JPH03263753A - Nonmagnetic battery - Google Patents
Nonmagnetic batteryInfo
- Publication number
- JPH03263753A JPH03263753A JP9062097A JP6209790A JPH03263753A JP H03263753 A JPH03263753 A JP H03263753A JP 9062097 A JP9062097 A JP 9062097A JP 6209790 A JP6209790 A JP 6209790A JP H03263753 A JPH03263753 A JP H03263753A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- magnetic
- stainless steel
- batteries
- positive
- 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.)
- Pending
Links
- 230000005291 magnetic effect Effects 0.000 claims abstract description 28
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 14
- 239000011572 manganese Substances 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 13
- 239000010935 stainless steel Substances 0.000 claims abstract description 13
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 12
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 9
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 239000008151 electrolyte solution Substances 0.000 claims 1
- 238000005260 corrosion Methods 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 4
- 230000005408 paramagnetism Effects 0.000 abstract description 4
- 230000035699 permeability Effects 0.000 abstract description 3
- 238000003754 machining Methods 0.000 abstract 2
- 229910001566 austenite Inorganic materials 0.000 abstract 1
- 230000005298 paramagnetic effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000005389 magnetism Effects 0.000 description 4
- 239000000696 magnetic material Substances 0.000 description 3
- 239000007773 negative electrode material Substances 0.000 description 3
- 239000002907 paramagnetic material Substances 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 239000002889 diamagnetic material Substances 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- NDVLTYZPCACLMA-UHFFFAOYSA-N silver oxide Chemical compound [O-2].[Ag+].[Ag+] NDVLTYZPCACLMA-UHFFFAOYSA-N 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 241000545744 Hirudinea Species 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000006182 cathode active material Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 125000001891 dimethoxy group Chemical group [H]C([H])([H])O* 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 229910001105 martensitic stainless steel Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229910001923 silver oxide Inorganic materials 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、非磁性材料から構成された非磁性電池に関す
るもので、マンガン乾電池、アルカリマンガン乾電池、
酸化銀電池、水銀電池、空気亜鉛電池、リチウム電池な
どの一次電池および二次電池に適用でき、磁気測定器等
に用いられる電池として、大変に有用なものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to non-magnetic batteries made of non-magnetic materials, such as manganese dry batteries, alkaline manganese dry batteries,
It can be applied to primary and secondary batteries such as silver oxide batteries, mercury batteries, zinc air batteries, and lithium batteries, and is extremely useful as batteries used in magnetic measuring instruments and the like.
本発明は、少なくとも電池の負極および正極の端子を兼
ねるそれぞれの缶材料を、高い加工率で加工を施しても
強磁性化しない特殊なステンレス鋼として構成した電池
であり、実質的に非磁性化した電池に関するものである
。The present invention is a battery in which the can material, which also serves as at least the negative and positive terminals of the battery, is made of a special stainless steel that does not become ferromagnetic even when processed at a high processing rate, and is substantially non-magnetic. This relates to batteries that have been used.
従来の電池は、−Ｓ的に負極および正極缶としてニッケ
ルめっきを施した炭素鋼板や、マルテンサイト系、フェ
ライト系、オーステナイト系などのステンレス鋼板を単
独またはめっき、クラ、ドなどによる他の金属との複合
材が用いられてきた。Conventional batteries use nickel-plated carbon steel sheets or martensitic, ferritic, or austenitic stainless steel sheets as the negative and positive electrode cans, either alone or in combination with other metals by plating, cladding, or cladding. Composite materials have been used.
従来のこれらの金属材料は、電池缶として要求される電
池の封止性、リードとしての電気的接触抵抗、耐腐食性
などの点から、高い機械的強度、高耐食性の材料として
用いられてきた。しかし、これらの金属材料はいわゆる
強磁性材料であり、−船釣には非磁性といわれるオース
テナイト系ステンレス鋼も、実際には電池、缶乙こ刷子
した場合には１．マルテンザイト化し、その加工率に応
し５で磁性化の度合いが増し１、非磁性電池とはいえな
かった。Conventionally, these metal materials have been used as materials with high mechanical strength and high corrosion resistance from the viewpoints of battery sealing properties required for battery cans, electrical contact resistance as leads, corrosion resistance, etc. . However, these metal materials are so-called ferromagnetic materials, and even austenitic stainless steel, which is said to be non-magnetic for boat fishing, actually has 1. The battery became martenzite, and the degree of magnetization increased at 5 and 1 depending on the processing rate, so it could not be said to be a non-magnetic battery.
（”Ｊ題を解決するための手段〕
前記問題点を解決するために、いわゆる３Ｉ磁性（常磁
性または反磁性材料）材料を種々検創してきた結果、Ｃ
ｕなとの反磁性材料、Ａｊ！、Ｔｉなどの常磁性材料は
、耐食性、機械的強度、材料コストなどの点から電池色
として適しているものとはいえなかった。本発明は電池
材料としζ、どんな加工率を受ＵてもオースヲＪヘイ１
スヲンレス網以−トの常磁性１．ヘルを維持する高マン
ガンスう一ンレス鍜が最適であることを見出し７たこと
によるものである。(Means for solving the "J problem") In order to solve the above problem, as a result of examining various so-called 3I magnetic (paramagnetic or diamagnetic materials) materials, we found that C
Diamagnetic material with u, Aj! , Ti, and other paramagnetic materials have not been suitable as battery colors in terms of corrosion resistance, mechanical strength, material cost, and the like. The present invention is a battery material.
Paramagnetism of Swanless net 1. This is due to the discovery that a high-manganese single-less stove that maintains health is optimal7.
（作用）
本発明は、磁気測定器などの磁気センサーを有する機器
に用いる電池ωためのもので次）る。そのた、電池とし
ては電池そのものが、人きな残留磁気（持ちや３”いも
のであったり、磁気センザー周辺のり１部磁場を電池の
持つ透磁性で乱すちのであっては正確な磁気の測定がご
きないため、常磁性レヘルの非磁性電池が望ましい。既
７１″の電池系では、活物質である、Ｚｎ、 ｌ、ｉ、
Ｍｎ０ｚ、 ＣＩ’ｎ、 ＡｇｚＯＨＲ，Ｏなどはい
ずれも、常磁性または反る５マ性材料であるために磁性
の影響はないが１．すでに述べたように電池の正負極缶
材、集電体材料などが強研情材料であった。これらを３
Ｆ磁性材料に変える必要があった本発明は、前述し、た
よう↓ご、全ての力Ｌ１−率域ごも常磁性を示す高マン
ガンズー）ンレス鋼を正負掬缶および集電体に用いこ、
非付性電池が得られるものて′ある。(Function) The present invention is for a battery ω used in a device having a magnetic sensor such as a magnetometer. In addition, if the battery itself has a strong residual magnetism (3"), or if the magnetic field around the magnetic sensor is partially disturbed by the battery's magnetic permeability, it is difficult to accurately measure magnetism. A non-magnetic battery with a paramagnetic level is preferable because it does not cause vibration.In the existing 71" battery system, active materials such as Zn, l, i,
Mn0z, CI'n, AgzOHR, O, etc. are all paramagnetic or warped 5-magnetic materials, so they are not affected by magnetism, but 1. As already mentioned, the positive and negative electrode can materials and current collector materials of batteries were highly research-intensive materials. these 3
The present invention, which had to be changed to F magnetic material, uses high manganese-free steel, which exhibits paramagnetism in all force L1-rate ranges, for the positive and negative scoops and the current collector. ,
There are ways to obtain non-adhesive batteries.
塩１ミーに本発明の実施例を図に用いて説明づる。 An embodiment of the present invention will be explained below with reference to the drawings.
第１図は本発明の一実施例ボタン形電池の断面図である
。１は負極活１７Ｉ質を収容づる負極０−□、２は正極
活物質を収容′する正極缶、３は負極活物質、４は正極
活物質、５はセパレータ、６はガスゲノ１である。′Ｉ
：施例施油電池い一ζ史に詳述すると、３：まり・ヂＩ
′ｙ Ｊ、、金庫、４１！ＭｎＯ２，グラフアイ１およ
びヲーノ「ｊ＞粉末０）混名物からなる正極合剤成形体
５はポリプロピし・ン不織Ａｊ、６はボリブ０ビＬ・ン
からなるガスケットであり、電解液はＰＣ（−７’ロピ
レンカーボネー））とＤＭＥ （ジメトキシ・・Ｊタン
）を重量比で１８１こし、た混合溶媒で、過塩素酸リー
チ１″）Ｊ、を１モル熔解したものである。ここで、１
および２は、（ｊ来のニッケルめっき（１０ｕｍ厚メノ
ー１−層）炭素釦ｌ板、５ＵＳ４３０ （フェモイｌ
−系ス子ンレス鋼）、Ｓｉ、ＪＳ３０４ （オースラナ
イト系ステ〉レス綱）、それ乙ご本発明の高マンガンス
テンレス鋼板（１４〜１６％重景翳、３〜６重量％Ｎ＋
１４〜１８重景％Ｃｒ、残りＦｅ）を用いこ各々５０ケ
の電池を組をてた。、二のときの電池は直径２０龍、高
さ１．６ｎの寸法であ２つ、１および２の４）Ｉネｌ厚
さはＯ２５＋ｎであった。これらの電、池を磁！Ａ測定
器に内蔵し、一定の磁場中（ｉ ＫＯｅ＞における磁気
量の測定値がこれらの電池により受ける影、４度を調べ
た７、なお、この測定器には、磁気センサーも内蔵、さ
れており、従って電池は一比較的近接しマ、いる。また
測定器ｒキ」の電池以夕）の磁気的影響４およびづもの
は、最小限にと、たものである。電池の磁気口′・」影
響を最も小さくした比較例としては、電池を測定器外に
十分離れた位置においた夕）部電源方へとした。FIG. 1 is a sectional view of a button-type battery according to an embodiment of the present invention. 1 is a negative electrode 0-□ containing a negative electrode active material, 2 is a positive electrode can containing a positive electrode active material, 3 is a negative electrode active material, 4 is a positive electrode active material, 5 is a separator, and 6 is a gas generator 1. 'I
:Example Oiled Battery Ichiζ History, 3: Mari Di I
'y J,, safe, 41! The positive electrode mixture molded body 5 is made of a mixture of MnO2, Grapheye 1, and Wono "J>Powder 0", and 6 is a gasket made of polypropylene non-woven material, and the electrolyte is a polypropylene nonwoven material. (-7'ropylene carbonate)) and DME (dimethoxy...J tan) at a weight ratio of 181, and 1 mol of perchloric acid leech 1'') J was dissolved in a mixed solvent. Here, 1
and 2 are (nickel plated (10um thick agate 1-layer) carbon button l plate, 5US430 (femoyl)
- based stainless steel), Si, JS304 (auslanite stainless steel), and the high manganese stainless steel sheet of the present invention (14-16% heavy weight, 3-6% N+
Fifty batteries each were assembled using 14-18% Cr and the rest Fe. , 2 had a diameter of 20mm, a height of 1.6n, and a thickness of 4) I of 1 and 2 of 025+n. Magnetize these batteries and ponds! We investigated the influence of these batteries on the measured value of the amount of magnetism in a constant magnetic field (i KOe > 4 degrees) with the built-in magnetic sensor in this measuring device. Therefore, the batteries are relatively close to each other.Furthermore, the magnetic influence of the batteries on the measuring instrument (4) is kept to a minimum. As a comparative example in which the effect of the battery's magnetic port was minimized, the battery was placed outside the measuring instrument at a sufficient distance and placed in the direction of the power source.
表１ 磁気測定器の誤差（％）（外部電源ブノ式を基生
→Ｎ］め、つき炭素鋼
± １０％
Ｓ ｔ、、ｌ ３３ ０ ４
± ３％
高マンガンステンレス鋼（４発明）ｌ−１％外部電源７
ｊ式
表１は、こ才１らの、に験の結果である。夕（部電源方
式の場合を基（Ｖと（、たときのｎ：５０の平均誤Ｚ・
で示Ｌ７］こも０である。この結果から明らかなように
、電池の正 負極缶材質ζ１４：より 磁気的影響は色
視できないものであり１７本発明の高マンガンスブンＬ
・ス鋼を用いた電池は著しい効果を示し７ている。これ
らは、第２１ｇ１に示づ冷間力１１工′ｉ４スと透ｉｆ
ｆ率測昇の結果からも示されるように、実際の￥施ζ５
゛用いる正負極短は、絞り加Ｌａ：′：よりｉｍ常３０
〜５０％の加工率を受けるために、いわゆる常磁性材料
といわれる５ＵＳ３０４ステンレス鋼も相当に磁気的性
質が強くなってしまうが、本発明になる高マンガンステ
ンレス鋼の場合は、高い加工率域においても常磁性の性
質を維持するために、このような効果を生み出している
ことは明らかである。Table 1 Magnetic measuring instrument error (%) (Based on external power source type → N) Carbon steel with ± 10% S t,, l 33 0 4 ± 3% High manganese stainless steel (4 inventions) l- 1% external power supply 7
Table 1 shows the results of experiments conducted by Kosai et al. (Based on the case of partial power supply method)
L7] is also 0. As is clear from this result, the magnetic influence of the positive and negative electrode can materials of the battery cannot be seen in color.
・Batteries using steel have shown remarkable effects7. These are the cold force 11'i4 step shown in No. 21g1 and the transparent if
As shown from the results of the f-rate measurement, the actual
゛The positive and negative poles to be used are usually 30 from the aperture La:':
5US304 stainless steel, which is a so-called paramagnetic material, also has considerably strong magnetic properties in order to be subjected to a processing rate of ~50%, but in the case of the high manganese stainless steel of the present invention, in the high processing rate range. It is clear that this effect is produced in order to maintain paramagnetic properties.
なお、本実施例はリチウム電池のボタンサイズの場合で
あるが、他の電池形であるマンガン乾電池、アルカリマ
ンガン乾電池、銀電池、水銀電池、空気亜鉛電池、また
形状も節糸、ペーパー形いずれの場合においても同様の
効果があることは明らかである。Note that this example deals with button-sized lithium batteries, but other battery types such as manganese dry batteries, alkaline manganese dry batteries, silver batteries, mercury batteries, and zinc-air batteries, as well as any shape, such as knotted string or paper type, are also applicable. It is clear that there is a similar effect.
本発明は以上詳述したように、全ての加工率域で常磁性
で、高い機械的強度、高耐食性を持つ高マンガンステン
レス鋼を、少なくとも電池の正負極短に用いたので、磁
気測定器等の装置に内蔵しでも正確な磁気測定が可能と
なる等、その工業的価値は極めて大きいものである。As described in detail above, the present invention uses high manganese stainless steel, which is paramagnetic in all processing rate ranges, has high mechanical strength, and high corrosion resistance, at least for the positive and negative poles of the battery. Its industrial value is extremely large, as it enables accurate magnetic measurements even when built into other devices.
第１図は本発明の一実施例電池の断面図、第２図は代表
的ステンレス鋼の冷間加工率と透磁率の特性グラフであ
る。
・負極短
・正極缶
・負極活物質
・正極活物質
・セパレータ
以上FIG. 1 is a sectional view of a battery according to an embodiment of the present invention, and FIG. 2 is a characteristic graph of cold working rate and magnetic permeability of a typical stainless steel.・Short negative electrode ・Cathode can ・Negative electrode active material ・Cathode active material ・More than separator
Claims (1)
ータを有する密封形電池において、少なくとも該電池の
負極端子を兼ねる負極缶および正極端子を兼ねる正極缶
の材質を１４〜１６重量％Ｍｎ、３〜６重量％Ｎｉ、１
６〜１８重量％Ｃｒを含む高マンガンステンレス綱とし
たことを特徴とする非磁性電池。In a sealed battery having a positive electrode, a negative electrode, an electrolytic solution, and a separator for separating the positive and negative electrodes, the material of at least the negative electrode can that also serves as the negative electrode terminal of the battery and the positive electrode can that also serves as the positive electrode terminal is 14 to 16% by weight Mn, 3 to 3% by weight. 6wt% Ni, 1
A non-magnetic battery characterized by being made of high manganese stainless steel containing 6 to 18% by weight of Cr.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9062097A JPH03263753A (en) | 1990-03-13 | 1990-03-13 | Nonmagnetic battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9062097A JPH03263753A (en) | 1990-03-13 | 1990-03-13 | Nonmagnetic battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03263753A true JPH03263753A (en) | 1991-11-25 |
Family
ID=13190206
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9062097A Pending JPH03263753A (en) | 1990-03-13 | 1990-03-13 | Nonmagnetic battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03263753A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6894456B2 (en) | 2001-11-07 | 2005-05-17 | Quallion Llc | Implantable medical power module |
| JP2016171169A (en) * | 2015-03-12 | 2016-09-23 | セイコーインスツル株式会社 | Electrochemical cell, and electrochemical cell with terminal |
| WO2019008857A1 (en) * | 2017-07-05 | 2019-01-10 | パナソニックＩｐマネジメント株式会社 | Production method for cylindrical cell and production method for cylindrical cell battery case |
-
1990
- 1990-03-13 JP JP9062097A patent/JPH03263753A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6894456B2 (en) | 2001-11-07 | 2005-05-17 | Quallion Llc | Implantable medical power module |
| JP2016171169A (en) * | 2015-03-12 | 2016-09-23 | セイコーインスツル株式会社 | Electrochemical cell, and electrochemical cell with terminal |
| CN105977404A (en) * | 2015-03-12 | 2016-09-28 | 精工电子有限公司 | Electrochemical cell and electrochemical cell with terminal |
| WO2019008857A1 (en) * | 2017-07-05 | 2019-01-10 | パナソニックＩｐマネジメント株式会社 | Production method for cylindrical cell and production method for cylindrical cell battery case |
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