CA2067601C - Transducer carrier for disk file and liquid film head-disk interface - Google Patents
Transducer carrier for disk file and liquid film head-disk interfaceInfo
- Publication number
- CA2067601C CA2067601C CA002067601A CA2067601A CA2067601C CA 2067601 C CA2067601 C CA 2067601C CA 002067601 A CA002067601 A CA 002067601A CA 2067601 A CA2067601 A CA 2067601A CA 2067601 C CA2067601 C CA 2067601C
- Authority
- CA
- Canada
- Prior art keywords
- disk
- carrier
- lubricant
- ski
- file
- 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
- 239000007788 liquid Substances 0.000 title claims abstract description 16
- 239000000314 lubricant Substances 0.000 claims abstract description 85
- 230000006872 improvement Effects 0.000 abstract description 5
- 230000003134 recirculating effect Effects 0.000 abstract description 3
- 238000001704 evaporation Methods 0.000 abstract description 2
- 230000008020 evaporation Effects 0.000 abstract description 2
- 239000010408 film Substances 0.000 description 26
- 239000000725 suspension Substances 0.000 description 16
- 125000006850 spacer group Chemical group 0.000 description 7
- 229930195733 hydrocarbon Natural products 0.000 description 6
- 150000002430 hydrocarbons Chemical class 0.000 description 6
- 239000010687 lubricating oil Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000010702 perfluoropolyether Substances 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000005530 etching Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000007598 dipping method Methods 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000036316 preload Effects 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- 238000000992 sputter etching Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229910000531 Co alloy Inorganic materials 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 238000002679 ablation Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910003481 amorphous carbon Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000007772 electroless plating Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000000572 ellipsometry Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000001459 lithography Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000009828 non-uniform distribution Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011877 solvent mixture Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/60—Guiding record carrier
- G11B15/62—Maintaining desired spacing between record carrier and head
- G11B15/64—Maintaining desired spacing between record carrier and head by fluid-dynamic spacing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B21/00—Head arrangements not specific to the method of recording or reproducing
- G11B21/16—Supporting the heads; Supporting the sockets for plug-in heads
- G11B21/20—Supporting the heads; Supporting the sockets for plug-in heads while the head is in operative position but stationary or permitting minor movements to follow irregularities in surface of record carrier
- G11B21/21—Supporting the heads; Supporting the sockets for plug-in heads while the head is in operative position but stationary or permitting minor movements to follow irregularities in surface of record carrier with provision for maintaining desired spacing of head from record carrier, e.g. fluid-dynamic spacing, slider
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B25/00—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus
- G11B25/04—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card
- G11B25/043—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card using rotating discs
Landscapes
- Magnetic Record Carriers (AREA)
- Supporting Of Heads In Record-Carrier Devices (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US724,696 | 1991-07-02 | ||
| US07/724,696 US5200867A (en) | 1991-07-02 | 1991-07-02 | Transducer carrier for disk file with liquid film head-disk interface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2067601A1 CA2067601A1 (en) | 1993-01-03 |
| CA2067601C true CA2067601C (en) | 1998-05-05 |
Family
ID=24911496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002067601A Expired - Fee Related CA2067601C (en) | 1991-07-02 | 1992-04-29 | Transducer carrier for disk file and liquid film head-disk interface |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US5200867A (en, 2012) |
| EP (1) | EP0522714B1 (en, 2012) |
| JP (1) | JP2500085B2 (en, 2012) |
| KR (1) | KR960013429B1 (en, 2012) |
| CN (1) | CN1052326C (en, 2012) |
| AU (1) | AU650403B2 (en, 2012) |
| CA (1) | CA2067601C (en, 2012) |
| DE (1) | DE69219224T2 (en, 2012) |
| SG (1) | SG44391A1 (en, 2012) |
| TW (1) | TW249857B (en, 2012) |
Families Citing this family (59)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2796852B2 (ja) * | 1988-10-31 | 1998-09-10 | インターナショナル・ビジネス・マシーンズ・コーポレーション | 磁気記憶装置及び方法 |
| WO1993014495A1 (en) * | 1992-01-20 | 1993-07-22 | Fujitsu Limited | Magnetic head assembly, its manufacture, and magnetic disc device |
| US5267104A (en) * | 1992-04-30 | 1993-11-30 | International Business Machines Corporation | Liquid-bearing data recording disk file with transducer carrier having rear ski pad at the head-disk interface |
| US5438467A (en) * | 1992-10-28 | 1995-08-01 | International Business Machines Corporation | Negative pressure air bearing design |
| WO1994011879A1 (en) * | 1992-11-13 | 1994-05-26 | Conner Peripherals, Inc. | Lubricated disk drive |
| WO1994011878A1 (en) * | 1992-11-13 | 1994-05-26 | Conner Peripherals, Inc. | Liquid recirculation in an information storage device |
| US5396383A (en) * | 1992-12-29 | 1995-03-07 | International Business Machines | Integral lubricating fluid delivery system for a flying head in a magnetic disk storage system |
| TW226464B (en, 2012) * | 1992-12-29 | 1994-07-11 | Ibm | |
| US5388017A (en) * | 1993-01-29 | 1995-02-07 | International Business Machines Corporation | Disk file with air-bearing slider having skids |
| US5455730A (en) * | 1993-02-18 | 1995-10-03 | International Business Machines Corporation | Contact magnetic recording disk file with a magnetoresistive read sensor |
| US5418667A (en) * | 1993-08-03 | 1995-05-23 | International Business Machines Corporation | Slider with transverse ridge sections supporting air-bearing pads and disk drive incorporating the slider |
| JPH10501087A (ja) * | 1994-03-02 | 1998-01-27 | コナー ペリフェラルズ インコーポレイテッド | 潤滑化ディスクドライブ用の、酸化に対して安定化された炭化水素液体ベアリング |
| DE19531746C2 (de) * | 1994-08-30 | 2001-05-23 | Fujitsu Ltd | Kopfschieber für ein Magnetplattenlaufwerk |
| DE19549538C2 (de) * | 1994-08-30 | 2000-06-15 | Fujitsu Ltd | Herstellungsverfahren eines Kopfschiebers und Kopfschieber |
| US5841608A (en) | 1994-08-30 | 1998-11-24 | Fujitsu Limited | Head slider with projections arranged on rails thereof |
| JPH08279265A (ja) * | 1995-04-07 | 1996-10-22 | Fujitsu Ltd | 磁気ヘッドスライダ |
| US5661618A (en) * | 1995-12-11 | 1997-08-26 | International Business Machines Corporation | Magnetic recording device having a improved slider |
| US6040031A (en) * | 1996-03-13 | 2000-03-21 | Nec Corporation | Contact recording magnetic disk device |
| JPH10116410A (ja) * | 1996-10-09 | 1998-05-06 | Kagaku Gijutsu Shinko Jigyodan | 接触型磁気ヘッド |
| US5870251A (en) * | 1997-04-14 | 1999-02-09 | Seagate Technology, Inc. | Taperless/crown free/air bearing design |
| US5870362A (en) * | 1997-06-20 | 1999-02-09 | Seagate Technology, Inc. | Slider for optical disc data storage system |
| GB2366657B (en) | 1997-06-27 | 2002-04-24 | Seagate Technology Llc | Slider for disc storage system |
| US6377422B1 (en) | 1997-07-08 | 2002-04-23 | Seagate Technology Llc | Disc head with contact protection feature |
| DE19882586T1 (de) * | 1997-08-15 | 2000-08-03 | Seagate Technology | Gleitstück für Datenspeichersystem |
| JPH1186483A (ja) * | 1997-09-04 | 1999-03-30 | Fujitsu Ltd | ヘッドスライダ及びディスク装置 |
| US6229671B1 (en) | 1997-09-22 | 2001-05-08 | Seagate Technology Llc | Shock pads for a slider for a data storage system |
| US6487043B1 (en) | 1997-12-04 | 2002-11-26 | Seagate Technology Llc | Cross texture head disc interface |
| US6535352B2 (en) | 1997-12-15 | 2003-03-18 | Seagate Technology Llc | Head media interface for stiction control |
| US6230380B1 (en) * | 1998-02-17 | 2001-05-15 | Seagate Technology Llc | Slider for burnishing a disc |
| US6003364A (en) * | 1998-03-19 | 1999-12-21 | Seagate Technology, Inc. | Glide head for testing a disc surface |
| US6535353B2 (en) * | 1998-03-20 | 2003-03-18 | Seagate Technology Llc | Capped polymeric load/unload pads |
| US6683754B2 (en) | 1998-05-21 | 2004-01-27 | Komag, Inc. | Hard disk drive head-media system having reduced stiction and low fly height |
| US6381090B1 (en) | 1998-05-21 | 2002-04-30 | Komag, Incorporated | Hard disk drive head-media system having reduced stiction and low fly height |
| JP3097663B2 (ja) | 1998-06-09 | 2000-10-10 | 日本電気株式会社 | 磁気ディスク装置 |
| US6603639B1 (en) | 1998-07-21 | 2003-08-05 | Seagate Technology Llc | Slider for disc storage system |
| US6322431B1 (en) | 1998-10-13 | 2001-11-27 | Seagate Technology Llc | Burnish head with ion milled aerodynamic pads configured in an elliptical pattern |
| US6459547B1 (en) | 1998-12-09 | 2002-10-01 | Seagate Technology Llc | Slider with pads and textured landing zone for disc storage system |
| JP3815094B2 (ja) | 1998-12-24 | 2006-08-30 | 富士通株式会社 | ヘッドアセンブリ及びディスク装置 |
| US6611400B1 (en) | 1999-01-22 | 2003-08-26 | Seagate Technology Llc | Texture structure for optimizing head disc interface |
| US6304418B1 (en) | 1999-02-11 | 2001-10-16 | Seagate Technology Llc | Enhanced durability ultra-low-flying-height sliders |
| JP2000268513A (ja) * | 1999-03-17 | 2000-09-29 | Tdk Corp | ヘッドスライダ支持体、ヘッド装置およびそれらの製造方法、ならびに情報記録再生装置 |
| KR100724299B1 (ko) * | 1999-05-11 | 2007-06-04 | 소니 가부시끼 가이샤 | 정보처리 장치 |
| US6536265B1 (en) | 1999-12-02 | 2003-03-25 | Seagate Technology Llc | Micro-textured glide sliders for super-smooth media |
| JP3366609B2 (ja) | 1999-12-27 | 2003-01-14 | アルプス電気株式会社 | 磁気ヘッドおよび磁気記録装置 |
| CN1197053C (zh) | 1999-12-28 | 2005-04-13 | 阿尔卑斯电气株式会社 | 在媒体相对面上设置有凸部的磁头滑动块和其制造方法 |
| JP2001210037A (ja) | 2000-01-21 | 2001-08-03 | Alps Electric Co Ltd | 磁気ヘッドスライダ |
| US6882504B2 (en) * | 2000-06-20 | 2005-04-19 | Seagate Technology Llc | Micro textured slider with predicted tipped position |
| US6665147B2 (en) * | 2000-07-05 | 2003-12-16 | Hitachi, Ltd. | Magnetic disk drive with supply of perfluoropolyether as lubricant |
| US6503132B2 (en) | 2000-10-03 | 2003-01-07 | Seagate Technology Llc | Hybrid burnish/glide head with advanced air bearing fly height control rails |
| CN1267897C (zh) | 2000-10-13 | 2006-08-02 | 西加特技术有限责任公司 | 具有带纹理的垫片的磁盘驱动器浮动块 |
| US6700735B2 (en) | 2001-07-27 | 2004-03-02 | International Business Machines Corporation | Disk drive lubricant reservoir systems and lubricants used therein |
| US6958876B2 (en) | 2001-07-27 | 2005-10-25 | Hitachi Global Storage Technologies Netherlands B.V. | Leak detection system of hard disk drives with lubricant reservoir |
| JP2003151229A (ja) * | 2001-11-08 | 2003-05-23 | Internatl Business Mach Corp <Ibm> | ディスク・ドライブ装置、アクチュエータの制御装置、ハード・ディスク・ドライブおよびディスク・ドライブ装置の制御方法 |
| US6804987B2 (en) * | 2002-01-03 | 2004-10-19 | Seagate Technology Llc | Apparatus and method for air-contamination detection in disc drive hydrodynamic bearings |
| US7194802B2 (en) * | 2002-03-26 | 2007-03-27 | Seagate Technology Llc | Tool for certifying a head-gimbal assembly |
| US20060262451A1 (en) * | 2005-05-18 | 2006-11-23 | Samsung Electronics Co., Ltd. | Hard-disk drive design for contact recording applications |
| KR101287211B1 (ko) | 2006-06-30 | 2013-07-16 | 엘지디스플레이 주식회사 | 박막트랜지스터의 제조방법 및 이를 이용한 ｔｆｔ 어레이기판의 제조방법 |
| US7729082B2 (en) * | 2006-07-25 | 2010-06-01 | Hitachi Global Storage Technologies Netherlands B.V. | Application of PFPES for HDD screw lubricant |
| US20110143049A1 (en) * | 2009-12-16 | 2011-06-16 | Xing-Cai Guo | Lubricant removal to reuse disks for conditioning deposition tools |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2969435A (en) * | 1955-02-07 | 1961-01-24 | Ibm | Oil film spacer for magnetic recording device |
| US3060431A (en) * | 1956-02-08 | 1962-10-23 | Lab For Electronics Inc | Magnetic data storage techniques |
| US3005675A (en) * | 1956-02-08 | 1961-10-24 | Lab For Electronics Inc | Fluid bearing control for a magnetic head |
| US4167765A (en) * | 1978-07-27 | 1979-09-11 | International Business Machines Corporation | Transducer suspension mount apparatus |
| US4367503A (en) * | 1980-12-24 | 1983-01-04 | International Business Machines Corporation | Fermetically sealed disk file |
| US4626941A (en) * | 1983-05-26 | 1986-12-02 | Fujitsu Limited | Method and apparatus for suppressing the evaporation of lubricant film coated on magnetic disks of a disk storage |
| US4633351A (en) * | 1983-08-02 | 1986-12-30 | Harris Graphics Corporation | Method and apparatus for hydrodynamic magnetic recording |
| JPS60202538A (ja) * | 1984-03-26 | 1985-10-14 | Nec Corp | 磁気デイスク |
| JPS6148182A (ja) * | 1984-08-10 | 1986-03-08 | Fujitsu Ltd | 浮動形磁気ヘツド |
| US4556969A (en) * | 1984-12-28 | 1985-12-03 | International Business Machines Corporation | Hermetically sealed disk file |
| DE3679494D1 (de) * | 1985-07-19 | 1991-07-04 | Toshiba Kawasaki Kk | Gleitstueckzusammenbau fuer magnetische koepfe. |
| JPH0250376A (ja) * | 1988-08-11 | 1990-02-20 | Fujitsu Ltd | 磁気ディスク装置 |
| US4894740A (en) * | 1988-09-28 | 1990-01-16 | International Business Machines Corporation | Magnetic head air bearing slider |
| US5097368A (en) * | 1988-10-17 | 1992-03-17 | Conner Peripherals, Inc. | Information recording apparatus with a non-Newtonian liquid bearing |
| JP2796852B2 (ja) * | 1988-10-31 | 1998-09-10 | インターナショナル・ビジネス・マシーンズ・コーポレーション | 磁気記憶装置及び方法 |
| DE69018856T2 (de) * | 1989-02-24 | 1995-08-24 | Conner Peripherals Inc | Nasses Festplatten-Laufwerk mit einem konischen Spindellager. |
-
1991
- 1991-07-02 US US07/724,696 patent/US5200867A/en not_active Expired - Lifetime
-
1992
- 1992-01-20 TW TW081100376A patent/TW249857B/zh active
- 1992-04-29 CA CA002067601A patent/CA2067601C/en not_active Expired - Fee Related
- 1992-05-28 AU AU17257/92A patent/AU650403B2/en not_active Ceased
- 1992-06-01 CN CN92104405A patent/CN1052326C/zh not_active Expired - Fee Related
- 1992-06-01 JP JP4140189A patent/JP2500085B2/ja not_active Expired - Fee Related
- 1992-06-02 KR KR1019920009526A patent/KR960013429B1/ko not_active Expired - Fee Related
- 1992-06-11 DE DE69219224T patent/DE69219224T2/de not_active Expired - Fee Related
- 1992-06-11 EP EP92305356A patent/EP0522714B1/en not_active Expired - Lifetime
- 1992-06-11 SG SG1996000088A patent/SG44391A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| HK1000070A1 (en) | 1997-11-07 |
| CN1052326C (zh) | 2000-05-10 |
| EP0522714A3 (en) | 1993-03-03 |
| AU1725792A (en) | 1993-01-07 |
| JP2500085B2 (ja) | 1996-05-29 |
| TW249857B (en, 2012) | 1995-06-21 |
| KR930003072A (ko) | 1993-02-24 |
| DE69219224D1 (de) | 1997-05-28 |
| US5200867A (en) | 1993-04-06 |
| JPH05151735A (ja) | 1993-06-18 |
| EP0522714B1 (en) | 1997-04-23 |
| SG44391A1 (en) | 1997-12-19 |
| EP0522714A2 (en) | 1993-01-13 |
| CN1068440A (zh) | 1993-01-27 |
| AU650403B2 (en) | 1994-06-16 |
| DE69219224T2 (de) | 1997-10-16 |
| CA2067601A1 (en) | 1993-01-03 |
| KR960013429B1 (ko) | 1996-10-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |