JPH0262788B2 - - Google Patents
Info
- Publication number
- JPH0262788B2 JPH0262788B2 JP57100193A JP10019382A JPH0262788B2 JP H0262788 B2 JPH0262788 B2 JP H0262788B2 JP 57100193 A JP57100193 A JP 57100193A JP 10019382 A JP10019382 A JP 10019382A JP H0262788 B2 JPH0262788 B2 JP H0262788B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- gas
- valve
- amount
- temperature
- 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
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 95
- 238000001514 detection method Methods 0.000 claims description 7
- 239000007789 gas Substances 0.000 description 45
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1051—Arrangement or mounting of control or safety devices for water heating systems for domestic hot water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/10—Control of fluid heaters characterised by the purpose of the control
- F24H15/156—Reducing the quantity of energy consumed; Increasing efficiency
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/10—Control of fluid heaters characterised by the purpose of the control
- F24H15/174—Supplying heated water with desired temperature or desired range of temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/212—Temperature of the water
- F24H15/215—Temperature of the water before heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/238—Flow rate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/305—Control of valves
- F24H15/31—Control of valves of valves having only one inlet port and one outlet port, e.g. flow rate regulating valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/355—Control of heat-generating means in heaters
- F24H15/36—Control of heat-generating means in heaters of burners
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はガス瞬間式給湯装置、特にガス量によ
り給湯温度を制御する方式（以下ガス比例方式と
いう）のガス瞬間式給湯装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a gas instantaneous hot water supply system, and particularly to a gas instantaneous hot water supply system of a type (hereinafter referred to as a gas proportional system) in which the temperature of hot water is controlled by the amount of gas.
（従来技術とその問題点）
従来、ガス比例方式の瞬間式給湯装置には、湯
沸器出口の温度を検知して、この値と、設定温度
の値を比較して信号をガス比例弁に送り、それに
よりガス比例弁がバーナーへ送るガス量を増減す
る所謂フイードバツク方式のものや、湯沸器入口
の水の温度と入口流量を検知して設定温度と設定
効率により演算した値によりガス比例弁がバーナ
ーへ送るガス量を増減する所謂フイードフオワー
ド方式のものがあり、これらは水栓が開かれ、水
流スイツチあるいは水量センサーが水の流れを検
知したなら湯沸器が作動し湯を供給するようにな
つている。(Prior art and its problems) Conventionally, gas proportional type instantaneous water heaters detect the temperature at the outlet of the water heater, compare this value with the set temperature value, and send a signal to the gas proportional valve. There are so-called feedback systems in which a gas proportional valve increases or decreases the amount of gas sent to the burner, and a gas proportional valve that detects the water temperature and inlet flow rate at the inlet of the water heater and adjusts the gas proportional to a value calculated based on the set temperature and set efficiency. There are so-called feed-forward systems in which a valve increases or decreases the amount of gas sent to the burner.In these systems, when the faucet is opened and a water flow switch or water flow sensor detects the flow of water, the water heater is activated and the water is turned on. supply.
然る処、これら従来のガス比例方式の瞬間式給
湯装置は最大能力付近では水を設定温度にするま
での時間、つまり立上り時間は熱交換器の時定数
により決定されていた。 However, in these conventional gas proportional type instantaneous water heaters, the time it takes to bring the water to the set temperature, that is, the rise time, is determined by the time constant of the heat exchanger near the maximum capacity.
ところで、一般に給湯装置では使用時配管内に
貯つた水を早く出すようにするため給湯装置の端
末水栓は最初全開状態にされることが多い。 By the way, in general, when a water heater is in use, the terminal faucet of the water heater is often left fully open at first in order to quickly release the water stored in the piping.
そのため、水栓が全開にされた状態で、設定温
度を供給するためにガス比例弁がガスバーナーへ
最大ガス量を供給しなければならないとき、第３
図に示すように設定温度T1まで湯温を上げるの
にt1という長い時間がかかつてしまい、その時間
分だけのガス量も無駄になるという欠点がある。 Therefore, when the gas proportional valve has to supply the maximum amount of gas to the gas burner in order to supply the set temperature with the faucet fully open, the third
As shown in the figure, it takes a long time t 1 to raise the water temperature to the set temperature T 1 , and the disadvantage is that the amount of gas corresponding to that time is wasted.
尚、給水管路に給湯開始後設定温度になるまで
は閉弁して給水量を絞つておき、給水温度の上昇
により開弁して給水量を増大させるバルブを設け
たガス瞬間式給湯装置が特公昭49−44464号公報
により知られているが、この公報のものは、上記
バルブの開閉を機械的に行うもので、バルブ開弁
のためには給湯管路に設けられる湯温検知室、該
湯温検知室に内装されるベローズタイプの自己伸
縮式感温作動具、感温作動具の伸縮下端部に突出
されて湯温検知室から下方へ延びるプツシヤー・
プツシヤーの下端に上端が当接するプツシユロツ
ド、中央支点をプツシユロツドの下端に当接させ
るシーソー腕等の機械的要素を必要とし、そのた
め給湯機の大型を来たし、またその構造も複雑と
なる。 In addition, there is a gas instantaneous water heater equipped with a valve in the water supply pipe that is closed until the set temperature is reached after hot water supply starts, and then opens to increase the amount of water supplied when the water temperature rises. This is known from Japanese Patent Publication No. 49-44464, and in this publication, the above-mentioned valve is opened and closed mechanically, and in order to open the valve, a hot water temperature detection chamber provided in the hot water supply pipe, A bellows-type self-extending temperature sensing actuator is installed in the hot water temperature sensing chamber, and a pusher is protruded from the telescopic lower end of the temperature sensing actuator and extends downward from the hot water temperature sensing chamber.
Mechanical elements such as a push rod whose upper end abuts against the lower end of the pusher and a seesaw arm whose central fulcrum abuts against the lower end of the push rod are required, resulting in a large water heater and a complicated structure.
本発明は上記欠点を解消し、設定温度までの湯
温の立上がりを早め、ガスの消費量を少なくする
ことができるコンパクトで構造簡単なガス比例式
のガス瞬間式給湯装置を提供することを目的とす
る。 It is an object of the present invention to provide a compact and simple-structured gas proportional gas instantaneous water heater that eliminates the above-mentioned drawbacks, accelerates the rise of water temperature to a set temperature, and reduces gas consumption. shall be.
（問題点を解決するための手段）
上記問題点を解決するために、本発明は、ガス
量により給湯温度を制御するガス瞬間式給湯機に
おいて、給水管路又は給湯管路中に介設され水が
流れ始めたという電気的信号を受けることにより
数秒間管路を絞るバルブと、給水管路に介設した
水量センサーと、水量センサーの検出信号発生に
より上記バルブに対して電気的信号を発生すると
ともにガス比例弁に最大能力のガス量を出す開度
信号を発生するコントロールボツクスとを具備す
ることを特徴とするものである。(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a gas instantaneous water heater that controls the hot water temperature by the amount of gas. A valve that throttles the pipe for a few seconds upon receiving an electrical signal indicating that water has started flowing, a water flow sensor installed in the water supply pipe, and an electrical signal generated by the water flow sensor to the valve. The present invention is characterized in that it is further equipped with a control box that generates an opening signal to the gas proportional valve to produce the maximum amount of gas.
（作用）
管路末端の水栓が開かれて給水管路に水が流れ
始めると、水量センサーが水の流れを検知してそ
の検出信号をコントロールボツクスへ送り、更に
そのコントロールボツクスはバルブに対して水が
流れ始めたことを知らせる電気的信号を送るとと
もにガス比例弁に対して最大能力のガス量を出す
開度信号を送る。そして、コントロールボツクス
からの電気的信号を受けたバルブは数秒間管路を
絞つて流水量を制限し、したがつて作動開始の数
秒間、最大能力のガス量で少ない流量の水の温度
を短時間で上昇させる。(Function) When the faucet at the end of the pipe is opened and water begins to flow into the water supply pipe, the water flow sensor detects the flow of water and sends a detection signal to the control box, which then sends a signal to the valve. It sends an electrical signal to notify that water has started flowing, and also sends an opening signal to the gas proportional valve to produce the maximum amount of gas. Then, the valve receives an electrical signal from the control box and throttles the pipe for a few seconds to limit the amount of water flowing. Therefore, for the first few seconds of operation, the temperature of the water at the small flow rate is reduced using the maximum capacity gas flow. Increase with time.
（実施例）
以下、本発明の一実施例を図に基づいて説明す
る。(Example) Hereinafter, an example of the present invention will be described based on the drawings.
この実施例は、フイードフオワード方式のガス
瞬間式給湯装置であり、ガス配管１と連絡して本
体ケーシング２内のバーナー３に燃料ガスを供給
するガス供給管４には上流側より順次元電磁弁
５、ガバナー６、ガス比例弁７が設けられてい
る。 This embodiment is a feed-forward type gas instantaneous water heater, and a gas supply pipe 4 that communicates with a gas pipe 1 and supplies fuel gas to a burner 3 in a main body casing 2 has a sequential dimension from the upstream side. A solenoid valve 5, a governor 6, and a gas proportional valve 7 are provided.
一方、水道配管等の給水源と連絡して給湯装置
の熱交換器８に水を供給し、熱交換器８から加熱
された湯を端末の水栓９に供給する給水管路１０
には、その入口１０ａに上流側より順次バルブ１
１、給水温センサー１２、水量センサー１３が設
けられている。 On the other hand, a water supply pipe 10 connects with a water supply source such as a water pipe, supplies water to the heat exchanger 8 of the water heater, and supplies heated hot water from the heat exchanger 8 to the faucet 9 at the terminal.
, valves 1 are sequentially installed at the inlet 10a from the upstream side.
1. A water supply temperature sensor 12 and a water amount sensor 13 are provided.
そして、ガス供給管４の元電磁弁５、ガス比例
弁７、給水管路１０のバルブ１１、給水温センサ
ー１２、水量センサー１３は夫々コントロールボ
ツクス１４に電気的に連絡している。 The solenoid valve 5 of the gas supply pipe 4, the gas proportional valve 7, the valve 11 of the water supply pipe 10, the water supply temperature sensor 12, and the water amount sensor 13 are electrically connected to a control box 14, respectively.
コントロールボツクス１４は、該ボツクス表面
に設けた温度設定ダイヤル１５で設定された設定
温度と、給水温センサー１２が検知し検知信号Ａ
により該コントロールボツクス１４に入力される
給水温度と、水量センサー１３が検知し検知信号
Ｂによりコントロールボツクス１４に入力される
水量とにより必要ガス量を演算して開度信号Ｃを
ガス比例弁７へ送るように構成されている。 The control box 14 receives a set temperature set by a temperature setting dial 15 provided on the surface of the box and a detection signal A detected by the water supply temperature sensor 12.
The required gas amount is calculated based on the water supply temperature input to the control box 14 and the water amount detected by the water amount sensor 13 and input to the control box 14 based on the detection signal B, and the opening signal C is sent to the gas proportional valve 7. configured to send.
上記ガス比例弁７はこの開度信号Ｃに応じてバ
ーナー３へ送るガス量を増減する。 The gas proportional valve 7 increases or decreases the amount of gas sent to the burner 3 in accordance with this opening degree signal C.
また、コントロールボツクス１４は、水量セン
サー１３が水が流れていることを検知して検知信
号Ｂを発生することにより、バルブ１１に信号Ｄ
を送るとともにガス比例弁７に最大能力のガス量
を出す開度信号Ｃを送るように構成されており、
バルブ１１は上記信号Ｄを受けて数秒間弁１１′
を閉じる。 The control box 14 also sends a signal D to the valve 11 by detecting that the water flow sensor 13 is flowing and generates a detection signal B.
It is configured to send an opening signal C to the gas proportional valve 7 at the same time as sending the gas amount to the maximum capacity.
The valve 11 receives the signal D and closes the valve 11' for several seconds.
Close.
第２図に上記バルブ１１の一例を示す。 FIG. 2 shows an example of the valve 11.
バルブ１１は水入口１６、水出口１７、および
これら両口１６，１７を連絡する水路１８中間部
に弁１１′を有している。 The valve 11 has a water inlet 16, a water outlet 17, and a valve 11' in the middle of a water channel 18 that communicates these two ports 16, 17.
弁１１′は水路１８内に設けた隔壁１９に形成
した弁座２と、これに対応する弁体２１とにより
構成されており、弁体２１はスピンドル２２に保
持されている。 The valve 11' is composed of a valve seat 2 formed on a partition wall 19 provided in the water channel 18 and a corresponding valve body 21, which is held by a spindle 22.
スピンドル２２はシール部材２３を介して進退
自在に外部へ延び、スプリング２４に付勢されて
常時弁体２１を開弁方向に保持しており、コント
ロールボツクス１４からの信号Ｄにより駆動され
て前進し、弁体２１を数秒間弁座２０に密着させ
る。 The spindle 22 extends outwardly through a seal member 23 so as to be freely forward and backward, is biased by a spring 24 and always holds the valve body 21 in the opening direction, and is driven forward by a signal D from the control box 14. , the valve body 21 is brought into close contact with the valve seat 20 for several seconds.
一方、上記隔壁１９には弁座２０の他に水路１
８の一次側と二次側を連絡する小孔２５が開設さ
れている。 On the other hand, in addition to the valve seat 20, the partition wall 19 has a water passage 1
A small hole 25 is provided to connect the primary side and the secondary side of 8.
従つて、このバルブ１１は弁１１′を閉じるこ
とにより、給水量を小孔２５を通るだけの量に制
御することができる。 Therefore, this valve 11 can control the amount of water supplied to just the amount that passes through the small hole 25 by closing the valve 11'.
而して、斯る給湯装置は、水栓９が開かれ、水
量センサー１３が水の流れを検知するとバルブ１
１は数秒間弁１１′を閉じて流入量を小孔２５を
通るだけの量に制限するから、本給湯装置は作動
を始めた時から数秒間、最大能力のガス量で、少
ない流量の水を加熱することになり、第３図に実
線で示すように、t1′という短時間で設定温度T1
まで湯温を上昇させることができる。 In such a water heater, when the faucet 9 is opened and the water flow sensor 13 detects the flow of water, the valve 1 is turned on.
1 closes the valve 11' for a few seconds to limit the inflow amount to the amount that passes through the small hole 25. Therefore, for several seconds from the time it starts operating, this water heater uses the maximum capacity gas amount and a small flow rate of water. As shown by the solid line in Figure 3, the set temperature T 1 is reached in a short time of t 1 '.
The water temperature can be raised up to.
尚、上記実施例においてはフイードフオワード
方式のガス瞬間式給湯装置について説明したが、
本発明はフイードバツク方式のガス瞬間式給湯装
置についても全く同様に実施することができる。 In addition, in the above embodiment, a feed forward type gas instantaneous water heater was explained.
The present invention can be implemented in exactly the same way with a feedback type gas instantaneous water heater.
（発明の効果）
本発明は、上記の構成であるから以下の利点を
有する。(Effects of the Invention) Since the present invention has the above configuration, it has the following advantages.
(1) 給湯温度を設定温度に上昇させる迄に要する
時間が短かいので無駄なガス量が少なくなり、
ガスの節約を計かることができる。(1) The time required to raise the hot water temperature to the set temperature is short, reducing the amount of wasted gas.
You can save gas.
(2) 設定温度の湯を素早く得ることができるので
使用勝手が良い。(2) It is easy to use because hot water at the set temperature can be obtained quickly.
(3) 給水管路又は給湯管路に設けたバルブを複雑
な機械的要素を介さずに水量センサーの検知信
号発生に基づいて電気的に制御するので、給湯
装置の機械的構造を単純かつ簡単にすることが
でき、小型化を計ることもできる。(3) The valves installed in the water supply pipe or hot water supply pipe are electrically controlled based on the detection signal generated by the water flow sensor without using complicated mechanical elements, making the mechanical structure of the water heater simple and simple. It can also be made smaller.
(4) バルブは水が流れ始めたという電気的信号を
受けて管路を絞るので、末端の水栓を一旦閉じ
て直ちに再開した場合、すなわちワンストツプ
操作をした場合でも確実にバルブが作動し、湯
温の立上がりが良い。(4) The valve throttles the pipe upon receiving an electrical signal that water has begun to flow, so even if the end faucet is closed and immediately restarted, that is, a one-stop operation, the valve will operate reliably. The water temperature rises well.
第１図は本発明の一実施例を示すガス瞬間式給
湯装置の模式図、第２図は本発明の構成要素の１
つであるバルブの一実施例を示す断面図、第３図
は湯温の立上り特性図で、本発明給湯装置の立上
り特性を実線で、従来の給湯装置の立上り特性を
鎖線で示す。
１０……給水管路、１１……バルブ、１３……
水量センサー、１４……コントロールボツクス。
Figure 1 is a schematic diagram of a gas instantaneous water heater showing one embodiment of the present invention, and Figure 2 is one of the components of the present invention.
FIG. 3 is a cross-sectional view showing one embodiment of the valve, and is a diagram showing the rise characteristics of hot water temperature, in which the rise characteristics of the water heater of the present invention are shown by a solid line, and the rise characteristics of a conventional water heater are shown by a chain line. 10...Water supply pipe, 11...Valve, 13...
Water level sensor, 14...control box.
Claims (1)
給湯機において、給水管路又は給湯管路中に介設
され水が流れ始めたという電気的信号を受けるこ
とにより数秒間管路を絞るバルブと、給水管路に
介設した水量センサーと、水量センサーの検出信
号発生により上記バルブに対して電気的信号を発
生するとともにガス比例弁に最大能力のガス量を
出す開度信号を発生するコントロールボツクスと
を具備することを特徴とするガス瞬間式給湯装
置。1. In a gas instantaneous water heater that controls the hot water temperature by the amount of gas, a valve is installed in the water supply pipe or the hot water supply pipe and throttles the pipe for several seconds upon receiving an electrical signal indicating that water has started flowing; A water flow sensor installed in the water supply pipe, and a control box that generates an electrical signal to the valve based on the detection signal of the water flow sensor, and also generates an opening signal to the gas proportional valve to produce the maximum amount of gas. A gas instantaneous water heater characterized by comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57100193A JPS58217143A (en) | 1982-06-10 | 1982-06-10 | Tap-controlled hot-water supplying device heated by town gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57100193A JPS58217143A (en) | 1982-06-10 | 1982-06-10 | Tap-controlled hot-water supplying device heated by town gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58217143A JPS58217143A (en) | 1983-12-17 |
| JPH0262788B2 true JPH0262788B2 (en) | 1990-12-26 |
Family
ID=14267462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57100193A Granted JPS58217143A (en) | 1982-06-10 | 1982-06-10 | Tap-controlled hot-water supplying device heated by town gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58217143A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62119357A (en) * | 1985-11-18 | 1987-05-30 | Sanyo Electric Co Ltd | Temperature control device of water heater |
| JPH01302063A (en) * | 1988-05-31 | 1989-12-06 | Rinnai Corp | Water quantity controller for hot water supplying apparatus |
| JPH03213952A (en) * | 1990-01-19 | 1991-09-19 | Takagi Ind Co Ltd | Controlling method for flow rate control valve while starting hot water feeding of hot water feeding device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4944464A (en) * | 1972-09-08 | 1974-04-26 |
-
1982
- 1982-06-10 JP JP57100193A patent/JPS58217143A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4944464A (en) * | 1972-09-08 | 1974-04-26 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58217143A (en) | 1983-12-17 |
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