JPH07228940A - Tubular rhenium-molybdenum alloy parts - Google Patents
Tubular rhenium-molybdenum alloy partsInfo
- Publication number
- JPH07228940A JPH07228940A JP1840994A JP1840994A JPH07228940A JP H07228940 A JPH07228940 A JP H07228940A JP 1840994 A JP1840994 A JP 1840994A JP 1840994 A JP1840994 A JP 1840994A JP H07228940 A JPH07228940 A JP H07228940A
- Authority
- JP
- Japan
- Prior art keywords
- rhenium
- alloy
- molybdenum alloy
- tubular
- weight
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は，レニウム−モリブデン
合金管状部品とそれを用いた電子管用含浸型カソードに
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rhenium-molybdenum alloy tubular component and an impregnated cathode for an electron tube using the tubular component.
【０００２】[0002]
【従来の技術】一般に，陰極線管には，含浸型カソード
が用いられている。この種の含浸型カソードは，少なく
とも一端を開口した金属製スリーブ，即ち，管状部品，
を備え，この管状部品の他端に，含浸型の陰極基体が装
填されている。さらに，この管状部品に金属細線等から
なる支持体が溶着され，管状部品内に加熱用のコイルヒ
ータを挿入して含浸型カソードが構成されている（例え
ば，特開昭６４−１０５３９号公報の第３図及び第４図
参照，以下，従来技術１と呼ぶ）。2. Description of the Related Art Generally, an impregnated cathode is used in a cathode ray tube. This type of impregnated cathode is a metallic sleeve, or tubular part, with at least one end open.
And the impregnated cathode substrate is loaded on the other end of the tubular part. Further, a support made of a thin metal wire or the like is welded to this tubular part, and a coil heater for heating is inserted into the tubular part to form an impregnated cathode (for example, Japanese Patent Laid-Open No. 64-10539). See FIGS. 3 and 4, hereinafter referred to as Prior Art 1).
【０００３】ところで，ＨＤ−ＴＶやＥＤ−ＴＶ等の様
に，高輝度，高精細化が進み，これに用いられる電子管
用含浸型カソードは，高電流密度化が要求されている。
高電流密度化されるとこの種のカソードの動作温度は，
１０００℃近くまで，上昇するので，その円筒状，また
は，帽状の管状部品には，従来の酸化物カソードに使用
されているニクロム等の材料では，蒸発や熱収縮といっ
た不具合が生じる。これを防ぐために，管状部品にはモ
リブデン（Ｍｏ）等の高融点金属が使用されている。こ
のＭｏ材料は高温における機械的強度が高く，真空中で
の高温におけるガスの放出が少なく，また，水素雰囲気
中での熱処理で脆化しにくいという利点を有している。
そして，この種の円筒状のスリーブは，予め穿孔加工お
よび切削加工により管状としたものを管引き加工するこ
とにより製造されている。By the way, as in HD-TV, ED-TV, etc., high brightness and high definition are advanced, and impregnated cathodes for electron tubes used therein are required to have high current density.
When the current density is increased, the operating temperature of this type of cathode is
Since the temperature rises up to around 1000 ° C., the cylindrical or cap-shaped tubular part has problems such as evaporation and thermal contraction in the material such as nichrome used in the conventional oxide cathode. In order to prevent this, high melting point metals such as molybdenum (Mo) are used for the tubular parts. This Mo material has the advantages that it has high mechanical strength at high temperature, less gas is released at high temperature in vacuum, and that it is less likely to be embrittled by heat treatment in a hydrogen atmosphere.
The cylindrical sleeve of this type is manufactured by subjecting a tubular sleeve that has been previously drilled and cut to a pipe drawing process.
【０００４】しかし，Ｍｏは，再結晶後の強度が極端に
低く，そのため電気抵抗溶接が極めて困難であった。こ
の欠点を克服するために，従来技術１には，円筒状のス
リーブ又は帽状のスリーブを，レニウム含有率が５〜５
５重量％のレニウム・モリブデン（Ｒｅ−Ｍｏ）合金で
形成することが提案されている。However, Mo has an extremely low strength after recrystallization, so that electric resistance welding was extremely difficult. In order to overcome this drawback, in the prior art 1, a cylindrical sleeve or a cap-shaped sleeve having a rhenium content of 5 to 5 is used.
It has been proposed to form it with a 5 wt% rhenium molybdenum (Re-Mo) alloy.
【０００５】[0005]
【発明が解決しようとする課題】しかし，Ｒｅ−Ｍｏ合
金は，溶接されると当然再結晶を起こし，強度が著しく
低下する。特に，電子銃のカソードに使用される管状部
品は，肉厚が２０〜５０μｍと薄いために，圧環強度
（潰し強度）が低下すると，溶接時のクランプの力によ
り変形等が生じ，性能を著しく低下させる。また，その
ため，電気抵抗溶接（スポット溶接）が困難である。However, when the Re-Mo alloy is welded, recrystallization naturally occurs and the strength is remarkably reduced. In particular, since the tubular part used for the cathode of the electron gun has a thin wall thickness of 20 to 50 μm, when the radial crushing strength (crushing strength) is reduced, deformation is caused by the force of the clamp during welding, resulting in remarkable performance. Lower. Therefore, electric resistance welding (spot welding) is difficult.
【０００６】そこで，本発明の一つの技術的課題は，再
結晶後の靭性に優れた円筒状又は帽状スリーブからなる
レニウム−モリブデン合金管状部品を提供することにあ
る。Therefore, one technical object of the present invention is to provide a rhenium-molybdenum alloy tubular part comprising a cylindrical or cap-shaped sleeve having excellent toughness after recrystallization.
【０００７】また，本発明のもう一つの技術的課題は，
Ｗ，Ｍｏ，Ｔａ等の高融点金属からなる他の構成部材と
の溶接が良好なレニウム−モリブデン合金管状部品を提
供することにある。Further, another technical problem of the present invention is
An object of the present invention is to provide a rhenium-molybdenum alloy tubular part which is well welded to other constituent members made of a high melting point metal such as W, Mo and Ta.
【０００８】さらに，本発明の更にもう一つの技術的課
題は，上記レニウム−モリブデン合金管状部品を用いた
電子管用含浸型カソードを提供することにある。Still another technical object of the present invention is to provide an impregnated cathode for an electron tube using the above rhenium-molybdenum alloy tubular component.
【０００９】[0009]
【課題を解決するための手段】本発明者らは，上記課題
を解決するべく，鋭意検討した結果，レニウム−モリブ
デン合金管の再結晶後の圧環強度を高める添加物を発見
し，本発明を成すに至ったものである。Means for Solving the Problems The inventors of the present invention have made extensive studies in order to solve the above problems, and as a result, have found an additive that enhances the radial crushing strength after recrystallization of a rhenium-molybdenum alloy tube, and It has come to be done.
【００１０】本発明によれば，Ｒｅ−Ｍｏ合金からなる
少なくとも一端が開口した円筒状スリーブからなるレニ
ウム−モリブデン合金管状部品であって，前記Ｒｅ−Ｍ
ｏ合金は，Ｒｅ５〜９５重量％残部Ｍｏからなる合金
に，Ｓｉ，Ｆｅ，及びＷのうちの少なくとも一種を含
み，前記Ｓｉの添加量は，０．００１〜１．０重量％，
前記Ｆｅの添加量は，０．００１〜１．０重量％，及び
前記Ｗの添加量は，０．００５〜５．０重量％であるこ
とを特徴とするレニウム−モリブデン合金管状部品が得
られる。According to the present invention, there is provided a rhenium-molybdenum alloy tubular component comprising a cylindrical sleeve made of Re-Mo alloy and having at least one end opened, said Re-M
The o alloy contains at least one of Si, Fe, and W in an alloy composed of Re 5 to 95 wt% balance Mo, and the addition amount of Si is 0.001 to 1.0 wt%.
A rhenium-molybdenum alloy tubular part is obtained, wherein the Fe content is 0.001 to 1.0% by weight and the W content is 0.005 to 5.0% by weight. .
【００１１】本発明によれば，前記レニウム−モリブデ
ン合金管状部品において，前記Ｒｅ−Ｍｏ合金は，Ｓ
ｉ，Ｆｅ，及びＷを含み，前記Ｓｉの添加量は，０．０
０１〜１．０重量％，前記Ｆｅの添加量は，０．００１
〜１．０重量％，及び前記Ｗの添加量は，０．００５〜
５．０重量％であることを特徴とするレニウム−モリブ
デン合金管状部品が得られる。According to the present invention, in the rhenium-molybdenum alloy tubular component, the Re-Mo alloy is S
Including i, Fe, and W, the addition amount of Si is 0.0
01-1.0 wt%, the amount of Fe added is 0.001
~ 1.0 wt%, and the amount of W added is 0.005-
A rhenium-molybdenum alloy tubular part is obtained which is characterized by 5.0% by weight.
【００１２】本発明によれば，前記したいずれかのレニ
ウム−モリブデン合金管状部品において，前記合金管状
部品は再結晶後の圧環強度が１７０〜６００Ｎ／ｍｍ2
であることを特徴とするレニウム−モリブデン合金管状
部品が得られる。According to the present invention, in any of the above-mentioned rhenium-molybdenum alloy tubular parts, the alloy tubular part has a radial crushing strength after recrystallization of 170 to 600 N / mm 2.
A rhenium-molybdenum alloy tubular part is obtained.
【００１３】本発明によれば，前記いずれかのレニウム
−モリブデン合金管状部品を備えたことを特徴とする電
子管用含浸型カソードが得られる。According to the present invention, there is obtained an impregnated cathode for an electron tube, which is equipped with any of the above-mentioned rhenium-molybdenum alloy tubular parts.
【００１４】ここで，本発明において，Ｓｉ及びＦｅの
上記適量の添加は，Ｒｅ−Ｍｏ固溶体及びその粒界を強
化する。In the present invention, the addition of Si and Fe in appropriate amounts strengthens the Re-Mo solid solution and its grain boundaries.
【００１５】[0015]
【実施例】以下，本発明の実施例について説明する。EXAMPLES Examples of the present invention will be described below.
【００１６】（実施例１）平均粒径３μｍのＲｅ粉末
と，平均粒径３μｍのＭｏ粉末とを用意し，Ｖ型ミキサ
ーにて混合し，混合粉末（以後，Ａ粉末と呼ぶ）を得
た。Ａ粉末に酸またはアルカリ水溶液に溶かしたＳｉ，
Ｆｅ，Ｗを用意し，所定量をそれぞれドープし，乾燥
し，水素にて再還元して，各種重量％を変えたドープド
Ｒｅ−Ｍｏ粉末を作った。その後，金型プレスにて角棒
状の圧粉体を作り，仮焼結を行い，次いで直接通電に
て，各ドープ量の違ったインゴットを作った。その後，
転打を行い径（Ｄ）８．０ｍｍとし，ドリルでＤ６．０
ｍｍ の孔を開け，芯金を入れ，熱間線引を行い，外径
１．３ｍｍ，肉厚０．０３ｍｍのパイプを作り，２．２
ｍｍに切断し，芯金を取り除き，スリーブ，即ち，管状
部品を作った。その後，２０００℃×２０分の再結晶化
処理を行い，ＪＩＳ Ｚ ２５０７に基づいて圧環強度
を調べた。以下の表１乃至表４にその強度試験結果を示
した。尚，表中の各元素量は，全てパイプ状態での組成
を示している。Example 1 Re powder having an average particle size of 3 μm and Mo powder having an average particle size of 3 μm were prepared and mixed with a V-type mixer to obtain a mixed powder (hereinafter referred to as A powder). . Si dissolved in acid or alkaline solution in A powder,
Fe and W were prepared, and each of them was doped with a predetermined amount, dried, and re-reduced with hydrogen to prepare a doped Re-Mo powder having various weight percentages. After that, square rod-shaped green compacts were made with a die press, pre-sintered, and then directly energized to make ingots with different dope amounts. afterwards,
Rolled to a diameter (D) of 8.0 mm and drilled to D6.0
Open a mm hole, insert a core bar, and perform hot drawing to make a pipe with an outer diameter of 1.3 mm and a wall thickness of 0.03 mm.
It was cut into mm and the core metal was removed to make a sleeve, that is, a tubular part. After that, recrystallization treatment was performed at 2000 ° C. for 20 minutes, and the radial crushing strength was examined based on JIS Z 2507. The strength test results are shown in Tables 1 to 4 below. The amounts of each element in the table all indicate the composition in the pipe state.
【００１７】[0017]
【表１】 [Table 1]
【００１８】上記表１に示すように，Ｓｉを０．００１
０〜１．０００重量％添加した実施例１に係るスリーブ
では，再結晶後の圧環強度は２００Ｎ／ｍｍ2 以上であ
ったが，これよりも含有量の少ないか，もしくは，無添
加の比較例に係るスリーブでは，圧環強度は明らかに小
さかった。As shown in Table 1 above, the Si content is 0.001
In the sleeve according to Example 1 in which 0 to 1.000% by weight was added, the radial crushing strength after recrystallization was 200 N / mm 2 or more, but the content was less than this, or a non-added Comparative Example The radial crushing strength of the sleeve of No. 2 was obviously low.
【００１９】[0019]
【表２】 [Table 2]
【００２０】また，上記表２で示すように，Ｆｅを０．
００１０〜１．０重量％添加した実施例１に係るスリー
ブでは，再結晶後の圧環強度は１８０Ｎ／ｍｍ2 以上で
あったが，これよりも含有量の少ないか，もしくは，無
添加の比較例に係るスリーブでは圧環強度は明らかに小
さかった。Further, as shown in Table 2 above, Fe is less than 0.
In the sleeve according to Example 1 in which 0010 to 1.0% by weight was added, the radial crushing strength after recrystallization was 180 N / mm 2 or more, but the content was less than this, or a comparative example in which no addition was made. The radial crushing strength was obviously low in the sleeve according to (1).
【００２１】[0021]
【表３】 [Table 3]
【００２２】また，上記表３で示すように，Ｗを０．０
１００〜５．０重量％添加した実施例１に係るスリーブ
では，再結晶後の圧環強度は１７０Ｎ／ｍｍ2 以上であ
ったが，これよりも含有量の少ないか，もしくは，無添
加の比較例に係るスリーブでは圧環強度は明らかに小さ
かった。Further, as shown in Table 3 above, W is 0.0
In the sleeve according to Example 1 in which 100 to 5.0% by weight was added, the radial crushing strength after recrystallization was 170 N / mm 2 or more, but the content was less than this, or a comparative example in which no addition was made. The radial crushing strength was obviously low in the sleeve according to (1).
【００２３】[0023]
【表４】 [Table 4]
【００２４】更に，上記表４で示すように，Ｓｉを０．
００１〜０．１重量％，Ｆｅを０．００１０〜０．１０
００重量％，Ｗを０．０１０〜４．０重量％夫々添加さ
れた実施例１に係るスリーブでは，再結晶後の圧環強度
は４３０Ｎ／ｍｍ2 以上であった。Further, as shown in Table 4 above, Si is 0.
001 to 0.1% by weight, Fe 0.0010 to 0.10.
In the sleeve according to Example 1 in which each of 00 wt% and W of 0.010 to 4.0 wt% was added, the radial crushing strength after recrystallization was 430 N / mm 2 or more.
【００２５】（実施例２）実施例１と同様にＡ粉末を作
製する際に，レニウム含有率が５〜９５重量％のＲｅ−
Ｍｏ粉を作り，実施例１と同様に各種ドープを行い，焼
結，転打，管引き加工を行い，圧環強度を調べたとこ
ろ，Ｓｉ：０．００１〜１．０重量％，Ｆｅ：０．００
１〜１．０重量％，Ｗ：０．００５〜５．０重量％で圧
環強度が純Ｍｏ又はＲｅ−Ｍｏ単体より大幅に向上する
ことが分かった。(Example 2) When A powder was produced in the same manner as in Example 1, the Re-content of the rhenium content was 5 to 95% by weight.
Mo powder was produced, various dopes were carried out in the same manner as in Example 1, sintering, rolling, and tube drawing were carried out, and the radial crushing strength was examined. Si: 0.001-1.0 wt%, Fe: 0 .00
It was found that the radial crushing strength was significantly improved as compared with pure Mo or Re-Mo alone when 1 to 1.0% by weight and W: 0.005 to 5.0% by weight.
【００２６】尚，Ｓｉ，Ｆｅ，Ｗの重量％の夫々の上
限，１．０，１．０，５．０重量％を越えると，加工硬
化が著しく激しくなり加工できなかった。When the upper limits of the weight percentages of Si, Fe, and W, 1.0, 1.0, and 5.0 wt%, were exceeded, the work hardening became extremely severe and the work could not be performed.
【００２７】また，Ｒｅ−Ｍｏ合金は，０〜３５重量％
Ｒｅで固溶体，３５〜８６重量％Ｒｅで，Ｍｏ（Ｒｅ）
−ｘ相２相合金，８６〜８８重量％Ｒｅでｘ相，８８〜
９６重量％Ｒｅでｘ相−Ｒｅ（Ｍｏ）２相合金となる
が，いずれの状態でも効果があった。また，レニウム含
有量が，５重量％未満の場合，及び９５重量％を越える
場合は，再結晶後の伸びが低下して，ヒートクラック等
の割れが溶接時に発生してしまい，製品としての性能が
失われてしまった。The Re-Mo alloy contains 0 to 35% by weight.
Solid solution with Re, 35-86 wt% Re, Mo (Re)
-X phase two phase alloy, 86-88 wt% Re x phase, 88-
96 wt% Re gives an x-phase-Re (Mo) two-phase alloy, but it was effective in any state. When the rhenium content is less than 5% by weight or more than 95% by weight, the elongation after recrystallization is reduced, and cracks such as heat cracks occur during welding, resulting in product performance. Has been lost.
【００２８】[0028]
【発明の効果】以上，述べたように，本発明において
は，再結晶後の靭性に優れた円筒状又は帽状のスリーブ
からなるレニウム−モリブデン合金管状部品を提供する
ことができる。As described above, according to the present invention, it is possible to provide a rhenium-molybdenum alloy tubular component having a cylindrical or cap-shaped sleeve having excellent toughness after recrystallization.
【００２９】また，本発明においては，Ｗ，Ｍｏ，Ｔａ
等の高融点金属からなる他の構成部材との溶接性が良好
な，特に，含浸型カソードの構成部品として優れた効果
があるレニウム−モリブデン合金管状部品を提供するこ
とができる。Further, in the present invention, W, Mo, Ta
It is possible to provide a rhenium-molybdenum alloy tubular part which has good weldability with other constituent members made of refractory metal, and which is particularly effective as a constituent part of an impregnated cathode.
【００３０】更に，本発明においては，前記したような
種々の利点を有するレニウム−モリブデン合金管状部品
を用いた含浸型カソードを提供することができる。Furthermore, the present invention can provide an impregnated cathode using a rhenium-molybdenum alloy tubular part having various advantages as described above.
Claims (4)
が開口した円筒状スリーブからなるレニウム−モリブデ
ン合金管状部品であって，前記Ｒｅ−Ｍｏ合金は，Ｒｅ
５〜９５重量％残部Ｍｏからなる合金に，Ｓｉ，Ｆｅ，
及びＷのうちの少なくとも一種を含み，前記Ｓｉの添加
量は，０．００１〜１．０重量％，前記Ｆｅの添加量
は，０．００１〜１．０重量％，及び前記Ｗの添加量
は，０．００５〜５．０重量％であることを特徴とする
レニウム−モリブデン合金管状部品。1. A rhenium-molybdenum alloy tubular component comprising a cylindrical sleeve made of Re-Mo alloy having at least one end opened, wherein the Re-Mo alloy is Re
Alloys consisting of 5 to 95 wt% balance Mo, Si, Fe,
And at least one of W, the addition amount of Si is 0.001 to 1.0% by weight, the addition amount of Fe is 0.001 to 1.0% by weight, and the addition amount of W is Is 0.005-5.0% by weight, rhenium-molybdenum alloy tubular part.
金管状部品において，前記Ｒｅ−Ｍｏ合金は，Ｓｉ，Ｆ
ｅ，及びＷを含み，前記Ｓｉの添加量は，０．００１〜
１．０重量％，前記Ｆｅの添加量は，０．００１〜１．
０重量％，及び前記Ｗの添加量は，０．００５〜５．０
重量％であることを特徴とするレニウム−モリブデン合
金管状部品。2. The rhenium-molybdenum alloy tubular component according to claim 1, wherein the Re-Mo alloy is Si, F.
e, and W, and the amount of Si added is 0.001 to
1.0% by weight, and the addition amount of Fe is 0.001 to 1.
0 wt% and the amount of W added are 0.005 to 5.0
A rhenium-molybdenum alloy tubular part, characterized in that it is in% by weight.
デン合金管状部品において，前記合金管状部品は再結晶
後の圧環強度が１７０〜６００Ｎ／ｍｍ2 であることを
特徴とするレニウム−モリブデン合金管状部品。3. The rhenium-molybdenum alloy tubular part according to claim 1 or 2, wherein the alloy tubular part has a radial crushing strength after recrystallization of 170 to 600 N / mm 2. parts.
レニウム−モリブデン合金管状部品を備えたことを特徴
とする電子管用含浸型カソード。4. An impregnated cathode for an electron tube, comprising the rhenium-molybdenum alloy tubular component according to any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1840994A JP2840915B2 (en) | 1994-02-15 | 1994-02-15 | Rhenium-molybdenum alloy tubular parts for impregnated cathodes for electron tubes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1840994A JP2840915B2 (en) | 1994-02-15 | 1994-02-15 | Rhenium-molybdenum alloy tubular parts for impregnated cathodes for electron tubes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07228940A true JPH07228940A (en) | 1995-08-29 |
| JP2840915B2 JP2840915B2 (en) | 1998-12-24 |
Family
ID=11970872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1840994A Expired - Lifetime JP2840915B2 (en) | 1994-02-15 | 1994-02-15 | Rhenium-molybdenum alloy tubular parts for impregnated cathodes for electron tubes |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2840915B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004214194A (en) * | 2002-12-27 | 2004-07-29 | General Electric Co <Ge> | Sealing tube material for high pressure short-arc discharge lamp |
| JP2005183356A (en) * | 2003-12-17 | 2005-07-07 | General Electric Co <Ge> | Sealing technique for hermetical lamp having uniquely sealed component and lamp |
| US7892061B2 (en) | 2002-12-18 | 2011-02-22 | General Electric Company | Hermetical lamp sealing techniques and lamp having uniquely sealed components |
-
1994
- 1994-02-15 JP JP1840994A patent/JP2840915B2/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7839089B2 (en) | 2002-12-18 | 2010-11-23 | General Electric Company | Hermetical lamp sealing techniques and lamp having uniquely sealed components |
| US7892061B2 (en) | 2002-12-18 | 2011-02-22 | General Electric Company | Hermetical lamp sealing techniques and lamp having uniquely sealed components |
| JP2004214194A (en) * | 2002-12-27 | 2004-07-29 | General Electric Co <Ge> | Sealing tube material for high pressure short-arc discharge lamp |
| EP1434247A3 (en) * | 2002-12-27 | 2006-12-20 | General Electric Company | Sealing tube material for high pressure short-arc discharge lamps |
| US7525252B2 (en) | 2002-12-27 | 2009-04-28 | General Electric Company | Sealing tube material for high pressure short-arc discharge lamps |
| JP2005183356A (en) * | 2003-12-17 | 2005-07-07 | General Electric Co <Ge> | Sealing technique for hermetical lamp having uniquely sealed component and lamp |
| JP4602691B2 (en) * | 2003-12-17 | 2010-12-22 | ゼネラル・エレクトリック・カンパニイ | Sealing technology for sealed lamps with uniquely sealed components and lamps |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2840915B2 (en) | 1998-12-24 |
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