化室内に露出している先端部
分、即ち燃料気化部の表面から液体燃料を気化さ
せて燃焼せしめる、いわゆる吸い上げ気化式の燃
焼器は、石油ストーブ，石油コンロ等にひろく用
いられている。この種の燃焼器では、燃料気化部
が高温でかつ酸素の介在する雰囲気に暴露されて
いるために、液体燃料の一部が酸化、重合反応等
によつてタール状物質となり、燃料気化部に蓄積
されるという現象が容易に生じていた。特に燃料
中に微量の高沸点成分が混入したり（例えば、灯
油中に機械油，軽油，サラダ油等が混入した場
合）、あるいは燃料成分の一部が変質（例えば灯
油を長期間高温、あるいは直射日光下に保存した
時に生ずる酸化物，過酸化物，樹脂等）している
場合等には、前記タール状物質の生成，蓄積は著
しく増大する。 A so-called suction vaporization type combustor sucks up liquid fuel by the capillary action of the combustion wick, and vaporizes and burns the liquid fuel from the tip of the combustion wick exposed in the vaporization chamber, that is, the surface of the fuel vaporization section. is widely used in oil stoves, oil stoves, etc. In this type of combustor, the fuel vaporization section is exposed to a high temperature and oxygen-containing atmosphere, so some of the liquid fuel becomes a tar-like substance due to oxidation, polymerization, etc. The phenomenon of accumulation easily occurred. In particular, if trace amounts of high-boiling components are mixed into the fuel (for example, when machine oil, light oil, salad oil, etc. are mixed into kerosene), or if some of the fuel components are altered (for example, when kerosene is left at high temperatures for a long period of time or exposed to direct irradiation), When the product contains oxides, peroxides, resins, etc. that are generated when stored under sunlight, the generation and accumulation of the tar-like substances increases significantly.
このタール状物質が燃料気化部に蓄積した時、
燃料気化部の表面あるいは内部の毛細管が閉塞さ
れ、燃料の吸上げや気化が阻害される。このため
燃料気化量が異常に低下し、それに伴い、発熱量
が著しく低下し、燃焼室における空燃比を崩して
臭気，ススや有毒な一酸化炭素を多発するような
不具合を生じていた。また点火時には上記タール
状物質によつて燃料気化部の速かなる温度上昇，
燃料気化量の増加が妨げられ、安定燃焼に至るに
著しく長時間を有し、その間不安定過度燃焼によ
る臭気，スス，一酸化炭素等の発生を増大せしめ
ていた。更にタール状物質が燃焼芯とこれを支持
する金属部とを固着させ、燃焼芯の機械的動作を
不可能ならしめ、燃焼芯を下げての消火操作を不
能とする様な危険な状態もあつた。 When this tar-like substance accumulates in the fuel vaporization section,
The capillary tubes on the surface or inside the fuel vaporizing section are blocked, inhibiting fuel suction and vaporization. As a result, the amount of fuel vaporized is abnormally reduced, and as a result, the amount of heat generated is significantly reduced, causing problems such as the air-fuel ratio in the combustion chamber being disrupted and the generation of odor, soot, and toxic carbon monoxide. Also, during ignition, the temperature of the fuel vaporization section increases rapidly due to the tar-like substance mentioned above.
The increase in the amount of fuel vaporized was prevented, and it took a significantly long time to reach stable combustion, during which time the generation of odors, soot, carbon monoxide, etc. due to unstable excessive combustion increased. Furthermore, there are dangerous situations in which tar-like substances adhere to the combustion wick and the metal parts that support it, making it impossible for the combustion wick to operate mechanically, making it impossible to extinguish the fire by lowering the combustion wick. Ta.
本発明はこれら従来の欠点を解消するために、
タール状物質の生成蓄積を抑制するもので、以下
本発明の一実施例を添付図面と共に説明する。 In order to eliminate these conventional drawbacks, the present invention
This invention suppresses the generation and accumulation of tar-like substances, and one embodiment of the present invention will be described below with reference to the accompanying drawings.
第１図において、１は主芯で、シリカ−アルミ
ナ系のセラミツク多孔体（シリカ：アルミナ≒
50：50，重量比）をシリカ系結合剤で結合させた
ものである。２は吸上げ芯で、ポリプロピレン布
よりなり、主芯１に連接されている。３は燃料気
化部で、燃焼器に装着したとき、燃焼室に露出さ
れる部分である。燃料気化部３全体には、無水ケ
イ酸中に無機顔料を分散させたものが、含有，吸
着されている。また燃料気化部３の上部先端より
下部にかけて、前記無機顔料の、含有，吸着量
は、順次減少している。４は縫製糸、５は接着テ
ープである。 In Figure 1, 1 is the main core, which is a silica-alumina ceramic porous material (silica: alumina ≒
50:50, weight ratio) is bonded with a silica-based binder. 2 is a wicking core made of polypropylene cloth and connected to the main core 1. 3 is a fuel vaporization section, which is exposed to the combustion chamber when installed in the combustor. The entire fuel vaporization section 3 contains and adsorbs an inorganic pigment dispersed in silicic anhydride. Furthermore, the content and adsorption amount of the inorganic pigment gradually decreases from the upper tip to the lower part of the fuel vaporization section 3. 4 is a sewing thread, and 5 is an adhesive tape.
上記構成において、液体燃料は吸上げ芯２から
主芯１へと吸上げられ、燃料気化部３表面から気
化する。ここで本発明の効果を燃料の流れととも
に、従来例と比較して詳述する。 In the above configuration, liquid fuel is sucked up from the suction wick 2 to the main wick 1 and vaporized from the surface of the fuel vaporization section 3. Here, the effects of the present invention will be explained in detail along with the flow of fuel in comparison with the conventional example.
第２図は第１の従来例で、セラミツク多孔体の
みからなる燃料気化部３、第３図は第２の従来例
で、燃料気化部３の表面に無水ケイ酸，無機顔料
からなる気化抑制層６を設けたもの、第４図は、
本発明によるところの燃料気化部３全体に、無水
ケイ酸中に無機顔料を分散させたものを、含有，
吸着させ、また燃料気化部３の上部先端より下部
にかけて、前記無機顔料の含有，吸着量を順次減
少させたものであり、おのおのその断面を示す。 Fig. 2 shows a first conventional example, in which a fuel vaporizing section 3 is made of only a ceramic porous body, and Fig. 3 shows a second conventional example, in which the surface of the fuel vaporizing section 3 is made of silicic anhydride and an inorganic pigment for suppressing vaporization. The one provided with layer 6, FIG.
The entire fuel vaporization section 3 according to the present invention contains an inorganic pigment dispersed in silicic anhydride.
The content and adsorption amount of the inorganic pigment are gradually decreased from the upper tip to the lower part of the fuel vaporization section 3, and a cross section of each is shown.
即ち、燃料Ｆ（実線矢印）は主芯１内で吸上げ
られ、燃料気化部３表面から気化する。このと
き、第１の従来例においては、第２図に示すよう
に、燃料Ｆは燃料気化部３先端より多量に気化す
る。しかし燃料中の微量の高沸点成分や、変質成
分は容易に気化しない。このため、この先端に高
沸点成分や変質成分は蓄積し、温度と酸素の影響
を受けタール状物質Ｔ（白抜き矢印）に変化し、
蓄積した。また、第２の従来例においては、第３
図に示すように燃料気化部３の表面に気化抑制層
６を設けることによつて、燃料Ｆは燃料気化部３
先端よりある程度は気化するが、気化を抑制され
ていることにより、気化量は、気化抑制層６を設
けていない場合に比べて少量であり、熱量が蓄積
されて気化部先端は温度が上昇する。このため燃
料中の微量の高沸点成分や変質成分は、この高温
となつている先端部においては、熱分解、気化さ
れやすくなる。さらに気化抑制層６として無機顔
料や無水ケイ酸は一種の酸化触媒でありその触媒
作用によつて、この熱分解作用は促進される。し
かし、まだ燃料中の微量の高沸点成分や変質成分
を完全に分解，気化させるには不十分であり、発
熱量の低下もまぬがれない。また、この気化抑制
層６も、経年変化や、着火−消火動作、空焼き繰
り返えし等によつて徐々に剥離，亀裂等が発生す
る危険性があつた。 That is, fuel F (solid arrow) is sucked up within the main core 1 and vaporized from the surface of the fuel vaporization section 3. At this time, in the first conventional example, as shown in FIG. 2, a large amount of the fuel F is vaporized from the tip of the fuel vaporizing section 3. However, trace amounts of high-boiling components and degraded components in the fuel do not easily vaporize. For this reason, high boiling point components and altered components accumulate at this tip and change into a tar-like substance T (white arrow) under the influence of temperature and oxygen.
Accumulated. Furthermore, in the second conventional example, the third
As shown in the figure, by providing the vaporization suppressing layer 6 on the surface of the fuel vaporizing section 3, the fuel F can be transferred to the fuel vaporizing section 3.
A certain amount of vaporization occurs from the tip, but because the vaporization is suppressed, the amount of vaporization is smaller than in the case where the vaporization suppression layer 6 is not provided, and the temperature at the tip of the vaporization part increases due to the accumulation of heat. . Therefore, trace amounts of high-boiling components and altered components in the fuel are easily thermally decomposed and vaporized at this high-temperature tip. Furthermore, the inorganic pigment and silicic anhydride used as the vaporization suppressing layer 6 are a kind of oxidation catalyst, and the catalytic action promotes this thermal decomposition action. However, it is still insufficient to completely decompose and vaporize minute amounts of high-boiling components and altered components in the fuel, and a decrease in calorific value is inevitable. Further, this vaporization suppressing layer 6 also had the risk of gradually peeling off, cracking, etc. due to aging, ignition/extinguishing operations, repeated dry firing, etc.
ところが、第４図に示すように、燃料気化部３
全体に、無水ケイ酸中に無機顔料を分散させたも
のを、含有，吸着させ、無機顔料の含有，吸着量
を、燃料気化部３の上部先端より下部にかけて順
次減少させることにより、無機顔料や無水ケイ酸
で、気孔径が、ある程度小さくなつている気化部
先端では、気化が抑制されるため高温となり、燃
料中の微量の高沸点成分や変質成分は熱分解され
やすくなる。また、無機顔料や無水ケイ酸は、気
化部内部全体に拡散，吸着されているため、その
触媒作用が活発になり、熱分解作用は大いに促進
される。さらに、燃料気化部３下部においては、
無機顔料や無水ケイ酸の分散，吸着量が少なくな
つているため気孔径も小さくなることもなく、そ
のため、燃料の供給が、常に十分な状態となつて
いる。これにより、燃料気化部３先端への燃料供
給不足による燃焼量の低下等の不具合は生じなく
なる。 However, as shown in FIG.
The entire structure contains and adsorbs an inorganic pigment dispersed in silicic anhydride, and the content and adsorption amount of the inorganic pigment is gradually decreased from the upper tip to the lower part of the fuel vaporization section 3. At the tip of the vaporization part, where the pore diameter is reduced to some extent due to silicic anhydride, vaporization is suppressed and the temperature reaches a high temperature, making it easy for trace amounts of high-boiling components and altered components in the fuel to be thermally decomposed. Furthermore, since the inorganic pigment and silicic anhydride are diffused and adsorbed throughout the interior of the vaporizing section, their catalytic action becomes active and the thermal decomposition action is greatly promoted. Furthermore, in the lower part of the fuel vaporization section 3,
Since the amount of dispersion and adsorption of inorganic pigments and silicic anhydride is reduced, the pore size does not become smaller, and therefore, a sufficient supply of fuel is always maintained. As a result, problems such as a decrease in combustion amount due to insufficient fuel supply to the tip of the fuel vaporizing section 3 will not occur.
ちなみに、吸上げ気化方式の石油燃焼器を用い
て燃焼させたときの結果を示すと第５図のように
なる。燃料は白灯油にサラダ油を0.1容量％混合
させたものを用い、燃焼芯は以下の３種を用い
た。 Incidentally, the results of combustion using a suction vaporization type oil combustor are shown in Figure 5. The fuel used was a mixture of white kerosene and salad oil at 0.1% by volume, and the following three types of combustion wicks were used.
１ シシリカ−アルミナ系セラミツクフアイバー
芯で末処理のもの
２ 同上のセラミツクフアイバー芯の燃料気化部
３の表面に無水ケイ酸，無機顔料からなる気化
抑制層６を設けたもの
３ 同上のセラミツクフアイバー芯の燃料気化部
３全体に無水ケイ酸50重量％含む無機顔料を燃
料気化部３の上部先端より下部にかけて含有，
吸着量を順次減少させて、平均0.2ｇ／cm3分散
させたもの
この３種を比較すると、第５図に示すように、
燃料気化部３の上部先端から下部にかけて、無水
ケイ酸，無機顔料の、含有，吸着量を順次減少さ
せたもの(3)、（・印）は末処理のもの(1)（〇印）
気化抑制層を設けたもの(2)（□印）に比べて、発
熱量の低下が著しく減少している。1. A silica-alumina ceramic fiber core with a final treatment. 2. A ceramic fiber core with a vaporization suppressing layer 6 made of silicic anhydride and an inorganic pigment provided on the surface of the fuel vaporizing portion 3 of the same ceramic fiber core as above. 3. An inorganic pigment containing 50% by weight of silicic anhydride is contained throughout the fuel vaporization section 3 from the top tip to the bottom of the fuel vaporization section 3,
Comparing these three types, the amount of adsorption was gradually decreased to an average of 0.2 g/ cm3 , as shown in Figure 5.
The content and adsorption amount of silicic anhydride and inorganic pigment are gradually decreased from the upper tip to the lower part of the fuel vaporization section 3 (3), (* mark) is the final treated one (1) (○ mark)
Compared to the case (2) (marked with a □) in which a vaporization suppression layer was provided, the decrease in calorific value was significantly reduced.
さらに、燃料気化部３に無水ケイ酸等が、分散
吸着しているため、燃料気化部３の強度が大とな
り、空焼き等による燃料気化部３の収縮等の発生
による燃焼芯の機械的動作の不可能という不具合
もなくなつた。 Furthermore, since silicic acid anhydride etc. are dispersed and adsorbed in the fuel vaporization section 3, the strength of the fuel vaporization section 3 is increased, and the mechanical movement of the combustion wick due to contraction of the fuel vaporization section 3 due to dry firing, etc. The problem of not being able to do this has also disappeared.
以上の様に本発明の燃焼芯は燃料気化部全体に
無水ケイ酸を含む無機顔料を、気化部先端から下
部にかけて、含有，吸着量を順次減少させて、分
散させることによつて、タール状物質の生成，蓄
積を抑え、長時間にわたる安定燃焼を提供し得る
もので、実用的に大きな効果を有するものであ
る。 As described above, the combustion wick of the present invention has a tar-like appearance by dispersing the inorganic pigment containing silicic anhydride throughout the fuel vaporization section by decreasing the amount of content and adsorption from the tip to the bottom of the vaporization section. It suppresses the generation and accumulation of substances and provides stable combustion over a long period of time, which has great practical effects.
第１図は本発明の一実施例にかかる燃焼芯の部
分断面図、第２図および、第３図は従来の燃焼芯
の作用説明図、第４図は本発明の一実施例にかか
る燃焼芯の作用説明図、第５図はそれらの特性図
である。
１……主芯、２……吸上げ芯、３……燃料気化
部。
FIG. 1 is a partial sectional view of a combustion wick according to an embodiment of the present invention, FIGS. 2 and 3 are explanatory diagrams of the operation of a conventional combustion wick, and FIG. 4 is a combustion wick according to an embodiment of the present invention. FIG. 5, which is an explanatory diagram of the action of the core, shows their characteristics. 1... Main core, 2... Suction wick, 3... Fuel vaporization section.
Claims (1)
毛細管現象により吸上げて先端部の燃料気化部表
面から気化させるものにおいて、燃料気化部全体
に無機顔料を無水ケイ酸とともに分散・吸着させ
たもので、燃料気化部の上部先端より下部にかけ
て、無機顔料の分散・吸着した濃度を順次減少さ
せたことを特徴とする燃焼芯。1 The main material is ceramic porous material, which sucks up liquid fuel by capillary action and vaporizes it from the surface of the fuel vaporization section at the tip.Inorganic pigments are dispersed and adsorbed together with silicic anhydride throughout the fuel vaporization section. , a combustion wick characterized in that the concentration of dispersed and adsorbed inorganic pigments is gradually reduced from the upper tip to the lower part of the fuel vaporization section.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7305781A JPS57187507A (en) | 1981-05-14 | 1981-05-14 | Combustion wick |
| US06/366,168 US4421477A (en) | 1981-04-13 | 1982-04-07 | Combustion wick |
| CA000400701A CA1196565A (en) | 1981-04-13 | 1982-04-08 | Combustion wick |
| DE8282103050T DE3264865D1 (en) | 1981-04-13 | 1982-04-08 | Combustion wick |
| EP82103050A EP0062910B1 (en) | 1981-04-13 | 1982-04-08 | Combustion wick |
| KR1019820001561A KR830010341A (en) | 1981-04-13 | 1982-04-09 | Combustion wick |
| AU82539/82A AU536532B2 (en) | 1981-04-13 | 1982-04-13 | Wick for burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7305781A JPS57187507A (en) | 1981-05-14 | 1981-05-14 | Combustion wick |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57187507A JPS57187507A (en) | 1982-11-18 |
| JPS6324210B2 true JPS6324210B2 (en) | 1988-05-19 |
Family
ID=13507342
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7305781A Granted JPS57187507A (en) | 1981-04-13 | 1981-05-14 | Combustion wick |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57187507A (en) |
-
1981
- 1981-05-14 JP JP7305781A patent/JPS57187507A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57187507A (en) | 1982-11-18 |
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