JP2932720B2 - Operating device for power equipment - Google Patents

Operating device for power equipment

Info

Publication number
JP2932720B2
JP2932720B2 JP3055791A JP3055791A JP2932720B2 JP 2932720 B2 JP2932720 B2 JP 2932720B2 JP 3055791 A JP3055791 A JP 3055791A JP 3055791 A JP3055791 A JP 3055791A JP 2932720 B2 JP2932720 B2 JP 2932720B2
Authority
JP
Japan
Prior art keywords
transmission lever
drive
drive transmission
nut
lever
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
Application number
JP3055791A
Other languages
Japanese (ja)
Other versions
JPH04269415A (en
Inventor
泉 瀧
貴文 渡辺
博文 植松
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Meidensha Corp
Original Assignee
Meidensha Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Meidensha Corp filed Critical Meidensha Corp
Priority to JP3055791A priority Critical patent/JP2932720B2/en
Publication of JPH04269415A publication Critical patent/JPH04269415A/en
Application granted granted Critical
Publication of JP2932720B2 publication Critical patent/JP2932720B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】ガス絶縁開閉器等電力機器におけ
る断路器,接地開閉器の電動操作装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric operating device for a disconnecting switch and a grounding switch in power equipment such as a gas insulated switch.

【0002】[0002]

【従来の技術】従来、電力機器用操作装置には、電動機
操作方式と電動ばね操作方式がある。
2. Description of the Related Art Conventionally, operating devices for electric power equipment include a motor operating system and an electric spring operating system.

【0003】電動機操作方式は、図6に示すように、モ
ータMにより歯車列1を介して駆動用ねじ2を回動さ
せ、これに螺合している駆動用ナット3を移行させ、こ
の両側のローラフォロア31,32に駆動伝達用レバー5
の一対の爪51,52を係合させて、駆動伝達用レバー5
の軸9に連結されているSF6ガス中部の操作用レバー
11を回動させ、リンク12を介して断路器又は接地開
閉器の可動コンタクト13を操作して、投入又は開極し
ている。
As shown in FIG. 6, a motor operating system rotates a driving screw 2 via a gear train 1 by a motor M, and shifts a driving nut 3 screwed to the driving screw 2 so as to move the driving nut 2 on both sides. Transmission lever 5 on roller followers 3 1 and 3 2
The pair of claws 5 1 and 5 2 are engaged with each other to
The operating lever 11 in the middle of the SF 6 gas connected to the shaft 9 is rotated, and the movable contact 13 of the disconnector or the earthing switch is operated via the link 12 to turn on or open the electrode.

【0004】この操作装置において、駆動用ねじ2に台
形ねじを使用した場合、ねじの効率が良くないため、駆
動伝達用レバー5を長くすると共に駆動用ナット3の移
動距離を長くして駆動する必要があり、装置全体が大き
くなる。
In this operating device, when a trapezoidal screw is used as the driving screw 2, the efficiency of the screw is not good, so that the driving transmission lever 5 is lengthened and the driving nut 3 is moved with a longer moving distance. Need to be made, and the whole device becomes large.

【0005】これに対し、駆動用ねじ2にボールねじを
使用した場合、ねじの効率が良くなるため、装置全体を
コンパクトにすることが可能になる。しかし図7に示す
ように、極柱部(断路器又は接地開閉器本体部)20の
自重が振動で軸9によりダイレクトに結合された駆動伝
達レバー5からの力が駆動用ナットのローラフォロア3
1,32に加わり、その駆動用ねじ2の軸方向成分により
駆動用ねじ2が回動して駆動用ナット3が軸方向に移動
し、駆動伝達レバー5が回動するため、投入,開極位置
がずれることがある。
On the other hand, when a ball screw is used as the driving screw 2, the efficiency of the screw is improved, so that the whole apparatus can be made compact. However, as shown in FIG. 7, the force from the drive transmission lever 5 directly connected by the shaft 9 due to the vibration of the pole column (disconnector or grounding switch main body) 20 is applied to the roller follower 3 of the driving nut.
1, 3 2 joined, by the axial component of the drive screw 2 is driven screw 2 is driven nut 3 rotates to move in the axial direction, since the drive transmitting lever 5 is rotated, turned, open The pole position may shift.

【0006】このため、図8に示すように、駆動伝達用
レバー5に切欠部251,252を設けてロック装置26
により投入及び開極位置をロックするようにしている。
For this purpose, as shown in FIG. 8, notches 25 1 and 25 2 are provided in the drive transmission lever 5 to lock the lock device 26.
To lock the closing and opening positions.

【0007】また、図9に示すように、投入又は開極時
に操作レバー11がストッパー191又は192に当った
ら駆動用ねじ2の回動を停止させるため、駆動伝達用レ
バー5又は駆動用ナット3の位置を検知しモータMを停
止させるリミットスイッチ231,232を設けると共
に、モータ1にモータ切離し装置22を取付けて切離し
レバー221によりモータMを切離して、位置決め用ス
トッパー191,192に無理な力が作用して破損するこ
とのないようにしている。
Further, as shown in FIG. 9, since the operation lever 11 when up or opening stops the rotation of the drive screw 2 Once hits the stopper 19 1 or 19 2, the drive transmitting lever 5 or drive provided with a limit switch 23 1, 23 2 to stop the motor M to detect the position of the nut 3, and disconnects the motor M by disconnecting lever 22 1 is attached to motor disconnect device 22 to the motor 1, the positioning stopper 19 1, excessive force to 19 2 are in so as not to be damaged by the action.

【0008】また、電動ばね操作方式は、図10に示す
ように、駆動用ナット3の移行により蓄勢用レバー6を
回動させ、凸部61,62によりばね用レバー7を介して
操作用ばね8を蓄勢し、ばね用レバー7がデッドポイン
トを通過すると操作用ばね8の放勢によりばね用レバー
7を回動させ、軸9,カム10を介して操作用レバー1
1を回動させ、リンク12を介して可動コンタクト13
を投入又は開極するようにしている。
In the electric spring operating method, as shown in FIG. 10, the energy storage lever 6 is rotated by shifting the driving nut 3, and the projections 6 1 and 6 2 are used to move the spring 7 through the spring lever 7. When the operating spring 8 passes through a dead point, the operating spring 8 is released and the spring lever 7 is rotated by the release of the operating spring 8.
1 to move the movable contact 13 through the link 12.
Is turned on or opened.

【0009】このため、モータMが投入又は開極時に直
ちに切れなくても、蓄勢用レバー6とばね用レバー7と
の係合に遊びがあるため、蓄勢用レバー6からばね用レ
バー7へ力が伝わることはなく、ストッパー191,1
2に過大な力が作用することのないようになってい
る。
For this reason, even if the motor M is not turned off immediately when the motor M is turned on or opened, there is play in the engagement between the energy-storing lever 6 and the spring lever 7. No force is transmitted to the stopper 19 1 , 1
9 excessive force to 2 is adapted to not to act.

【0010】[0010]

【発明が解決しようとする課題】上記従来電力機器用操
作装置は、極柱部の自重や振動によって投入状態又は開
極状態の位置が動かないようにするためのロック装置が
必要であり、また操作レバーがストッパーに当たった投
入又は開極完了状態において操作力が作用しないように
するため、リミットスイッチを設けてモータを停止させ
たり、モータを切離したりする等の手段を必要とするの
で、構成が複雑になる欠点があった。
The above-mentioned conventional operating device for electric power equipment requires a lock device for preventing the position of the closed state or the closed state from moving due to the weight and vibration of the pole column. In order to prevent the operation force from acting when the operating lever hits the stopper or when the opening is completed, a means such as stopping the motor by providing a limit switch or disconnecting the motor is required. Had the disadvantage of becoming complicated.

【0011】本発明は、従来のこのような問題点に鑑み
てなされたものであり、その目的とするとろこは、極柱
部の自重や振動による投入状態,開極状態の位置ずれが
生じないと共に、投入,開極完了時にモータが直ちに停
止しなくても操作力が極柱部に過大に作用することがな
い電力機器用操作装置を提供することにある。
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a scale that is displaced by its own weight or vibration due to its own weight or vibration. Another object of the present invention is to provide an operating device for a power device in which an operating force does not excessively act on a pole portion even if a motor does not stop immediately upon completion of closing and opening.

【0012】[0012]

【課題を解決するための手段】上記目的を達成するため
に、本発明における電力機器用操作装置は、モータによ
り駆動用ねじを回転させ、このねじに螺合する駆動用ナ
ットを移行し、このナットに設けられたローラフォロア
により駆動伝達用レバーを回動させ、軸又はリンクを介
してガス中側の操作レバーを回動させてガス中側の極柱
部を投入,開極する操作装置において、前記駆動用ねじ
と平行に駆動用ナットの一方のローラフォロアと係合す
る駆動用ナット回転防止用ガイドを設けると共に、前記
駆動伝達レバーを駆動用ナットの他方のローラフォロア
と係合する爪部を、ローラフォロアの移行により投入,
開極まで駆動伝達用レバーを回動させることができ、か
つ、投入,開極完了後は駆動伝達用レバーを回動させな
い形状のカム面を有するものとするものである。
In order to achieve the above object, an operating device for a power device according to the present invention rotates a driving screw by a motor and shifts a driving nut screwed to the screw. In an operating device in which the drive transmission lever is rotated by a roller follower provided in a nut, and the gas-side operation lever is turned through a shaft or a link to turn on and open the gas-side pole portion. A guide for preventing rotation of the driving nut, which engages with one roller follower of the driving nut in parallel with the driving screw, and a pawl for engaging the drive transmission lever with the other roller follower of the driving nut. Is introduced by shifting the roller follower,
The drive transmission lever can be rotated up to the opening, and the cam surface has a shape that does not rotate the drive transmission lever after the closing and opening are completed.

【0013】上記爪部は駆動伝達レバーに調整可能に螺
着するとよい。
Preferably, the claw portion is screwed to the drive transmission lever so as to be adjustable.

【0014】[0014]

【作用】駆動用ねじをモータで回転させると、このねじ
に螺合した駆動用ナットは、その一方のローラフォロア
が駆動用ナット回転防止用ガイドに案内されているので
回転することなく駆動用ねじ軸方向に移行する。
When the driving screw is rotated by a motor, the driving nut screwed to the screw is not rotated since the one roller follower is guided by the driving nut rotation preventing guide. Move in the axial direction.

【0015】駆動伝達レバーの爪部カム面は他方のロー
ラフォロアと係合しているので、駆動用ナットが右移行
又は左移行すると駆動伝達レバーが回動して極柱部を投
入又は開極する。また、この爪部のカム面は投入又は開
極完了後駆動伝達レバーが回動しないようになっている
ので、駆動用ナットが投入又は開極完了位置を過ぎても
駆動伝達用レバーを回転させることも、また極柱部の自
重又は振動により駆動伝達用レバーが回動することもな
い。
Since the pawl cam surface of the drive transmission lever is engaged with the other roller follower, when the drive nut moves rightward or leftward, the drive transmission lever pivots to close or open the pole. I do. In addition, since the cam surface of the claw portion is configured so that the drive transmission lever does not rotate after the closing or opening is completed, the drive transmitting lever is rotated even when the driving nut passes the closing or opening completed position. In addition, the drive transmission lever does not rotate due to the own weight or vibration of the pole portion.

【0016】このため、投入又は開極完了直後にモータ
が停止しなくても極柱部のストッパーに無理な力が加わ
ることがない。また、極柱部の自重又は振動により駆動
伝達用レバーが回動して投入又は開極位置がずれるとい
うこともない。
Therefore, even if the motor is not stopped immediately after the closing or opening of the pole is completed, no excessive force is applied to the stopper at the pole portion. Further, there is no possibility that the drive transmission lever is rotated by the own weight or vibration of the pole column portion, and the closing or opening position is not shifted.

【0017】[0017]

【実施例】本発明の実施例を図面を参照して説明する。
なお、前記従来図6〜図10に示したものと同一構成部
分は、同一符号を付してその重複する説明を省略する。
An embodiment of the present invention will be described with reference to the drawings.
The same components as those shown in FIGS. 6 to 10 are denoted by the same reference numerals, and redundant description will be omitted.

【0018】図1〜図3について、4は駆動用ナット3
のローラフォロア32を駆動ねじ2の軸方向に案内する
溝41を有する駆動用ナットの回転防止用ガイド板、5
1は駆動用ナット3により回動される駆動伝達用レバー
である。
1 to 3, reference numeral 4 denotes a driving nut 3.
The roller follower 3 2 guides in the axial direction of the drive screw 2 grooves 4 1 anti-rotation guide plate driving nut having, 5
Reference numeral 1 denotes a drive transmission lever which is rotated by a drive nut 3.

【0019】駆動伝達用レバー51の一対の爪部5
1,512は駆動用ナットと係合する投入用カム面aと
開極用カム面bとを備えており、このカム面a,bは図
2の(2)に示す中間位置から駆動用ナット3を右移行
又は左移行させることにより、図2の(3)又は(1)
に示す投入状態又は開極状態とすることができ、この投
入状態又は開極状態においてカム面a又はbは夫々駆動
ねじ2の軸と平行となり、それ以上駆動用ナット3が右
移行又は左移行しても駆動伝達用レバー51は回動せ
ず、又駆動伝達用レバー51に極柱部側から回転力が加
わっても回転しないようになっている。
A pair of claws 5 of the drive transmission lever 51
Reference numerals 1 1 and 512 each include a closing cam surface a and an opening cam surface b which engage with a driving nut. The cam surfaces a and b are driven from an intermediate position shown in FIG. (3) or (1) in FIG.
The cam surface a or b is in parallel with the axis of the drive screw 2 in this closed state or opened state, and the driving nut 3 is further shifted rightward or leftward. However, the drive transmission lever 51 does not rotate, and does not rotate even when a rotational force is applied to the drive transmission lever 51 from the pole column side.

【0020】以上のように構成されているので、駆動用
ナット3を移行させて可動コンタクト13を投入又は開
極させた後、モータMが直ちに停止せずに駆動用ナット
が移動しても駆動伝達レバー51は回動しないので、ス
トッパー191,192は破損しない。又、投入又は開極
状態において極柱部の自重や振動による力が駆動伝達用
レバーに伝わり駆動用ナットに作用しても、カム面a,
bの力がローラフォロア31に対し垂直に作用し、駆動
伝達用レバー51は回動しないので、投入位置,開極位
置が変わることはない。
Since the driving nut 3 is shifted and the movable contact 13 is turned on or opened, the motor M does not stop immediately and the driving nut moves even if the driving nut moves. Since the transmission lever 51 does not rotate, the stoppers 19 1 and 19 2 are not damaged. Further, even if the force due to the own weight or vibration of the pole column is transmitted to the drive transmission lever and acts on the drive nut in the closed or opened state, the cam surfaces a,
b of force acts vertically to the roller follower 3 1, the drive transmitting lever 51 does not rotate, loading position, will not be changed opening position.

【0021】上記実施例では、ローラフォロア31に係
合する駆動伝達用レバー51の一対の爪部511,512
をカム面a,bとして設けられているが、図4,図5に
示すように、カム面a,bを有する爪531,532をね
じ58を用いて駆動伝達用レバー52の一端に最適な投
入,開極状態が得られるように、調整して固着し、駆動
伝達用レバー52の一対の爪部としてもよい。
[0021] In the above embodiment, the pair of claw portions 51 1 of the power transmission lever 51 engages the roller follower 3 1, 51 2
A cam surface a, but is provided as b, 4 as shown in FIG. 5, the cam surface a, the pawl 53 1, 53 2 with b the driving end of the transmission lever 52 by means of screws 58 A pair of claws of the drive transmission lever 52 may be adjusted and fixed so that an optimum closing and opening state is obtained.

【0022】また、上記実施例では、駆動伝達用レバー
51と操作用レバー11を軸9で直結しているが、図5
に示すように、駆動伝達用レバーと共に回動するレバー
25及び操作用レバー11と共に回動するレバー27を
設け、レバー25と27をリンク26で結合してもよ
い。
In the above embodiment, the drive transmission lever 51 and the operation lever 11 are directly connected by the shaft 9.
As shown in FIG. 7, a lever 25 that rotates together with the drive transmission lever and a lever 27 that rotates together with the operation lever 11 may be provided, and the levers 25 and 27 may be connected by a link 26.

【0023】[0023]

【発明の効果】本発明は、上述のとおり構成されている
ので、次に記載する効果を奏する。
Since the present invention is configured as described above, the following effects can be obtained.

【0024】(1)極柱本体部の自重や振動によって操
作装置が動くことがないので、極柱本体の投入状態,開
極状態の位置がずれることがない。
(1) Since the operating device does not move due to its own weight or vibration of the pole body, the position of the pole body in the closed state and the opened state does not shift.

【0025】(2)投入,開極完了時に直ちにモータが
停止しなくても駆動伝達用レバーは投入,開極完了時に
回動しなくなるので、モータからの操作力が極柱本体部
のストッパー等に過大に作用しない。
(2) Even if the motor does not stop immediately after the closing and opening of the pole, the drive transmission lever does not rotate when the closing and opening of the pole is completed. Does not act excessively.

【0026】(3)投入,開極状態保持用のロック装置
を別途取付ける必要がなく、構造が簡単となり、部品点
数が少なくなるためコストダウンとなる。
(3) There is no need to separately install a lock device for closing and maintaining the contact opening state, which simplifies the structure and reduces the number of parts, resulting in cost reduction.

【0027】(4)請求項2のものは、極柱部本体部が
ガスタンク内にあって目視確認できなくてもストッパー
に当てた状態でタンク外にある一対の爪を調整して投
入,開極位置決めを簡単に行うことが可能となる。
(4) According to the second aspect of the present invention, the pair of claws located outside the tank are adjusted and inserted and opened while the pole column main body is in the gas tank and cannot be visually checked even when the pole column body is in contact with the stopper. Polar positioning can be easily performed.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の実施例にかかる操作装置の構成図。FIG. 1 is a configuration diagram of an operation device according to an embodiment of the present invention.

【図2】同実施例装置の要部動作説明図。FIG. 2 is an explanatory diagram of an operation of a main part of the apparatus of the embodiment.

【図3】同実施例装置の要部側面構成図。FIG. 3 is a side view of a main part of the apparatus of the embodiment.

【図4】カムを取着した駆動伝達レバーを用いた場合の
調整説明図。
FIG. 4 is an explanatory diagram of adjustment when a drive transmission lever with a cam is used.

【図5】駆動軸をリンクとした場合の要部構成図。FIG. 5 is a main part configuration diagram when a drive shaft is a link.

【図6】従来電動操作方式の操作装置の構成図。FIG. 6 is a configuration diagram of a conventional electric operation type operation device.

【図7】同従来装置の要部動作説明図。FIG. 7 is an operation explanatory view of a main part of the conventional device.

【図8】同従来装置のロック手段の説明図。FIG. 8 is an explanatory view of a lock means of the conventional device.

【図9】同従来装置のモータの駆動停止手段の説明図。FIG. 9 is an explanatory view of a motor drive stopping means of the conventional device.

【図10】従来電動ばね操作方式の操作装置の構成図。FIG. 10 is a configuration diagram of a conventional electric spring operation type operation device.

【符号の説明】[Explanation of symbols]

M…モータ 1…歯車列 2…駆動用ねじ 3…駆動用ナット 4…回転防止用ガイド板 5,51,52…駆動伝達用レバー 511,512…爪部 531,532…爪 6…蓄勢レバー 7…ばね用レバー 8…操作用ばね 9…軸 10…カム 11…操作用レバー 12…リンク 13…可動コンタクト 14,15…固定コンタクト 191,192…ストッパー 20…極柱部 21…タンク 22…モータ切離し装置 231,232…リミットスイッチ 251,252…切欠部 26…ロック装置 a,b…カム面M ... Motor 1 ... Gear train 2 ... Drive screw 3 ... Driving nut 4 ... Rotation prevention guide plate 5,51,52 ... Drive transmission lever 51 1 , 51 2 ... Claw portion 53 1 , 53 2 ... Claw 6 ... energizing lever 7 ... spring lever 8 ... operating spring 9 ... shaft 10 ... cam 11 ... operating lever 12 ... link 13 ... movable contact 14, 15 ... fixed contacts 19 1, 19 2 ... stopper 20 ... pole portion 21 ... tank 22 ... motor disconnecting device 23 1, 23 2 ... limit switch 25 1, 25 2 ... notch 26 ... locking device a, b ... cam surface

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平3−74019(JP,A) 実開 昭64−48836(JP,U) 実開 昭62−69334(JP,U) 実開 昭55−72717(JP,U) 実公 昭42−11043(JP,Y1) (58)調査した分野(Int.Cl.6,DB名) H01H 33/42 H01H 3/42 H01H 33/36 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-74019 (JP, A) Japanese Utility Model Showa 64-48836 (JP, U) Japanese Utility Model Showa 62-69334 (JP, U) Japanese Utility Model Showa 55- 72717 (JP, U) Jikken 42-11043 (JP, Y1) (58) Fields investigated (Int. Cl. 6 , DB name) H01H 33/42 H01H 3/42 H01H 33/36

Claims (2)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 モータにより駆動用ねじを回転させ、こ
のねじに螺合する駆動用ナットを移行し、このナットに
設けられたローラフォロアにより駆動伝達用レバーを回
動させ、軸又はリンクを介してガス中側の操作レバーを
回動させてガス中側の極柱部を投入,開極する操作装置
において、前記駆動用ねじと平行に駆動用ナットの一方
のローラフォロアと係合する駆動用ナット回転防止用ガ
イドを設けると共に、前記駆動伝達レバーを駆動用ナッ
トの他方のローラフォロアと係合する爪部を、ローラフ
ォロアの移行により投入,開極まで駆動伝達用レバーを
回動させることができ、かつ、投入,開極完了後は駆動
伝達用レバーを回動させない形状のカム面を有するもの
としたことを特徴とする電力機器用操作装置。
A drive screw is rotated by a motor, a drive nut screwed to the screw is shifted, and a drive follower provided on the nut is used to rotate a drive transmission lever, via a shaft or a link. In the operating device for turning on and off the operating pole on the gas side to open and close the pole portion on the gas side, the driving unit engages with one roller follower of the driving nut in parallel with the driving screw. A nut rotation preventing guide is provided, and a claw portion for engaging the drive transmission lever with the other roller follower of the drive nut is turned on by shifting the roller follower, and the drive transmission lever is rotated until the pole is opened. An operating device for electric power equipment, characterized in that the operating device has a cam surface which can be turned on and the drive transmission lever is not rotated after completion of closing and opening.
【請求項2】 爪部を、駆動伝達レバーに調整可能に螺
着したことを特徴とする請求項1記載の電力機器用操作
装置。
2. The operating device for power equipment according to claim 1, wherein the claw portion is adjustably screwed to the drive transmission lever.
JP3055791A 1991-02-26 1991-02-26 Operating device for power equipment Expired - Fee Related JP2932720B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3055791A JP2932720B2 (en) 1991-02-26 1991-02-26 Operating device for power equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3055791A JP2932720B2 (en) 1991-02-26 1991-02-26 Operating device for power equipment

Publications (2)

Publication Number Publication Date
JPH04269415A JPH04269415A (en) 1992-09-25
JP2932720B2 true JP2932720B2 (en) 1999-08-09

Family

ID=12307108

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3055791A Expired - Fee Related JP2932720B2 (en) 1991-02-26 1991-02-26 Operating device for power equipment

Country Status (1)

Country Link
JP (1) JP2932720B2 (en)

Also Published As

Publication number Publication date
JPH04269415A (en) 1992-09-25

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