JP2677809B2 - Saw blade - Google Patents
Saw bladeInfo
- Publication number
- JP2677809B2 JP2677809B2 JP63000615A JP61588A JP2677809B2 JP 2677809 B2 JP2677809 B2 JP 2677809B2 JP 63000615 A JP63000615 A JP 63000615A JP 61588 A JP61588 A JP 61588A JP 2677809 B2 JP2677809 B2 JP 2677809B2
- Authority
- JP
- Japan
- Prior art keywords
- tooth
- teeth
- tip
- saw blade
- straight
- 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.)
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- Drilling Tools (AREA)
Description
【発明の詳細な説明】 [発明の目的] (産業上の利用分野) 本発明は鋸刃に係り、さらに詳細には、例えば帯鋸、
丸鋸あるいはハクソーのごとき鋸刃に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a saw blade, and more specifically, for example, a band saw,
It relates to saw blades such as circular saws or saws.
(従来の技術) 従来、例えば金属性の大きなワークピースを切断(切
削)する装置として帯鋸盤が使用されている。(Prior Art) Conventionally, for example, a band saw machine is used as a device for cutting (cutting) a workpiece having a large metal property.
帯鋸盤に使用される帯鋸刃においては、切粉のスムー
ズな排出と、直進性維持のため鋸刃にあさり出しが行な
われ、このあさり出し作業は、あさりを付けない歯、す
なわち直歯に対してあさり打ち出し量を数値で規定して
ある。In the band saw blade used in the band saw machine, the saw blade is squeezed out in order to smoothly discharge chips and maintain straightness. The amount of hammering is specified numerically.
例えば第5図に示すごとく、鋸刃101の各歯(右あさ
り歯103R、左あさり歯105L、直歯107S)の切れ歯で作る
幅方向の線分a1〜a5は、所定の数値で均等にあさり出し
されている。For example, as shown in FIG. 5, line segments a 1 to a 5 in the width direction formed by the teeth of each tooth of the saw blade 101 (right tooth 103R, left tooth 105L, straight tooth 107S) are given numerical values. It is evenly exposed.
なぜならば、一歯に大きな切削抵抗をかけないよう切
削作用を分散させ、安定した高速重切削が行なわれるよ
う構成されている。This is because the cutting action is dispersed so that a large cutting resistance is not applied to one tooth, and stable high-speed heavy cutting is performed.
(発明が解決しようとする課題) 上述のごとく、各歯が交差してなす幅方向の線分a1〜
a5が設定可能であるが、しかし、鋸刃は使用に応じて摩
耗し形状を長期に維持することはできない。(Problems to be Solved by the Invention) As described above, the widthwise line segment a 1 to
a 5 can be set, but, the saw blade can not be maintained in long-term wear and shapes depending on the use.
すなわち、第6図に示すごとく、直歯107Sの摩耗量A
に対して左右のあさり歯103R、105Lの摩耗量Bを比較す
ると、直歯107Sの摩耗量Aが摩耗するにつれ、左右のあ
さり歯103R、105Lの摩耗量Bも摩耗が進行する。That is, as shown in FIG. 6, the wear amount A of the straight teeth 107S
On the other hand, comparing the wear amounts B of the left and right bevel teeth 103R and 105L, the wear amount B of the left and right bevel teeth 103R and 105L also progresses as the wear amount A of the straight teeth 107S wears.
摩耗が進行しAが完全に摩耗してしまうと、直歯107S
の線分a2およびa4は左右のあさり歯103R、105Lの線分a1
およびa5に吸収されるかたちとなり、直歯107Sと左右の
あさり歯103R、105Lの切削抵抗の分散が均一でなくな
る。When wear progresses and A wears completely, straight teeth 107S
Of the line segment a 2 and a 4 are left and right set teeth 103R, 105L of the line segment a 1
And a 5 are absorbed, and the distribution of cutting resistance between the straight teeth 107S and the left and right flank teeth 103R and 105L is not uniform.
このため、左右のあさり歯103R、105Lの方が直歯107S
より抵抗が上廻り、更に第5図に示す分散切削を可能と
する直歯107Sの有効高さbがなくなるため切粉幅の分断
が不可能となる。Therefore, the right and left set teeth 103R and 105L are straight teeth 107S.
Since the resistance is further increased and the effective height b of the straight teeth 107S which enables the distributed cutting shown in FIG. 5 is eliminated, it becomes impossible to divide the chip width.
このことは、鋸刃切断が溝切り切断であることを考え
ると、有効ガレット面積を一定とするならば、直歯107
S、左右のあさり歯103R、105Lによる切粉の分断作用が
なくなり、鋸帯厚そのものの切粉幅となる。Considering that the saw blade cutting is groove cutting, if the effective gullet area is constant, the straight teeth 107
S, the cutting action of the cutting chips by the right and left teeth 103R and 105L is eliminated, and the cutting width becomes the saw band thickness itself.
このため、切削切粉の体積が増し高速重切削時におい
ては、安定した切粉の排出が困難となるという問題があ
る。For this reason, there is a problem that the volume of cutting chips increases and it becomes difficult to stably discharge chips during high-speed heavy cutting.
そこでこの発明は、上述した課題に鑑み創案されたも
のであって、鋸刃の摩耗が進行してもより長時間切削抵
抗の分散、スムーズな切粉の排出を維持し、安定した高
速重切削が行なえるあさり形状を備えた鋸刃の提供を目
的とする。Therefore, the present invention has been devised in view of the above-mentioned problems, and maintains stable dispersion of cutting resistance for a longer period of time even if the wear of the saw blade progresses, smooth chip discharge, and stable high-speed heavy cutting. The purpose of the present invention is to provide a saw blade having a clam shape that can be performed by.
[発明の構成] (課題を解決するための手段) 前述のごとき従来の問題に鑑みて、本発明は、鋸刃の
走行方向にみて左右方向に屈曲を行わない直歯と右方向
への屈曲を行った右あさり歯と左方向への屈曲を行った
左あさり歯とを備え、前記直歯の第1の歯先線に対して
左右のあさり歯の第2の歯先線を、第2の歯先線の外側
が前記第1の歯先線かな遠ざかり、かつ左右のあさり歯
の基部に近くなるように傾斜してなり、前記右あさり歯
の歯先の左角部よりも左あさり歯の歯先の右角部を右側
に配置した構成の鋸刃において、左右のあさり歯の歯先
部を、屈曲後の傾き角度がより大きくなるように予め傾
斜して設け、鋸刃の走行方向から見て前記第1の歯先線
と屈曲後の左右のあさり歯の第2の歯先線とのなす傾き
角度を15°以上に設け、かつ鋸刃の走行方向から見て前
記第1の歯先線と第2の歯先線との交差位置から前記直
歯の第1の歯先線までの有効高さを0.05mm以上に設けて
なるものである。[Structure of the Invention] (Means for Solving the Problems) In view of the conventional problems as described above, the present invention is directed to straight teeth that do not bend in the left-right direction as viewed in the traveling direction of the saw blade and bending to the right. The right crest tooth and the left crest tooth that is bent in the left direction, and the second tip lines of the left and right crest teeth with respect to the first tip line of the straight tooth The outer side of the tooth tip line of the right tip tooth line is distant from the first tip tip line and is inclined so as to be close to the bases of the left and right set teeth, and the left set tooth is more than the left corner section of the tip of the right set tooth. In a saw blade having a configuration in which the right corner portion of the tooth tip of is arranged on the right side, the tooth tip portions of the left and right set teeth are provided with a pre-inclination so that the tilt angle after bending becomes larger, and from the traveling direction of the saw blade. As seen, the inclination angle formed between the first tooth tip line and the second tooth tip lines of the left and right crest teeth after bending is set to 15 ° or more, and The effective height from the intersecting position of the first tip line and the second tip line to the first tip line of the straight tooth is 0.05 mm or more when viewed from the running direction of the blade. Is.
(実施例) 以下、本発明の一実施例を図面に基づいて詳細に説明
する。Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
実施例は帯鋸刃の場合について例示するけれども、本
発明は帯鋸刃に限ることなく、丸鋸刃あるいはハクソー
など種々の鋸刃に実施が可能である。Although the embodiments exemplify the case of a band saw blade, the present invention is not limited to the band saw blade, and can be implemented in various saw blades such as a circular saw blade and a saw blade.
まず、鋸刃の各部の名称について第4図(a)〜
(c)をもとに説明する。First, the names of each part of the saw blade are shown in FIG.
An explanation will be given based on (c).
鋸刃1は、基本的にワークピースの切断(切削)を行
なうときに、ワークピースに対する切込み方向(図示の
矢印X方向)に対し直交する方向(図示の矢印Y方向)
に走行する。The saw blade 1 is, when basically cutting (cutting) a workpiece, a direction (arrow Y direction shown) orthogonal to a cutting direction (arrow X direction shown) with respect to the workpiece.
To travel.
そして、ワークピースの切断(切削)を行なう右方向
への屈曲を行なった右あさり歯3R、左方向への屈曲を行
なった左あさり歯5L、および左右方向への屈曲を行なわ
ない直歯7Sとで1グループになっている。なお、第1図
(a)の図中、斜線で示す部分は有効ガレット部9を示
す。Then, the right bevel tooth 3R is bent to the right to cut (cut) the workpiece, the left bevel tooth 5L is bent to the left, and the straight tooth 7S is not bent to the left and right. It is one group. In addition, in the drawing of FIG. 1 (a), the hatched portion indicates the effective gullet portion 9.
なお更に、上述した左右あさり歯3R、5Lおよび直歯7S
の組合せを変えて任意に組合せても良いことは勿論であ
る。Still further, the above-mentioned left and right set teeth 3R, 5L and straight teeth 7S
It is needless to say that the combination may be changed to be arbitrarily combined.
第1図乃至第3図を参照するに、鋸刃1の各歯(右あ
さり歯3R、左あさり歯5L、直歯7S)のコーナーで作る幅
方向の線分L1〜L5は、所定の数値で均等に設けられてい
る。With reference to FIG. 1 to FIG. 3, line segments L 1 to L 5 in the width direction made at the corners of each tooth of the saw blade 1 (right tooth 3R, left tooth 5L, straight tooth 7S) are predetermined. The numbers are evenly set.
更に、右あさり歯3R、左あさり歯5Lの歯線と直歯7Sの
歯先線との傾き角度θ1を15度以上とし、かつ直歯7Sの
有効高さHの量を0.05mm以上として鋸刃1を構成した。Furthermore, the inclination angle θ 1 between the tooth line of the right tooth 3R and the left tooth 5L and the tip line of the straight tooth 7S is set to 15 degrees or more, and the effective height H of the straight tooth 7S is set to 0.05 mm or more. The saw blade 1 was constructed.
このことにより、摩耗が進行しても、より長時間切削
切粉の分散ができ、スムーズな切粉の排出を行なわせ、
安定した高速重切削を営むことができる。As a result, even if the wear progresses, the cutting chips can be dispersed for a longer time, and the chips can be discharged smoothly.
It is possible to carry out stable high-speed heavy cutting.
なお参考までに、従来の鋸刃にあっては各あさり歯の
歯線傾き角度θは8〜10度であり、直歯の有効高さHは
0.02〜0.05mmが一般的である。For reference, in the conventional saw blade, the tooth line inclination angle θ of each set tooth is 8 to 10 degrees, and the effective height H of the straight tooth is
0.02 to 0.05 mm is common.
このような鋸刃の加工手段としては、第2図に示すご
とく、あさり加工前にあらかじめ直歯7Sを除き、右あさ
り歯3R、左あさり歯5Lとなる歯に、左右方向に屈曲した
ときに傾き角度がより大きくなるように外方に向けて傾
斜した所定の傾き角度θ2を付けて仕上げておく。As shown in FIG. 2, as a processing means of such a saw blade, when the right tooth 3R and the left tooth 5L are bent in the left-right direction, the straight teeth 7S are removed in advance before the grinding. Finish with a predetermined inclination angle θ 2 that is inclined outward so that the inclination angle becomes larger.
この傾き角度θ2の量は、あさりの正規打ち出し量を
加工することにより、各あさり歯3R、5Lの歯線傾き角度
θ1は15度以上とし、分散切削を可能とする直歯7Sの有
効高さを0.05mm以上となるような値に加工する。The amount of this inclination angle θ 2 is the tooth line inclination angle θ 1 of each crest tooth 3R, 5L, which is 15 degrees or more by processing the normal amount of clam, and the effective of the straight tooth 7S that enables distributed cutting. The height is processed to a value of 0.05 mm or more.
次に、あさり加工後に右あさり歯3R、左あさり歯5Lの
みを第1図に示すごとく歯線傾き角度θ1が15度以上と
なるようにあさり打ち出しを行ない、分散切削を可能と
する直歯7Sの有効高さHを0.05mm以上に鋸刃歯形二番面
11(第3図参照)を研磨等で仕上げる。Next, as shown in FIG. 1, only the right and left teeth 3R and 5L after the grinding are punched out so that the tooth line inclination angle θ 1 is 15 degrees or more, and the straight teeth that enable distributed cutting. The effective height H of 7S is 0.05mm or more.
Finish 11 (see Fig. 3) by polishing.
この時のあさり加工のあさり打ち出し量は、あさり歯
の歯線傾き角度θ1が15度以上、分散切削を可能とする
直歯の有効高さHが0.05mm以上に加工されたのちで、正
規の打ち出し量が得られるような値に加工を行なってお
く。At this time, the amount of clam punching in the clam machining is normal after the tooth line inclination angle θ 1 of the clam teeth is 15 degrees or more and the effective height H of the straight teeth that enables distributed cutting is 0.05 mm or more. The processing is performed to a value such that the ejection amount can be obtained.
なお、各歯(右あさり歯3R、左あさり歯5L、直歯7S)
が交差してなす幅方向の線分L1〜L5は、所定の数値で均
等に配分加工されていることは勿論である。また、第3
図に示す符号13は、掬い面を表わす。Each tooth (right crest 3R, left crest 5L, straight tooth 7S)
It is needless to say that the width-direction line segments L 1 to L 5 which are formed by intersecting with each other are equally distributed by a predetermined numerical value. Also, the third
Reference numeral 13 shown in the figure represents a scooping surface.
上述のごとき加工手段により、分散切削を可能とする
直歯7Sの有効高さHの値を、現状0.02〜0.05mmのものを
0.05mm以上に大きくすることにより、摩耗が進行して
も、より長時間切削抵抗の分散およびスムーズな切粉の
排出を維持し、安定した高速重切削が可能となる。The value of the effective height H of the straight teeth 7S that enables distributed cutting by the above-mentioned machining means is currently 0.02 to 0.05 mm.
By increasing the thickness to 0.05 mm or more, even if wear progresses, dispersion of cutting resistance and smooth discharge of cutting chips can be maintained for a long time, and stable high-speed heavy cutting can be performed.
なお、上述した実施例に限定されることなく、本発明
の要旨を逸脱しない範囲において種々変更を加え得るこ
とは勿論である。It is needless to say that the present invention is not limited to the above-described embodiments, and that various changes can be made without departing from the scope of the present invention.
[発明の効果] 以上のごとき実施例の説明より理解されるように、要
するに本発明は、鋸刃の走行方向にみて左右方向に屈曲
を行わない直歯(7S)と右方向への屈曲を行った右あさ
り歯(3R)と左方向への屈曲を行った左あさり歯(5L)
とを備え、前記直歯(7S)の第1の歯先線に対して左右
のあさり歯(3R、5L)の第2の歯先線を、第2の歯先線
の外側が前記第1の歯先線かな遠ざかり、かつ左右のあ
さり歯の基部に近くなるように傾斜してなり、前記右あ
さり歯(3R)の歯先の左角部よりも左あさり歯(5L)の
歯先の右角部を右側に配置した構成の鋸刃において、左
右のあさり歯(3R、5L)の歯先部を、屈曲後の傾き角度
がより大きくなるように予め傾斜して設け、鋸刃の走行
方向から見て前記第1の歯先線と屈曲後の左右のあさり
歯(3R,5L)の第2の歯先線とのなす傾き角度(θ1)を
15°以上に設け、かつ鋸刃の走行方向から見て前記第1
の歯先線と第2の歯先線との交差位置から前記直歯(7
S)の第1の歯先線までの有効高さ(H)を0.05mm以上
に設けてなるものである。[Effects of the Invention] As will be understood from the above description of the embodiments, in short, the present invention provides straight teeth (7S) that do not bend in the left-right direction as viewed in the traveling direction of the saw blade and bending in the right direction. Right crest (3R) and left crest (5L) bent left
And a second tooth tip line of the left and right set teeth (3R, 5L) with respect to a first tooth tip line of the straight tooth (7S), and an outside of the second tooth tip line is the first tooth tip line. The tip line of the left crest tooth (5L) is more inclined than the left corner of the tip of the right crest tooth (3R). In a saw blade with the right corner arranged on the right side, the tooth tips of the left and right teeth (3R, 5L) are pre-inclined so that the tilt angle after bending is larger, and the running direction of the saw blade As seen from the above, the inclination angle (θ 1 ) formed by the first tooth tip line and the second tooth tip lines of the left and right crest teeth (3R, 5L) after bending is
It is provided at an angle of 15 ° or more, and when viewed from the traveling direction of the saw blade, the first
From the crossing position of the tooth tip line of the second tooth tip line and the straight tooth (7
The effective height (H) of S) up to the first tooth tip line is set to 0.05 mm or more.
上記構成より明らかなように、本発明においては、直
歯7Sの歯先線に対する左右のあさり歯3R,5Lの歯先線の
なす傾斜角度θ1は15°以上に設けてあり、かつ直歯7S
の有効高さHを0.05mm以上に設けてあるから、上記傾斜
角度θ1および有効高さHは従来の鋸刃のそれらよりも
大きな値であり、直歯7S及び左右のあさり歯3R,5Lの歯
先部が磨耗した場合であっても、前記有効高さHがほぼ
零に近くなるまでの寿命が長くなるものであり、各歯に
対する切削抵抗の分散および切粉の細分化を長時間に亘
って維持できるものである。As is apparent from the above configuration, in the present invention, the inclination angle θ 1 formed by the tip lines of the right and left crust teeth 3R and 5L with respect to the tip line of the straight tooth 7S is set to 15 ° or more, and the straight tooth 7S
Since the effective height H of the above is set to 0.05 mm or more, the inclination angle θ 1 and the effective height H are larger than those of the conventional saw blade, and the straight teeth 7S and the left and right teeth 3R, 5L Even if the tooth tip of the tooth wears, the life until the effective height H becomes almost zero becomes long, and the dispersion of cutting resistance and the fragmentation of cutting chips for each tooth are prolonged. It can be maintained for a long time.
特に本発明においては、左右のあさり歯の歯先部は、屈
曲後の傾き角度がより大きくなるように予め傾斜してあ
るから、前述したように傾斜角度θ1を15°以上に形成
した場合であっても、左右のあさり歯3R,5Lの内側の角
度が互の角度の外側に位置するようなことがなく、金属
切削用の鋸刃として好都合な構成である。In particular, in the present invention, since the tooth tips of the left and right bevel teeth are pre-inclined so that the inclination angle after bending becomes larger, as described above, when the inclination angle θ 1 is formed to be 15 ° or more. However, the inner angles of the left and right set teeth 3R and 5L do not lie outside each other, which is a convenient construction for a saw blade for metal cutting.
第1図乃至第3図は本発明が適用された一実施例を示す
鋸刃で、第1図は鋸刃の断面図、第2図(a)、(b)
は左右のあさり歯の歯先傾斜を示す説明図、第3図は歯
先の斜視説明図である。 第4図は鋸刃各部の名称説明図であり、第4図(a)は
正面図、第4図(b)は第4図(a)の平面図、第4図
(c)は第4図(b)におけるC−C線に沿った断面図
である。 第5図および第6図は従来例を示す鋸刃の断面説明図で
ある。 [図面の主要な部分を表わす符号の説明] 1…鋸刃 3R…右あさり歯 5L…左あさり歯 7S…直歯 L1〜L5…幅方向の線分 θ1…歯線傾き角度 H…直歯の有効高さ1 to 3 are saw blades showing an embodiment to which the present invention is applied. FIG. 1 is a sectional view of the saw blades, and FIGS. 2 (a) and 2 (b).
Is an explanatory view showing the tip inclination of the left and right set teeth, and FIG. 3 is a perspective explanatory view of the tip. FIG. 4 is an explanatory view of names of respective parts of the saw blade. FIG. 4 (a) is a front view, FIG. 4 (b) is a plan view of FIG. 4 (a), and FIG. 4 (c) is a fourth view. It is sectional drawing along the CC line in FIG. FIG. 5 and FIG. 6 are cross-sectional explanatory views of a saw blade showing a conventional example. [Description of codes representing the major part of the drawing] 1 ... saw blade 3R ... right set tooth 5L ... left set tooth 7S ... straight teeth L 1 ~L 5 ... width direction of the line segment theta 1 ... tooth line tilt angle H ... Effective height of straight teeth
Claims (1)
わない直歯(7S)と右方向への屈曲を行った右あさり歯
(3R)と左方向への屈曲を行った左あさり歯(5L)とを
備え、前記直歯(7S)の第1の歯先線に対して左右のあ
さり歯(3R,5L)の第2の歯先線を、第2の歯先線の外
側が前記第1の歯先線かな遠ざかり、かつ左右のあさり
歯の基部に近くなるように傾斜してなり、前記右あさり
歯(3R)の歯先の左角部よりも左あさり歯(5L)の歯先
の右角部を右側に配置した構成の鋸刃において、左右の
あさり歯(3R,5L)の歯先部を、屈曲後の傾き角度がよ
り大きくなるように予め傾斜して設け、鋸刃の走行方向
から見て前記第1の歯先線と屈曲後の左右のあさり歯
(3R,5L)の第2の歯先線とのなす傾き角度(θ1)を15
°以上に設け、かつ鋸刃の走行方向から見て前記第1の
歯先線と第2の歯先線との交差位置から前記直歯(7S)
の第1の歯先線までの有効高さ(H)を0.05mm以上に設
けてなることを特徴とする鋸刃。1. A straight tooth (7S) that does not bend in the left-right direction as viewed in the traveling direction of the saw blade, a right crest tooth (3R) that bends to the right, and a left clam that bends to the left. With the tooth (5L), the second tooth tip line of the right and left set teeth (3R, 5L) with respect to the first tooth tip line of the straight tooth (7S) is located outside the second tooth tip line. Is inclined so that it is distant from the first tip tip line and is close to the bases of the left and right set teeth, and the left set tooth (5L) is located more than the left corner of the tip of the right set tooth (3R). In the saw blade with the right corner of the tooth tip of the right tooth arranged on the right side, the tooth tips of the left and right teeth (3R, 5L) are pre-inclined so that the tilt angle after bending is larger, When viewed from the running direction of the blade, the inclination angle (θ 1 ) formed by the first tip line and the second tip lines of the left and right crest teeth (3R, 5L) after bending is 15
The straight tooth (7S) is provided at an angle equal to or more than 0 °
A saw blade having an effective height (H) up to the first tooth tip line of 0.05 mm or more.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63000615A JP2677809B2 (en) | 1988-01-07 | 1988-01-07 | Saw blade |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63000615A JP2677809B2 (en) | 1988-01-07 | 1988-01-07 | Saw blade |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH01177914A JPH01177914A (en) | 1989-07-14 |
JP2677809B2 true JP2677809B2 (en) | 1997-11-17 |
Family
ID=11478636
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63000615A Expired - Fee Related JP2677809B2 (en) | 1988-01-07 | 1988-01-07 | Saw blade |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2677809B2 (en) |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6056819A (en) * | 1983-09-08 | 1985-04-02 | Giken:Kk | Metal-machining band saw |
-
1988
- 1988-01-07 JP JP63000615A patent/JP2677809B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH01177914A (en) | 1989-07-14 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |