JPH0749503Y2 - Pendulum test equipment - Google Patents
Pendulum test equipmentInfo
- Publication number
- JPH0749503Y2 JPH0749503Y2 JP1990071748U JP7174890U JPH0749503Y2 JP H0749503 Y2 JPH0749503 Y2 JP H0749503Y2 JP 1990071748 U JP1990071748 U JP 1990071748U JP 7174890 U JP7174890 U JP 7174890U JP H0749503 Y2 JPH0749503 Y2 JP H0749503Y2
- Authority
- JP
- Japan
- Prior art keywords
- thread
- plate
- weight
- protractor
- pendulum
- 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
Links
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- Length-Measuring Instruments Using Mechanical Means (AREA)
- Drawing Aids And Blackboards (AREA)
Description
【考案の詳細な説明】 ［産業上の利用分野］ 本考案は、錘を吊り下げた糸の長さを簡易迅速に変更す
ることが出来る単振り子の実験装置に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a simple pendulum experimental apparatus capable of easily and quickly changing the length of a thread on which a weight is suspended.
［従来の技術］ 単振り子は、一定の周期で一定の軸又は点の周りを運動
する物体（紐振り子又は実体振り子）が鉛直面内で微小
振動するものをいうが、以下の如く学校の実験装置とし
て用いられている。[Prior Art] A simple pendulum refers to an object (string pendulum or body pendulum) that moves around a fixed axis or point in a fixed cycle and vibrates slightly in the vertical plane. It is used as a device.
単振り子（紐振り子の場合）の周期Ｔは、 （１＝糸の長さ,g＝重力加速度） で表され、錘や振幅に無関係で糸の長さだけで決まる
（等時性）。従って、単振り子の周期Ｔと糸の長さ１を
正確に測定することにより、重力加速度ｇを求める実験
を行う。The period T of a simple pendulum (in the case of a string pendulum) is (1 = thread length, g = gravitational acceleration) and is determined by the thread length alone (isochronous) regardless of the weight and amplitude. Therefore, an experiment for obtaining the gravitational acceleration g is performed by accurately measuring the period T of the simple pendulum and the yarn length 1.
単振り子の錘には、重力と糸の張力が働いており、
張力は常に錘の運動方向と垂直に働いているので錘に対
して仕事をしない。従って、振り子の運動においては力
学的エネルギー保存の法則が成り立ち、これを利用して
速度や位置を求める実験を行う。Gravity and thread tension act on the weight of the simple pendulum,
Since the tension always works perpendicularly to the movement direction of the weight, it does not work on the weight. Therefore, in the motion of the pendulum, the law of conservation of mechanical energy is established, and the experiment to find the velocity and the position is performed by utilizing this law.
（以上，は中高生向け理科，物理実験） 糸に錘を吊るし、錘の重さ，糸の長さ，錘の振れ幅
を変え、錘の一往復する時間の違いいを調べる。その結
果から、単振り子の錘が一往復する時間は、錘の重さや
振れ幅に関係がなく、糸の長さだけによって変わること
を確認する実験を行う。(The above are science for middle and high school students, physical experiment) Suspend a weight on a thread, and change the weight of the weight, the length of the thread, and the swing width of the weight, and investigate the difference in the time for one reciprocation of the weight. From the results, we carry out an experiment to confirm that the time required for the weight of a single pendulum to make one reciprocation varies with the length of the thread, regardless of the weight and swing width of the weight.
単振り子の振れ軌道の最下点に物を置き、錘の振れ
幅及び重量を変えて、錘を物に衝突させ、物の動く距離
を測定することにより、当該距離が錘の重量，速度によ
って変わることを確認する実験を行う。An object is placed at the lowest point of the swing path of a simple pendulum, the swing width and weight of the weight are changed, the weight collides with the object, and the distance traveled by the object is measured. Experiment to confirm that it changes.
（以上，は小学校高学年向き理科実験） 上記した理科，物理実験に於いては、糸の長さ（糸の固
定点から、錘の中心迄の長さ）が、単振り子の実験の条
件として重要な位置を占めるものとなるが、従来提供さ
れている振り子実験装置は、台座に垂設された目盛り板
の上部に、糸を吊り下げる引掛杆を突出させて固定し、
糸の長さの調節は当該引掛杆部で糸の引掛け箇所を変え
る等して行っているものであった。(The above are science experiments for upper grades of elementary school) In the above science and physics experiments, the length of the thread (the length from the fixed point of the thread to the center of the weight) is an important condition for the experiment of the single pendulum. However, in the pendulum experimental device that has been conventionally provided, the hook rod for suspending the thread is projected and fixed on the upper part of the scale plate vertically installed on the pedestal,
The length of the thread is adjusted by changing the hooking position of the thread on the hooking rod.
［考案が解決しようとする課題］ しかし乍ら、上記の従来技術に係る振り子実験装置にお
いては、糸の長さを変更するに際し、一旦引掛杆部にお
ける糸の係合を解いた後、糸の長さを調節し、更に引掛
杆部に糸を係合させるようにしなければならず、この点
大変煩わしく、簡単で素早く糸の長さの変更をすること
が出来ないものであり、又糸の長さを短くした場合に
は、台座上面と糸の下端に取り付けて懸吊させた錘との
間の距離が離れてしまい、前記に記載の理科実験をす
ることが出来ないものとなる不都合があった。[Problems to be solved by the invention] However, in the pendulum experimental apparatus according to the above-mentioned conventional technique, when the length of the yarn is changed, the yarn is temporarily disengaged from the hook rod and then the yarn is The length must be adjusted, and the thread must be engaged with the hooking rod. This is very troublesome, and the thread length cannot be changed easily and quickly. When the length is shortened, the distance between the upper surface of the pedestal and the weight suspended and attached to the lower end of the thread becomes large, which makes it impossible to carry out the science experiment described above. there were.
本考案は、上記従来技術の問題点を解消するものであ
り、簡易迅速に糸の長さの変更を行なうことが出来、然
も糸の下端に取り付けて懸吊させた錘の上下左右の位置
に変更を来たすことなく前記の糸の長さの変更が出来、
更に、振り子の回動中心部となる糸の固定点に、糸の長
さを変更した場合においても常に分度器板の中心が位置
する様に構成し、理科，物理の実験に極めて利便性の良
い振り子実験装置を提供するものである。The present invention solves the above-mentioned problems of the prior art, and enables the length of a thread to be changed easily and quickly, and the positions vertically and horizontally of a weight suspended and attached to the lower end of the thread can be achieved. The length of the thread can be changed without making any changes to
Further, the center of the protractor plate is always located at the thread fixing point, which is the center of rotation of the pendulum, even when the thread length is changed, which is extremely convenient for science and physics experiments. A pendulum experimental device is provided.
［課題を解決するための手段］ 本考案を概説すると、前記の目的を達成するための振り
子実験装置に関するものであり、台座（１）上に垂設さ
れた目盛り板（２）と、この目盛り板（２）の上部に固
定された吊り下げ固定板（５）と、この吊り下げ固定板
（５）に懸吊されると共に先端に錘（３）が取り付けら
れた糸（４）と、前記目盛り板（２）の前面中央に付設
されたスライドレール（６）と、このスライドレール
（６）に跨座された係合部材（８）を介してスライドレ
ール（６）に沿って垂直方向に上下動自在とされる分度
器板（７）と、この分度器板（７）の中央上部に突設さ
れる糸挿通板（10）と、この糸挿通板（10）に設けられ
前記糸（４）の中間部が挿通される挿通孔又は条溝
（９）と、を有してなることを特徴としている。[Means for Solving the Problems] When the present invention is outlined, it relates to a pendulum experimental device for achieving the above-mentioned object, and is a scale plate (2) vertically installed on a pedestal (1) and this scale. A suspension fixing plate (5) fixed to the upper part of the plate (2); a thread (4) suspended from the suspension fixing plate (5) and having a weight (3) attached to the tip thereof; Vertically along the slide rail (6) via a slide rail (6) attached to the center of the front surface of the scale plate (2) and an engaging member (8) seated on the slide rail (6). A protractor plate (7) that can be moved up and down, a thread insertion plate (10) projecting from the upper center of the protractor plate (7), and the thread (4) provided on the thread insertion plate (10). And an insertion hole or a groove (9) through which the intermediate portion of the above is inserted.
［作用］ 本考案は上述の如き構成から成るものであり、分度器板
（７）の裏方には係合部材（８）を設け、台座（１）上
に垂設した目盛り板（２）の前面中央にはスライドレー
ル（６）を付設しており、スライドレール（６）に係合
部材（８）を跨座させて係合することにより、分度器板
（７）はスライドレール（６）上において上下動自在と
なる。[Operation] The present invention is configured as described above, and the engaging member (8) is provided on the back side of the protractor plate (7), and the front surface of the scale plate (2) vertically installed on the pedestal (1). A slide rail (6) is attached to the center, and the protractor plate (7) is mounted on the slide rail (6) by straddling and engaging the engagement member (8) with the slide rail (6). It can move up and down.
また、分度器板（７）の上部には挿通孔又は条溝（９）
を設けた糸挿通板（10）を突設し、目盛り板（２）の上
部には糸（４）を懸吊する吊り下げ固定板（５）を設け
ていることから、固定板（５）で適宜長さの糸（４）の
上部を固定し、次いで糸挿通板（10）の挿通孔又は条溝
（９）に挿通させて、糸（４）の先端に錘（３）を取り
付けることが出来、糸（４）及び錘（３）は糸挿通板
（10）の挿通孔又は条溝（９）部を中心として振り子運
動をするものとなり、糸挿通板（10）に設けた挿通孔又
は条溝（９）は糸（４）の固定点となり、前記の如く分
度器板（７）はスライドレール（６）上において上下動
自在となることから、分度器板（７）の上下動に伴ない
糸挿通板（10）も上下動するものとなり、任意に糸
（４）の固定点を変動し得るものとなって糸（４）の長
さの調節が自在となる。この場合、分度器板（７）の上
下動によっては糸（４）は外力を受けないので、糸
（４）に吊るした錘（３）の位置は変わることがない。
尚、錘（３）の取り付け部位からＶ字形に二本の糸を張
設して、錘（３）の振れ軌道を安定させることも出来る
が、この場合、糸挿通板（10）に設けた条溝（９）に二
本の糸を挿通させることにより、錘（３）側に近づくに
つれて漸次狭くなるＶ字形の開き巾の変化によっても糸
（４）に外力を付与させることのない構造となる。In addition, an insertion hole or a groove (9) is provided on the upper part of the protractor plate (7).
Since the thread insertion plate (10) provided with the protrusion is provided, and the hanging fixing plate (5) for suspending the thread (4) is provided above the scale plate (2), the fixing plate (5) Fix the upper part of the thread (4) of appropriate length, then insert the thread (4) into the insertion hole or the groove (9), and attach the weight (3) to the tip of the thread (4). The thread (4) and the weight (3) perform a pendulum movement around the thread insertion plate (10) or the thread groove (9), and the thread insertion hole provided in the thread insertion plate (10). Alternatively, since the groove (9) serves as a fixing point for the thread (4) and the protractor plate (7) is vertically movable on the slide rail (6) as described above, the protractor plate (7) moves up and down. The thread insertion plate (10) which does not exist also moves up and down, and the fixing point of the thread (4) can be changed arbitrarily, and the length of the thread (4) can be freely adjusted. In this case, the yarn (4) does not receive an external force due to the vertical movement of the protractor plate (7), and therefore the position of the weight (3) suspended on the yarn (4) does not change.
It should be noted that it is possible to stretch two threads in a V shape from the attachment portion of the weight (3) to stabilize the swing trajectory of the weight (3), but in this case, it is provided on the thread insertion plate (10). By inserting two threads through the groove (9), an external force is not applied to the thread (4) even when the opening width of the V-shape is gradually narrowed toward the weight (3) side. Become.
また、糸挿通板（10）に糸（４）を挿通させて錘（３）
を取り付けた時に、張った糸（４）が分度器板（７）の
０度線に適合し又糸（４）の固定点が分度器板（７）の
中心に適合する様に、糸挿通板（10）を分度器板（７）
に突設することにより、分度器板（７）の上下動によっ
て糸（４）の固定点が変動する如何なる位置に於いて
も、糸（４）の振れ角度が分度器板（７）により測定し
得るものとなる。In addition, the thread (4) is inserted through the thread insertion plate (10) and the weight (3) is inserted.
So that the stretched thread (4) fits the 0-degree line of the protractor plate (7) and the fixing point of the thread (4) fits the center of the protractor plate (7) when the is attached. 10) Protractor plate (7)
When the protractor plate (7) is moved up and down, the deflection angle of the yarn (4) can be measured by the protractor plate (7) at any position where the fixed point of the yarn (4) changes due to the vertical movement of the protractor plate (7). Will be things.
［実施例］ 以下、本考案を一実施例によって具体的に説明する。[Embodiment] Hereinafter, the present invention will be described in detail with reference to an embodiment.
第１図及び第２図に示す如く、方形の板材からなる台座
（１）上に縦長台形状の目盛り板（２）を垂設する。目
盛り板（２）の上部には、先端に錘（３）を取り付けた
糸（４）を懸吊する吊り下げ固定板（５）を90度の各度
をもって突設する。吊り下げ固定板（５）は第４図に示
す如く、断面Ｌ字形杆（5a）と押え板（5b）とからな
り、断面Ｌ字形杆（5a）には底面の二箇所に糸挿通孔
（5c）を穿設しており、適宜の長さの糸（４）の両端を
上方より挿通し、その略中央を押え板（5b）で挾持した
後、蝶螺子等で固定するものである。また、目盛り板
（２）の前面における縦中央ラインには、これに沿って
断面コ字形のスライドレール（６）を付設しており、当
該スライドレール（６）の左側には1cm毎に測定可能な
目盛が印刷，テープの接着等の手段で表示している。As shown in FIGS. 1 and 2, a vertically long trapezoidal scale plate (2) is vertically installed on a pedestal (1) made of a rectangular plate material. On the upper part of the scale plate (2), a suspension fixing plate (5) for suspending a thread (4) having a weight (3) attached to the tip thereof is projected at 90 degrees. As shown in FIG. 4, the suspension fixing plate (5) is composed of an L-shaped rod (5a) in cross section and a holding plate (5b). The L-shaped rod (5a) in cross section has thread insertion holes ( 5c) is provided, both ends of a thread (4) of an appropriate length is inserted from above, and the approximate center of the thread (4) is held by a holding plate (5b), and then fixed with a wing screw or the like. The vertical center line on the front side of the scale plate (2) is provided with a slide rail (6) with a U-shaped cross section along the line, and on the left side of the slide rail (6), it is possible to measure every 1 cm. The graduations are indicated by means such as printing and tape bonding.
分度器板（７）には、180度の半円分度器を用い、中央
を０度線としており、左右両側に90度分の角度目盛が表
示してある。分度器板（７）の裏側縦中央部には、断面
コ字形の係合部材（８）が設けてあり、当該係合部材
（８）の対峙する側板は内方に湾曲形成しており、又第
３図に示す如く、係合部材（８）の両側には振り子運動
による分度器板（７）の振れを防止する角材（11）が固
定してある。尚、係合部材（８）をスライドレール
（６）に跨座させた係合状態が良好である場合には、特
段に振れ防止のための角材（11）は必要としないもので
ある。更に、分度器板（７）の中央上部には、条溝
（９）を設けた糸挿通板（10）を90度角をもって突設し
ている。この場合、条溝（９）の仮想延長ラインは分度
器板（７）の90度ラインの中心部（分度器板（７）の角
度の中心）に水平方向で直交するものとなる。The protractor plate (7) uses a 180 degree semi-circular protractor, the center of which is a 0 degree line, and angular scales of 90 degrees are displayed on both left and right sides. An engaging member (8) having a U-shaped cross section is provided in the longitudinal central portion on the back side of the protractor plate (7), and the side plates facing the engaging member (8) are curved inward. As shown in FIG. 3, square members (11) are fixed on both sides of the engaging member (8) to prevent the protractor plate (7) from swinging due to pendulum motion. If the engagement state in which the engagement member (8) is seated on the slide rail (6) is good, the square bar (11) for preventing the shake is not particularly required. Further, a thread insertion plate (10) provided with a groove (9) is provided at an upper portion of the center of the protractor plate (7) at an angle of 90 degrees. In this case, the virtual extension line of the groove (9) is perpendicular to the center of the 90 degree line of the protractor plate (7) (the center of the angle of the protractor plate (7)) in the horizontal direction.
使用状態について説明すると、第１図乃至第３図に示す
如く、分度器板（７）の裏方に設けた断面コ字形の係合
部材（８）をスライドレール（６）に跨座させて係合
し、分度器板（７）をスライドレール（６）に沿って垂
直方向に上下動自在にしておく。次いで、吊り下げ固定
板（５）の糸挿通孔（5c）に糸（４）をその両端から挿
通させ、更に、吊り下げ固定板（５）の下方に位置する
糸挿通板（10）の条溝（９）に挿通して、当該糸（４）
の両端を合わせてローレット螺子を取り付け、球状の錘
（３）を当該螺子により固定し、台座（１）上に表示し
た直交線の中心の上方に錘（３）の中心が位置する様に
位置合わせをし乍ら、吊り下げ固定板（５）により糸
（４）を固定する。一方、台座（１）と同一の肉厚を有
し、横レール（12）を固定したレール固定板（13）を、
台座（１）に隣接させ、軌道上に最下点に位置する錘
（３）に接する様にして、移動角材（14）を横レール
（12）内に載置しておき、分度器板（７）を上下動して
糸（４）の長さを変え乍ら、錘（３）を様々の振れ幅を
もって移動角材（14）に当て、移動角材（14）の移動距
離を測定する等して、理科，物理の実験に供する。The use state will be described. As shown in FIGS. 1 to 3, an engaging member (8) having a U-shaped cross section provided on the back side of the protractor plate (7) is laid over the slide rail (6) and engaged. Then, the protractor plate (7) is vertically movable along the slide rail (6). Then, the thread (4) is inserted into the thread insertion hole (5c) of the suspension fixing plate (5) from both ends thereof, and the thread insertion plate (10) positioned below the suspension fixing plate (5) is provided. Insert the thread (4) into the groove (9).
Install the knurled screw by aligning both ends of the, and fix the spherical weight (3) with the screw so that the center of the weight (3) is located above the center of the orthogonal line displayed on the pedestal (1). Then, the thread (4) is fixed by the suspension fixing plate (5). On the other hand, a rail fixing plate (13) having the same wall thickness as the pedestal (1) and having the horizontal rail (12) fixed,
The moving square (14) is placed in the horizontal rail (12) so that it is adjacent to the pedestal (1) and in contact with the weight (3) located at the lowest point on the track, and the protractor plate (7) is placed. ) Is moved up and down to change the length of the thread (4), the weight (3) is applied to the moving angle bar (14) with various swing widths, and the moving distance of the moving angle bar (14) is measured. , For science and physics experiments.
［考案の効果］ 以上の構成を採用する本考案によれば以下の効果を奏す
る。[Advantages of the Invention] According to the present invention having the above configuration, the following effects are obtained.
分度器板（７）はスライドレール（６）上で上下動自在
となることから、分度器板（７）に突設した糸挿通板
（10）も上下動して糸（４）の固定点の高さがそれに伴
ない変わることにより、錘（３）の上下左右の位置に変
更を来たすことなく、糸（４）の長さを簡易迅速に変更
することが出来るものとなり、更に、糸（４）の長さを
変更した場合においても、振り子の回動中心部となる糸
（４）の固定点に、常に分度器板（７）の中心を位置さ
せることが出来るものとなって錘（３）の振れ角度の測
定が極めて容易となるものであり、単振り子の様々な実
験に用いる際に極めて利便性を有する振り子実験装置を
提供し得るものとなる。Since the protractor plate (7) can move up and down on the slide rail (6), the thread insertion plate (10) protruding from the protractor plate (7) also moves up and down to raise the height of the fixing point of the thread (4). The length of the thread (4) can be easily and quickly changed without changing the positions of the weight (3) in the vertical and horizontal directions by changing the size of the thread (4). Even when the length of the pendulum is changed, the center of the protractor plate (7) can always be located at the fixed point of the thread (4) which is the center of rotation of the pendulum, and the weight (3) The swing angle can be measured very easily, and a pendulum experimental device that is extremely convenient when used in various experiments with a single pendulum can be provided.
第１図は本考案の使用状態を示した斜視図、第２図は本
考案の側面図、第３図は分度器板の取り付け構造を示す
断面図、第４図は吊り下げ固定板の構成を示す断面図で
ある。 （１）……台座 （２）……目盛り板 （３）……錘 （４）……糸 （５）……吊り下げ固定板 （６）……スライドレール （７）……分度器板 （８）……係合部材 （９）……挿通孔又は条溝 （10）……糸挿通板 （11）……角材 （12）……レール固定板 （13）……横レール （14）……移動角材FIG. 1 is a perspective view showing a use state of the present invention, FIG. 2 is a side view of the present invention, FIG. 3 is a sectional view showing a mounting structure of a protractor plate, and FIG. 4 is a structure of a suspension fixing plate. It is sectional drawing shown. (1) ...... Pedestal (2) ...... Scale plate (3) ...... Weight (4) ...... Thread (5) ...... Suspended fixing plate (6) ...... Slide rail (7) ...... Protractor plate (8) ) …… Engagement member (9) …… Insertion hole or groove (10) …… Thread insertion plate (11) …… Square bar (12) …… Rail fixing plate (13) …… Side rail (14) …… Moving timber
Claims (1)
と、この目盛り板（２）の上部に固定された吊り下げ固
定板（５）と、この吊り下げ固定板（５）に懸吊される
と共に先端に錘（３）が取り付けられた糸（４）と、前
記目盛り板（２）の前面中央に付設されたスライドレー
ル（６）と、このスライドレール（６）に跨座された係
合部材（８）を介してスライドレール（６）に沿って垂
直方向に上下動自在とされる分度器板（７）と、この分
度器板（７）の中央上部に突設される糸挿通板（10）
と、この糸挿通板（10）に設けられ前記糸（４）の中間
部が挿通される挿通孔又は条溝（９）と、を有してなる
ことを特徴とする振り子実験装置。1. A scale plate (2) suspended from a pedestal (1).
A suspension fixing plate (5) fixed to the upper part of the scale plate (2), and a thread (4) suspended from the suspension fixing plate (5) and having a weight (3) attached to the tip thereof. ), A slide rail (6) attached to the center of the front surface of the scale plate (2), and an engaging member (8) straddling the slide rail (6), along the slide rail (6). And a thread insertion plate (10) protruding from the upper center of the protractor plate (7).
A pendulum test device comprising: a thread insertion plate (10); and an insertion hole or a groove (9) through which an intermediate portion of the thread (4) is inserted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990071748U JPH0749503Y2 (en) | 1990-07-05 | 1990-07-05 | Pendulum test equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990071748U JPH0749503Y2 (en) | 1990-07-05 | 1990-07-05 | Pendulum test equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0431173U JPH0431173U (en) | 1992-03-12 |
| JPH0749503Y2 true JPH0749503Y2 (en) | 1995-11-13 |
Family
ID=31609061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990071748U Expired - Fee Related JPH0749503Y2 (en) | 1990-07-05 | 1990-07-05 | Pendulum test equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0749503Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5323391B2 (en) * | 2008-05-09 | 2013-10-23 | 鹿島建設株式会社 | Vibration suppression device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5545406U (en) * | 1978-09-14 | 1980-03-25 | ||
| JPS567967U (en) * | 1979-06-28 | 1981-01-23 | ||
| JPS60189070U (en) * | 1984-05-25 | 1985-12-14 | 西松 正武 | Energy conservation law experiment device |
-
1990
- 1990-07-05 JP JP1990071748U patent/JPH0749503Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0431173U (en) | 1992-03-12 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |