JPH0577945B2 - - Google Patents
Info
- Publication number
- JPH0577945B2 JPH0577945B2 JP61090874A JP9087486A JPH0577945B2 JP H0577945 B2 JPH0577945 B2 JP H0577945B2 JP 61090874 A JP61090874 A JP 61090874A JP 9087486 A JP9087486 A JP 9087486A JP H0577945 B2 JPH0577945 B2 JP H0577945B2
- Authority
- JP
- Japan
- Prior art keywords
- connecting pipe
- indoor
- stopped
- side connecting
- refrigerant
- 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
- 239000007788 liquid Substances 0.000 claims description 26
- 238000001816 cooling Methods 0.000 claims description 15
- 239000003507 refrigerant Substances 0.000 description 26
- 239000010721 machine oil Substances 0.000 description 18
- 238000010438 heat treatment Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 235000003642 hunger Nutrition 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000037351 starvation Effects 0.000 description 1
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、マルチタイプの空気調和装置に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a multi-type air conditioner.
（従来の技術）
第３図図示の如く、１台の室外ユニツト１′に
対して複数台の室内ユニツト２′……を、液側連
絡配管１３′及びガス側連絡配管１４′と複数の液
側分岐連絡配管１３a′……及びガス側分岐連絡配
管１４a′……とを介して接続して、各室内ユニツ
ト２′を個別に制御するようにしたマルチタイプ
の空気調和装置は、従来からよく知られている。
即ち、圧縮機３′、四路切換弁４′室外熱交換器
５′、暖房用膨張機構６′、レシーバ１１′および
アキユムレータ９′を備えた室外ユニツト１′に対
して、冷房用膨張機構７′および室内熱交換器
８′を備えた室内ユニツト２′を複数台接続して、
冷媒を実線矢印（冷房運転時）あるいは点線矢印
（冷房運転時）に示すように可逆的に循環せしめ
るようにしたものが知られている。このような構
造の空気調和装置においては、冷房運転時及び暖
房運転時、一方の室内ユニツト２′が運転中で、
他方の室内ユニツト２′の運転が停止されると、
該室内ユニツト２′への冷媒流通を阻止するため
に冷房用膨張機構７′と直列に接続された閉鎖用
電磁開閉弁１２′が全閉状態とされるようになつ
ている。(Prior Art) As shown in FIG. 3, one outdoor unit 1' is connected to a plurality of indoor units 2'... with a liquid-side connecting pipe 13', a gas-side connecting pipe 14', and a plurality of liquid-side connecting pipes 14'. A multi-type air conditioner in which each indoor unit 2' is controlled individually by connecting through the side branch connecting pipe 13a' and the gas side branch connecting pipe 14a' has been well known in the past. Are known.
That is, for an outdoor unit 1' that includes a compressor 3', a four-way switching valve 4', an outdoor heat exchanger 5', a heating expansion mechanism 6', a receiver 11', and an accumulator 9', a cooling expansion mechanism 7' is used. ' and an indoor unit 2' equipped with an indoor heat exchanger 8' are connected,
A system is known in which the refrigerant is reversibly circulated as shown by solid line arrows (during cooling operation) or dotted line arrows (during cooling operation). In an air conditioner having such a structure, during cooling operation and heating operation, one indoor unit 2' is in operation,
When the operation of the other indoor unit 2' is stopped,
In order to prevent the flow of refrigerant to the indoor unit 2', a closing electromagnetic on-off valve 12' connected in series with the cooling expansion mechanism 7' is fully closed.
ここで、暖房運転時の場合には、停止中の室内
ユニツト２′の室内熱交換器８′は、ガス側分岐連
絡配管１４a′を介して、圧縮機３′からの高圧ガ
ス冷媒が流通するガス側連絡配管１４′に連通し
ているため、高圧ガス冷媒が停止中の室内熱交換
器８′内で凝縮滞留するとともに高圧ガス冷媒中
に含まれている冷凍機油も冷媒と一緒に滞留す
る。このため、滞留量が多くなるとガス欠運転及
び冷凍機油不足となる可能性があるので、これを
防止する対策として、冷凍機油を含む滞留液冷媒
を暖房時蒸発器となる室外熱交換器の入口側にバ
イパス導入させるためのバイパス管を特別に設け
たり、または、別の対策として、停止中の室内ユ
ニツト２′の閉鎖用電磁開閉弁１２′を停止時間が
一定時間経過したら所定時間解放するようにし
て、停止中の室内ユニツト２′から冷凍機油を含
む液冷媒が流出するようにし、大量に滞留しない
ようにしていた。 Here, in the case of heating operation, the high-pressure gas refrigerant from the compressor 3' flows through the indoor heat exchanger 8' of the stopped indoor unit 2' via the gas side branch connection pipe 14a'. Since it communicates with the gas side communication pipe 14', the high-pressure gas refrigerant condenses and stagnates inside the indoor heat exchanger 8' when it is stopped, and the refrigerating machine oil contained in the high-pressure gas refrigerant also stagnates together with the refrigerant. . For this reason, if the accumulated amount increases, there is a possibility of gas starvation operation and refrigerating machine oil shortage.As a countermeasure to prevent this, the accumulated refrigerant containing refrigerating machine oil is transferred to the inlet of the outdoor heat exchanger, which serves as the evaporator during heating. A special bypass pipe may be installed on the side to introduce the bypass, or as another measure, the electromagnetic on-off valve 12' for closing the stopped indoor unit 2' may be opened for a predetermined period of time after a certain period of stop time has elapsed. In this way, the liquid refrigerant containing refrigerating machine oil flows out from the stopped indoor unit 2' to prevent it from accumulating in large quantities.
（発明が解決しようとする課題）
しかしながら、冷房運転時の場合には、停止中
の室内ユニツト２′の室内熱交換器８′は、ガス側
分岐連絡配管１４a′を介して圧縮機３′へ吸入さ
れる低圧ガス冷媒が流通するガス側連絡配管１
４′に連通しているため、かりに閉鎖用電磁開閉
弁１２′から液冷媒が少量もれても圧縮機３′に吸
入されることとなり、室内熱交換器８′内に冷媒
が滞留することがないのであるが、冷凍機油につ
いては、液側分岐連絡配管１３a′中の液冷媒に溶
けたままで滞留するとともに、もれによる冷媒の
流速は非常に小さいので、室内熱交換器８′のパ
イプ内壁に付着している油が圧縮機３′に吸引さ
れずそのまま滞留する問題があつた。これは、冷
凍機油の粘性は大きいので、流通する冷媒の流速
が所定以上でないと冷媒と一緒に冷凍機油が圧縮
機３′まで戻らないからである。このため、圧縮
機３′内の冷凍機油が減少し、潤滑不足をきたす
おそれがあつた。(Problem to be Solved by the Invention) However, during cooling operation, the indoor heat exchanger 8' of the stopped indoor unit 2' is connected to the compressor 3' via the gas side branch connection pipe 14a'. Gas side communication pipe 1 through which the low-pressure gas refrigerant to be sucked flows
4', even if a small amount of liquid refrigerant leaks from the closing electromagnetic on-off valve 12', it will be sucked into the compressor 3', and the refrigerant will not accumulate in the indoor heat exchanger 8'. However, the refrigerating machine oil remains dissolved in the liquid refrigerant in the liquid side branch connecting pipe 13a', and the flow rate of the refrigerant due to leakage is very low, so the pipe of the indoor heat exchanger 8' There was a problem that oil adhering to the inner wall was not sucked into the compressor 3' and remained there. This is because the viscosity of the refrigerating machine oil is high, and unless the flow rate of the circulating refrigerant exceeds a predetermined value, the refrigerating machine oil will not return to the compressor 3' together with the refrigerant. As a result, the amount of refrigerating machine oil in the compressor 3' may decrease, leading to a risk of insufficient lubrication.
本発明は、上記の点に鑑みてなされたもので、
冷房運転時、停止中の室内ユニツトにおける液側
分岐連絡配管および室内熱交換器への冷凍機油の
滞留を解消することを目的とするものである。 The present invention has been made in view of the above points, and
The purpose of this system is to eliminate the accumulation of refrigerating machine oil in the liquid side branch connection piping and indoor heat exchanger in a stopped indoor unit during cooling operation.
（課題を解決するための手段）
本発明では、上記課題を解決するための手段と
して、第１図に示すように、１台の室外ユニツト
１と、該室外ユニツト１に接続される液側連絡配
管１３及びガス側連絡配管１４と、液側連絡配管
１３及びガス側連絡配管１４から各々並列に分岐
された複数の液側分岐連絡配管１３ａ……及びガ
ス側分岐連絡配管１４ａ……と、各液側分岐連絡
配管１３ａ……と各ガス側分岐連絡配管１４ａ…
…との間に接続される複数台の室内ユニツト２…
…とからなる空気調和装置において、前記各室内
ユニツト２……には、冷房運転時に膨張機構とし
て作用するとともに各室内ユニツト２停止時に閉
止する如く作用する室内側電動弁７を設けるとと
もに、冷房運転時において前記室内ユニツト２…
…のうち少なくとも１台の運転中に残りのどれか
の停止状態が一定時間経過した時、この停止状態
が一定時間経過した室内ユニツト２の室内側電動
弁７を所定時間開状態とする如く作用する弁制御
装置１０を付設したものである。(Means for Solving the Problems) In the present invention, as a means for solving the above problems, as shown in FIG. The pipe 13 and the gas side communication pipe 14, and the plurality of liquid side branch communication pipes 13a and gas side branch communication pipes 14a branched in parallel from the liquid side communication pipe 13 and the gas side communication pipe 14, respectively. Liquid side branch connection pipe 13a... and each gas side branch connection pipe 14a...
Multiple indoor units 2 connected between...
In an air conditioner consisting of..., each indoor unit 2... is provided with an indoor electric valve 7 that acts as an expansion mechanism during cooling operation and closes when each indoor unit 2 is stopped; At the time, the indoor unit 2...
When at least one of the remaining units is in a stopped state for a certain period of time while operating, the indoor electric valve 7 of the indoor unit 2 whose stopped state has been stopped for a certain period of time is opened for a certain period of time. A valve control device 10 is attached thereto.
（作用）
本発明では、上記手段によつて次のような作用
が得られる。(Function) In the present invention, the following effects can be obtained by the above means.
即ち、冷房運転時において、複数台の室内ユニ
ツト２……のうち少なくとも１台の運転中に残り
のどれかの停止状態が一定時間経過した時、この
停止状態が一定時間経過した室内ユニツト２の室
内側電動弁７を所定時間開状態とするので、液側
分岐連絡配管１３ａ側の冷凍機油を含んだ液冷媒
が室内熱交換器８へ流入することとなり、これに
より冷媒の流速が速くなり、室内熱交換器８のパ
イプ内壁に付着した冷凍機油が冷媒とともに圧縮
機３側へ戻ることとなる。従つて、停止中の室内
ユニツト２側における液側分岐連絡配管１３ａお
よび室内熱交換器８内に滞留していた冷凍機油が
圧縮機３側へ回収される。 That is, during cooling operation, when at least one of the plurality of indoor units 2... remains in a stopped state for a certain period of time, the indoor unit 2 that has been in a stopped state for a certain period of time Since the indoor electric valve 7 is kept open for a predetermined period of time, the liquid refrigerant containing refrigerating machine oil on the liquid side branch connecting pipe 13a side will flow into the indoor heat exchanger 8, thereby increasing the flow rate of the refrigerant. The refrigerating machine oil adhering to the inner wall of the pipe of the indoor heat exchanger 8 returns to the compressor 3 side together with the refrigerant. Therefore, the refrigerating machine oil that had accumulated in the liquid-side branch connecting pipe 13a and the indoor heat exchanger 8 on the indoor unit 2 side that is stopped is recovered to the compressor 3 side.
（実施例）
以下、第１図および第２図を参照して、本発明
の好適な実施例を説明する。(Example) Hereinafter, a preferred example of the present invention will be described with reference to FIGS. 1 and 2.
本実施例の空気調和装置は、第１図図示のよう
に、１台の室内ユニツト１と、該室外ユニツト１
に接続される液側連絡配管１３及びガス側連絡配
管１４と、液側連絡配管１３及びガス側連絡配管
１４から各々並列に分岐された複数の液側分岐連
絡配管１３ａ……及びガス側分岐連絡配管１４ａ
……と、各液側分岐連絡配管１３ａ……と各ガス
側分岐連絡配管１４ａ……との間に接続される複
数台の室内ユニツト２……とからなる。前記室外
ユニツト１は、圧縮機３、四路切換弁４、室外熱
交換器５、室外側電動弁６およびアキユムレータ
９から構成され、また、前記室内ユニツト２は、
室内側電動弁７および室内熱交換器８から構成さ
れている。そして、第１図の如く冷媒配管により
接続されて形成された冷媒回路において、冷媒
は、冷房運転時には実線矢印で示す方向に、暖房
運転時には点線矢印で示す方向に循環せしめられ
るようになつている。符号１３は室外フアン、１
４は室内フアンである。 As shown in FIG. 1, the air conditioner of this embodiment includes one indoor unit 1 and an outdoor unit 1.
The liquid side connecting pipe 13 and the gas side connecting pipe 14 are connected to the liquid side connecting pipe 13 and the gas side connecting pipe 14, and the liquid side connecting pipe 13a is branched in parallel from the liquid side connecting pipe 13 and the gas side connecting pipe 14, respectively. Piping 14a
. . . and a plurality of indoor units 2 connected between each liquid side branch communication pipe 13a . . . and each gas side branch communication pipe 14a . The outdoor unit 1 includes a compressor 3, a four-way switching valve 4, an outdoor heat exchanger 5, an outdoor electric valve 6, and an accumulator 9, and the indoor unit 2 includes:
It is composed of an indoor electric valve 7 and an indoor heat exchanger 8. In the refrigerant circuit connected by refrigerant pipes as shown in Fig. 1, the refrigerant is circulated in the direction shown by the solid line arrow during cooling operation and in the direction shown by the dotted line arrow during heating operation. . Code 13 is an outdoor fan, 1
4 is an indoor fan.
前記電動弁６，７としては、250ステツプの開
度調節を行うことのできる開度調節可能なものが
用いられており、本実施例の場合、それぞれが冷
房用および暖房用の膨張機構と閉鎖用開閉弁とを
兼用している。 As the electric valves 6 and 7, valves whose opening can be adjusted in 250 steps are used, and in the case of this embodiment, each has an expansion mechanism for cooling and heating, and a closing mechanism. It also serves as an on-off valve.
また、本実施例の空気調和装置における室内側
電動弁７は、後述するような作用を有する弁制御
装置１０によつて開閉制御せしめられるようにな
つている。 Further, the indoor motor-operated valve 7 in the air conditioner of this embodiment is controlled to open and close by a valve control device 10 having the function described below.
この制御装置１０は、室内ユニツト２……のう
ちのどれかの停止状態が一定時間（例えば、３時
間）経過した時、前記室内側電動弁７を所定時間
（例えば、３分間）冷凍機油を圧縮機３に戻すの
に充分な開状態、例えば全開状態とする如く作用
するものであり、２種のタイマーにより構成され
ている。 This control device 10 controls the indoor electric valve 7 to supply refrigerating machine oil for a predetermined period of time (e.g., 3 minutes) when any of the indoor units 2 has been stopped for a predetermined period of time (e.g., 3 hours). It functions to maintain an open state sufficient to return the air to the compressor 3, for example, a fully open state, and is composed of two types of timers.
次いで図示の空気調和装置の作用を第２図図示
のフローチヤートを参照して説明する。 Next, the operation of the illustrated air conditioner will be explained with reference to the flowchart illustrated in FIG.
空気調和装置の冷房運転中において（ステツプ
S0）、１室の室内フアン１４の運転が停止される
と（ステツプS1）、フアン停止中の室内ユニツト
２における室内側電動弁７は閉止状態とされる
（ステツプS2）。その後該室内ユニツト２（換言す
れば、室内フアン１４）の停止状態が一定時間
T1（本実施例では、３時間）経過すると（ステツ
プS3）、室内側電動弁７は全開状態とされる（ス
テツプS4）。そして前記室内側電動弁７の全開状
態が所定時間T2（本実施例では、３分間）経過す
ると（ステツプS5）、前記室内側電動弁７は閉止
状態に復帰される（ステツプS6）。そして上記一
連の制御が完了する（ステツプS7）。 During cooling operation of the air conditioner (step
S 0 ), when the operation of the indoor fan 14 in one room is stopped (step S 1 ), the indoor electric valve 7 in the indoor unit 2 whose fan is stopped is closed (step S 2 ). After that, the indoor unit 2 (in other words, the indoor fan 14) remains stopped for a certain period of time.
When T 1 (three hours in this embodiment) has elapsed (step S 3 ), the indoor electric valve 7 is fully opened (step S 4 ). When the indoor motor-operated valve 7 remains fully open for a predetermined time T 2 (3 minutes in this embodiment) (step S 5 ), the indoor motor-operated valve 7 is returned to the closed state (step S 6 ). . Then, the above series of controls is completed (step S7 ).
上記の如き弁開閉制御を行うことにより、液側
分岐連絡配管１３ａ側の冷凍機油を含んだ液冷媒
が室内熱交換器８へ流入することとなり、これに
より冷媒の流速が速くなり、室内熱交換器８のパ
イプ内壁に付着した冷凍機油が冷媒とともに圧縮
機３側へ戻ることとなる。従つて、停止中の室内
ユニツト２側における液側分岐連絡配管１３ａお
よび室内熱交換器８内に滞留していた冷凍機油が
圧縮機３側へ回収されることとなる。 By controlling the opening and closing of the valves as described above, the liquid refrigerant containing refrigerating machine oil on the liquid side branch connecting pipe 13a side will flow into the indoor heat exchanger 8, thereby increasing the flow rate of the refrigerant and causing indoor heat exchange. The refrigerating machine oil adhering to the inner wall of the pipe of the container 8 returns to the compressor 3 side together with the refrigerant. Therefore, the refrigerating machine oil that had accumulated in the liquid side branch connection pipe 13a and the indoor heat exchanger 8 on the indoor unit 2 side that is stopped is recovered to the compressor 3 side.
上記実施例では、ヒートポンプ式の空気調和装
置について説明したが、冷房専用の空気調和装置
にも適用可能なことは勿論である。 In the above embodiment, a heat pump type air conditioner has been described, but it is of course applicable to an air conditioner exclusively for cooling.
また、本発明は、図示の実施例に限定されるも
のではなく、発明の要旨を逸脱しない範囲におい
て適宜設計変更可能なことは勿論である。 Further, the present invention is not limited to the illustrated embodiment, and it goes without saying that the design can be changed as appropriate without departing from the gist of the invention.
（発明の効果）
叙上の如く、本発明によれば、停止中の室内ユ
ニツト２における液側分岐連絡配管１３ａおよび
室内熱交換器８内に滞留していた冷凍機油が圧縮
機３側へ回収され、圧縮機３内の冷凍機油不足を
未然に防止することができるという効果がある。(Effects of the Invention) As described above, according to the present invention, the refrigerating machine oil that had accumulated in the liquid side branch connection pipe 13a and the indoor heat exchanger 8 in the stopped indoor unit 2 is recovered to the compressor 3 side. This has the effect of being able to prevent a shortage of refrigerating machine oil in the compressor 3.
第１図は、本発明の実施例にかかる空気調和装
置の冷媒回路図、第２図は、本発明の実施例にか
かる空気調和装置の作用を示すフローチヤート、
第３図は、従来の空気調和装置の冷媒回路図であ
る。
１……室外ユニツト、２……室内ユニツト、７
……室内側電動弁、１０……弁制御装置、１３…
…液側連絡配管、１３ａ……液側分岐連絡配管、
１４……ガス側連絡配管、１４ａ……ガス側分岐
連絡配管。
FIG. 1 is a refrigerant circuit diagram of an air conditioner according to an embodiment of the present invention, and FIG. 2 is a flowchart showing the operation of the air conditioner according to an embodiment of the present invention.
FIG. 3 is a refrigerant circuit diagram of a conventional air conditioner. 1...Outdoor unit, 2...Indoor unit, 7
...Indoor electric valve, 10...Valve control device, 13...
...liquid side connection piping, 13a...liquid side branch connection piping,
14...Gas side connecting pipe, 14a...Gas side branch connecting pipe.
Claims (1)
に接続される液側連絡配管１３及びガス側連絡配
管１４と、液側連絡配管１３及びガス側連絡配管
１４から各々並列に分岐された複数の液側分岐連
絡配管１３ａ……及びガス側分岐連絡配管１４ａ
……と、各液側分岐連絡配管１３ａ……と各ガス
側分岐連絡配管１４ａ……との間に接続される複
数台の室内ユニツト２……とからなる空気調和装
置において、前記各室内ユニツト２には、冷房運
転時に膨張機構として作用するとともに各室内ユ
ニツト２停止時に閉止する如く作用する室内側電
動弁７を設けるとともに、冷房運転時において前
記室内ユニツト２……のうち少なくとも１台の運
転中に残りのどれかの停止状態が一定時間経過し
た時、この停止状態が一定時間経過した室内ユニ
ツト２の室内側電動弁７を所定時間開状態とする
如く作用する弁制御装置１０を付設したことを特
徴とする空気調和装置。1 One outdoor unit 1 and the outdoor unit 1
The liquid side connecting pipe 13 and the gas side connecting pipe 14 are connected to the liquid side connecting pipe 13 and the gas side connecting pipe 14, and the liquid side connecting pipe 13a is branched in parallel from the liquid side connecting pipe 13 and the gas side connecting pipe 14, respectively. Piping 14a
... and a plurality of indoor units 2 connected between each liquid side branch connecting pipe 13a... and each gas side branch connecting pipe 14a... 2 is provided with an indoor electric valve 7 that acts as an expansion mechanism during cooling operation and closes when each indoor unit 2 is stopped, and also prevents the operation of at least one of the indoor units 2 during cooling operation. A valve control device 10 is attached thereto that operates to open the indoor electric valve 7 of the indoor unit 2 which has been stopped for a certain period of time when any of the remaining stopped states has elapsed for a certain period of time. An air conditioner characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9087486A JPS62258971A (en) | 1986-04-19 | 1986-04-19 | Air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9087486A JPS62258971A (en) | 1986-04-19 | 1986-04-19 | Air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62258971A JPS62258971A (en) | 1987-11-11 |
| JPH0577945B2 true JPH0577945B2 (en) | 1993-10-27 |
Family
ID=14010641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9087486A Granted JPS62258971A (en) | 1986-04-19 | 1986-04-19 | Air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62258971A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63198965U (en) * | 1987-06-10 | 1988-12-21 | ||
| JP2564903B2 (en) * | 1988-08-05 | 1996-12-18 | 三菱電機株式会社 | Multi-room air conditioner |
| JPH02225955A (en) * | 1989-02-28 | 1990-09-07 | Matsushita Refrig Co Ltd | Mutli-chamber type air conditioner |
| JP2875665B2 (en) * | 1991-01-10 | 1999-03-31 | 三菱電機株式会社 | Air conditioner |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62125265A (en) * | 1985-11-25 | 1987-06-06 | 株式会社東芝 | Air conditioner |
-
1986
- 1986-04-19 JP JP9087486A patent/JPS62258971A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62125265A (en) * | 1985-11-25 | 1987-06-06 | 株式会社東芝 | Air conditioner |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62258971A (en) | 1987-11-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |