WO2006070435A1 - 磁気記録媒体の記録データ消去装置、磁気記録媒体の記録データ消去方法、磁気記録媒体の記録データ消去装置を制御するプログラム - Google Patents
磁気記録媒体の記録データ消去装置、磁気記録媒体の記録データ消去方法、磁気記録媒体の記録データ消去装置を制御するプログラム Download PDFInfo
- Publication number
- WO2006070435A1 WO2006070435A1 PCT/JP2004/019507 JP2004019507W WO2006070435A1 WO 2006070435 A1 WO2006070435 A1 WO 2006070435A1 JP 2004019507 W JP2004019507 W JP 2004019507W WO 2006070435 A1 WO2006070435 A1 WO 2006070435A1
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- WO
- WIPO (PCT)
- Prior art keywords
- magnetic field
- capacitor
- data erasing
- recording medium
- recorded data
- Prior art date
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
- G11B5/024—Erasing
- G11B5/0245—Bulk erasing
Definitions
- Recording data erasing device for magnetic recording medium recording data erasing method for magnetic recording medium, program for controlling recording data erasing device for magnetic recording medium
- the present invention relates to a recording data erasing device for a magnetic recording medium used for erasing data recorded on a magnetic recording medium such as a hard disk device, a magnetic tape, and a flexible disk, and a recording data erasing method for a magnetic recording medium
- the present invention also relates to a program for controlling a recorded data erasing device of a magnetic recording medium.
- a magnetic recording medium such as a node disk device, a flexible disk, or a magnetic tape
- the data recorded on the magnetic recording medium is recorded from the viewpoint of preventing data leakage. Erasing is generally done.
- a toroidal coil wound around the outer peripheral surface of an annular core is disposed in the erasing device main body.
- the thing which connected AC power supply to the coil is known (for example, refer to patent documents 1).
- a flexible disk, a tape, or the like is arranged on the outer surface of the apparatus body.
- the coil is supplied with an alternating current from an alternating current power source to generate an alternating magnetic field, and the data recorded on the magnetic recording medium is erased by this magnetic field.
- the applicant of the present invention first stores electricity in a capacitor, generates a magnetic field by a coil using the stored electricity, and records data recorded on the magnetic recording medium by the magnetic field. Apply for a device to erase.
- Patent Document 1 Patent Publication No. 2545451
- Patent Document 2 Japanese Patent Application No. 2002-356962
- Patent Document 3 Japanese Patent Application No. 2002-356965
- the data erasing device is for erasing data recorded using a magnetic field, the state of the erasing process cannot be visually confirmed, and the recording medium after the erasing process is also not available. Since there is no change in appearance, it cannot be easily confirmed whether or not the data on the magnetic recording medium is completely erased after the erasing process. In other words, even if you intend to perform erasure processing, the erasure device has some trouble and the magnetic field strength does not reach the specified value, or the magnetic field is not generated at all. In order to confirm these, it is necessary to confirm whether the data recorded on the processed magnetic recording medium is completely erased or not. It was necessary to check with a device such as a computer!
- the present invention has been made in view of such a technical problem, and confirms that data recorded on a magnetic recording medium is erased with a certain degree of certainty. It is an object of the present invention to provide a program for controlling a recording data erasing apparatus for a magnetic recording medium, a recording data erasing method for a magnetic recording medium, and a recording data erasing apparatus for a magnetic recording medium.
- a recorded data erasing apparatus for a magnetic recording medium comprises a magnetic field generating coil and an excitation control unit for exciting the magnetic field generating coil, and the excitation control
- the unit includes a capacitor, and the capacitor is charged with electricity, the electricity discharged from the capacitor is supplied to the coil to generate a magnetic field, and the data recorded on the magnetic recording medium is erased by the magnetic field.
- the magnetic recording device further comprises a charging voltage monitoring unit for confirming a charging voltage of the capacitor, and an operation check unit for executing an abnormal processing operation based on the output of the charging voltage monitoring unit.
- the operation check unit is configured to execute an abnormality processing operation based on a charging time and a charging voltage for the magnetic field generating capacitor.
- input voltage monitoring means for monitoring the voltage of the electric power input to the recorded data erasing device
- the operation check section is based on outputs from the input voltage monitoring means and the charging voltage monitoring means. It is desirable to have a configuration that executes abnormal processing operations.
- As the abnormality processing operation it is recommended to notify the user of an abnormality or to cancel data erasure. Of course, you can both notify the abnormality and cancel the process as an error handling operation! The same applies to the invention of the method described later.
- the magnetic field generating coil generates a damped alternating magnetic field whose peak value decreases with time. The same applies to the invention of the method described later.
- an invention about a method for solving the same problem includes a magnetic field generating coil and an excitation control unit for exciting the magnetic field generating coil, and the excitation control unit includes a capacitor, -Charge the capacitor with electricity, supply the electricity discharged from the capacitor to the coil, generate a magnetic field, and record it on the magnetic recording medium!
- This is a method of erasing data recorded on a magnetic recording medium with a magnetic field using a recorded data erasing device that erases squeezed data with the magnetic field, and the capacity of the magnetic field generating capacitor is predetermined before the data erasing process. It is determined that the value is equal to or greater than the value of the above, and when this satisfies the above condition and is! / ⁇ , an abnormal processing operation is performed.
- the abnormality processing is executed not only in the case described above but also when the input voltage of the power supplied to the excitation control unit is within a predetermined range and this does not satisfy the condition. Hope that
- the input voltage after the data erasing process is within a predetermined range, and it is determined that the capacity of the magnetic field generating capacitor after the data erasing process is greater than or equal to a predetermined value. Even if at least one of the above-mentioned conditions satisfies the set condition, it is desirable to perform an abnormality processing operation.
- Another invention for solving the same problem includes a magnetic field generating coil and an excitation control unit for exciting the magnetic field generating coil, the excitation control unit including a capacitor, and Is charged with electricity, and electricity discharged from the capacitor is supplied to the coil to generate a magnetic field, which is recorded on the magnetic recording medium!
- the recorded data is magnetically recorded on the magnetic recording medium.
- the capacitor charging voltage after a lapse of a certain time from the start of the data erasing process is determined to be close to 0 V and below a predetermined value, and this satisfies the above conditions.
- the recorded data erasing method is characterized by performing an abnormal processing operation.
- the capacitance of the magnetic field generating capacitor is determined to be greater than or equal to a predetermined value, and there are few of the two conditions. In both cases, it is recommended that abnormal operation be performed even if one does not meet the set conditions.
- the determination as to whether the capacity of the magnetic field generating capacitor is greater than or equal to a predetermined value is made by charging the magnetic field generating capacitor and based on the charging time and the charging voltage at that time! be able to.
- the invention relating to the program is a program for controlling an apparatus for erasing data recorded on a magnetic recording medium by a magnetic field, and is supplied to an excitation control unit for exciting a magnetic field generating coil. Determining that the power input voltage is within a predetermined range; determining that the capacity of the magnetic field generating capacitor is greater than or equal to a predetermined value before the data erasure process; and at least one of the two values. If one of the above conditions is V ⁇ , a warning is issued or Z and the data erasure process are canceled.
- a magnetic recording medium comprising: a step of determining that the capacity of the generating capacitor is equal to or greater than a predetermined value; and a step of warning if at least one of the three conditions satisfies a set condition.
- the above-described program is installed in a recorded data erasing device of a magnetic recording medium.
- the data erasing device of the magnetic recording medium can detect a decrease in erasing capability due to a disturbance of the erasing device or a disturbance such as a decrease in input voltage before the data erasing process. Therefore, the recorded data cannot be erased completely. It is possible to omit unnecessary data erasure processing and subsequent unnecessary confirmation work.
- FIG. 1 is a perspective view showing a data erasing device of a magnetic recording device according to an embodiment of the present invention.
- FIG. 2 is a partially cutaway side view showing a data erasing apparatus that works according to an embodiment of the present invention.
- FIG. 3 is a perspective view showing a coil and a box-shaped case in the data erasing apparatus according to one embodiment of the present invention.
- FIG. 4 is an electric circuit diagram showing a DC power supply circuit in a data erasing apparatus according to one embodiment of the present invention.
- the present invention can be similarly applied to other magnetic recording media such as a magnetic tape and a flexible disk, which are described using a hard disk device as an example of a magnetic recording medium to be erased.
- the data erasing device A is provided in the device main body 1, the insertion space 2 provided in the device main body 1 and into which the hard disk device M is inserted, and provided in the device main body 1.
- the magnetic field generating means 3 and the magnetic part 4 disposed in the magnetic field of the magnetic field generating means 3 are provided.
- the apparatus body 1 is mounted on a box-shaped case 11 with a front end surface opened, a lid 12 that closes an opening 11a of the box-shaped case 11 so as to be openable and closable, and an outer surface of the box-shaped case 11. Open front edge And a synthetic resin box-shaped outer package 13.
- the front end opening 11a of the box-shaped case 11 is closed with the lid body 12, the front end opening of the exterior body 13 is also closed so that it can be opened and closed.
- a base end of a plate-like holding member 14 that protrudes rearward in a horizontal posture is fixed to the rear surface of the lid 12, and the hard disk device M is placed on the upper surface of the holding member 14. It has become.
- the holding member 14 is formed to have such a width that the hard disk device M can be held and entered into the recess 2 when the lid 12 closes the opening 11a of the box-shaped case 11.
- the holding member 14 is not limited to a plate shape as long as it has a structure capable of supporting the hard disk device M.
- the lid 12 is attached to the opening end of the box-shaped case 11 or the exterior body 13 with a hinge or the like. It may be configured so that it can be opened and closed.
- the magnetic field generating means 3 includes, for example, a coil 32 wound around the outer surface of the coil spool 31 in the longitudinal direction as shown in FIG. 3 and a DC power supply circuit (FIG. 5) described later. It consists of and. A flat cylindrical inner space of the coil spool 31 is configured as the insertion space 2. Note that flange portions 31 a and 3 lb are formed at both front and rear ends of the coil spool 31, respectively.
- the coil spool 31 is accommodated in the box-shaped case 11 so that the front collar portion 31a is fitted in the opening 11a of the box-shaped case 11, and the coil spool 31 is interposed via the both collar portions 31a, 31b.
- the opening 31c of the front collar 3la is the front end opening of the space 2, that is, the entrance of the hard disk device M.
- the coil 4 generates a magnetic field in a direction penetrating the insertion space 2, which is an inner space of the coil spool 31, by the excitation control unit 5, and a hard disk ( The recorded data (not shown) is erased.
- the box-shaped case 11 and the lid body 12 are formed of a ferromagnetic material, for example, a plate-shaped iron material or an alloy thereof, and constitute the magnetic body portion 4.
- the magnetic part 4 increases the magnetic flux in the insertion space 2 due to the magnetic field generated by the coil 32, and makes the magnetic flux density in the cross section of the insertion space 2 uniform, thereby making the hard disk device M It has a role to add to. In other words, the magnetic body part 4 erases data by the magnetic field of the coil 32. This is to promote and equalize the action. This is because the box case 11 and the lid body 12 made of the iron-based material can easily pass the magnetic field lines in which the coil force is generated, and for this reason, the magnetic flux in the insertion space 2 is increased and made uniform.
- the magnetic force increases at the opening end of the case 11 (near the insertion opening of the node disk device M).
- the constituent material of the magnetic body portion 4 is not limited to the iron-based material, but may be other ferromagnetic materials such as nickel.
- the box-shaped case 11 and the lid 12 may be made of a paramagnetic material such as aluminum or titanium. Also in this case, the magnetic flux in the insertion space 2 can be increased and the magnetic flux density can be made uniform. This is presumably because an eddy current is generated on the surface or inside of the box-shaped case 11 and the lid 12 by the magnetic field, and this eddy current further generates a magnetic field.
- an excitation control unit 5 is installed in the apparatus main body 1 to excite the coil 32.
- the excitation control unit 5 includes a DC conversion unit 51 that converts a commercial AC power supply voltage input through a power cord 42 having a commercial AC power supply connection plug 41 into a predetermined DC voltage, and a DC conversion unit 51
- the capacitor 52 is charged by power supply and is connected in parallel to the coil 32, the rear tuttle 53 inserted in the input line from the DC converter 51 to the capacitor 52, and the capacitor 52 and the coil 32.
- a switch element 54 inserted therein.
- Input voltage monitoring means 56 is provided which can measure the voltage of
- the data transmitted from the charging voltage monitoring means 55 and the input voltage monitoring means 56 are analyzed, and if the data does not satisfy a certain condition, a warning is given with a buzzer or a lamp, and the process proceeds to the next step.
- An operation check unit 57 that can prevent the above is provided.
- the switch element 54 of the excitation control unit 5 With the switch element 54 of the excitation control unit 5 open, the switch is connected to an AC commercial power supply via the power cord 42.
- input voltage data is sent from the input voltage monitoring means 56 to the operation check unit 57. Be trusted.
- the operation check unit 57 determines whether the input voltage is within a predetermined range. If the input voltage is out of the predetermined range, the user is warned of an abnormality with a warning sound and a lamp, and the capacitor 52 The DC converter 51 is controlled so as not to charge the battery.
- the above input voltage range is ⁇ 5% when the input voltage rating is 100V.
- the predetermined range is 95V or more and 10 5V or less. Therefore, when the input voltage is less than 95V or higher than 105V, the operation check unit warns of an abnormality and controls the operation of the DC conversion unit 51.
- the charging voltage monitoring means 55 measures the charging voltage of the capacitor 52 after a certain time has elapsed since the charging start force.
- the value of the charging voltage is transmitted to the operation check unit 57, and it is determined whether the voltage is below a predetermined value.
- the charging voltage of the capacitor is higher than a predetermined value, the user is warned of an abnormality with a warning sound and a lamp, and the DC converter 51 is controlled so as to stop charging the capacitor 52.
- the predetermined value of the charging voltage is 380V when the rated capacity of the capacitor is S4700 / z F. In the case of the present embodiment, the fixed time is 5 seconds.
- an increase in the charging voltage (terminal voltage) of the capacitor after a lapse of a certain time from the start of charging indicates that the capacity of the capacitor 52 has decreased. Is monitoring the capacity of the capacitor 52.
- the allowable deterioration of the capacitor is preferably within -10% of the rated capacity.
- the charging time and the charging voltage (voltage between terminals) for a capacitor that has deteriorated in advance are The relationship between the relationship and the time of the capacitor with the rated capacity force of 10% deterioration and the charging voltage should be investigated and determined based on the data concerned.
- the capacitor 52 is subsequently charged to prepare for data erasure processing.
- the hard disk device M that needs to erase the recorded data is inserted into the holding member 14. Then, it is placed with its thickness direction set to the height direction. The operation may be performed before the check act. Next, the holding member 14 is advanced into the insertion space 2, and the opening 12a of the box-shaped case 11 is closed with the lid 12, so that the hard disk device M is inserted into the insertion space as shown in FIG. Inserted in place 2.
- an erasing process is performed.
- the capacitor 52 in the excitation control unit 5 is fully charged, and the power supply has already been cut off.
- the switch element 54 is closed, the charge of the capacitor 52 is discharged to the coil 32, and the internal space of the coil 32, that is, the hard disk device M is arranged by this discharge.
- a magnetic field is generated at location 2, and the magnetic field lines generated by the magnetic field penetrate the metal case of the hard disk device M, so that data including cylinder information recorded on the internal hard disk is erased.
- the magnetic field generated by the coil 32 is preferably a damped alternating magnetic field whose peak value decreases with time.
- a damped alternating magnetic field refers to a magnetic field in which the magnetic flux density decreases as the magnetic poles are alternately reversed.
- the magnetic material when a magnetic field is suddenly applied around a magnetic material, the magnetic material can be magnetized to a predetermined strength. Further, the magnetic material can be demagnetized by positioning the magnetized magnetic material in the magnetic field and gradually decreasing the strength of the magnetic field to zero, or by gradually moving the magnetized magnetic material away from the magnetic field force. Such demagnetization characteristics are also applied to demagnetizers (head erasers) of magnetic heads used in tape recorders and video recorders.
- the operation check unit 57 issues a warning that the erasure process is incomplete.
- the warning may be the same warning as in the prior check, or the type of warning sound, the warning emission color or the emission pattern may be different.
- the predetermined time is 1 second in the present embodiment, and the determination of OV may be determined as OV if the discharge is completed if it is 3 V or less in consideration of noise or the like. If the voltage after discharge is 3 V or less, it is considered that data has been sufficiently erased, and if it is IV or less. The certainty is improved.
- the predetermined range is the same as in the case of the prior check.
- charging of the capacitor 52 is started, and the charging voltage of the capacitor 52 after a certain time has elapsed from the start of charging is measured by the charging voltage monitoring means 55, and it is determined whether the voltage is equal to or lower than a predetermined value. To do. When the capacitor charging voltage is higher than the specified value, the user is warned of an abnormality with a warning sound and lamp.
- the fixed time and the predetermined value are the same as in the case of the prior check.
- the hard disk device that is a recording medium is placed in the data erasing device 1 in a single state.
- the manner of placing the recording medium in the device is arbitrary, and the above-described Similarly, a plurality of recording media may be packed in a box or the like in a magnetic field in which a single hard disk device is individually placed, and the box may be placed in the magnetic field. You can also apply a magnetic field to a device with a built-in node disk device. That is, the magnetic field may be applied from the outside of the computer device in a state where it is incorporated in the computer device or the like without removing the hard disk.
- the data erasing apparatus of this embodiment can avoid performing unnecessary erasing processing by monitoring the input voltage and the deterioration state of the capacitor before erasing processing.
- the discharge state of the capacitor 52 by checking the discharge state of the capacitor 52 during the erasing process, it is possible to monitor problems that occur during the erasing process, and even without reading the contents of the hard disk drive, which is a magnetic recording medium, with a computer, It can be judged with certain certainty that it is defective.
- the input voltage and the deterioration state of the capacitor 52 are judged, and if certain conditions are satisfied, it can be inferred with certain certainty that the data recorded on the hard disk drive has been completely erased. Can do.
- a recording data erasing apparatus for a magnetic recording medium is a recycling facility for a magnetic recording medium, an office that consumes and discards the magnetic recording medium, and a commercial facility that collects the magnetic recording medium as a recycling window.
- the data recorded on the magnetic recording medium It can be used when deleting.
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- Recording Or Reproducing By Magnetic Means (AREA)
- Digital Magnetic Recording (AREA)
- Storage Device Security (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/794,259 US20080007859A1 (en) | 2004-12-27 | 2004-12-27 | Recorded Data Eraser for Magnetic Recording Medium, Method for Erasing Recorded Data in Magnetic Recording Medium, and Program for Controlling Said Eraser |
PCT/JP2004/019507 WO2006070435A1 (ja) | 2004-12-27 | 2004-12-27 | 磁気記録媒体の記録データ消去装置、磁気記録媒体の記録データ消去方法、磁気記録媒体の記録データ消去装置を制御するプログラム |
CNA2004800447490A CN101091210A (zh) | 2004-12-27 | 2004-12-27 | 磁记录介质的记录数据擦除器、磁记录介质的记录数据擦除方法和控制磁记录介质的记录数据擦除器的程序 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2004/019507 WO2006070435A1 (ja) | 2004-12-27 | 2004-12-27 | 磁気記録媒体の記録データ消去装置、磁気記録媒体の記録データ消去方法、磁気記録媒体の記録データ消去装置を制御するプログラム |
Publications (1)
Publication Number | Publication Date |
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WO2006070435A1 true WO2006070435A1 (ja) | 2006-07-06 |
Family
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PCT/JP2004/019507 WO2006070435A1 (ja) | 2004-12-27 | 2004-12-27 | 磁気記録媒体の記録データ消去装置、磁気記録媒体の記録データ消去方法、磁気記録媒体の記録データ消去装置を制御するプログラム |
Country Status (3)
Country | Link |
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US (1) | US20080007859A1 (ja) |
CN (1) | CN101091210A (ja) |
WO (1) | WO2006070435A1 (ja) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006070434A1 (ja) * | 2004-12-27 | 2006-07-06 | Orient Instrument Computer Co., Ltd. | データ記録媒体の廃棄処理方法 |
JP2007026574A (ja) * | 2005-07-20 | 2007-02-01 | Orient Sokki Computer Kk | 磁気データ消去装置 |
US20100276063A1 (en) * | 2009-05-02 | 2010-11-04 | Henry Hoang Xuan Bui | Methods of manufacturing quadrupole mass filters |
JP5636733B2 (ja) * | 2009-05-12 | 2014-12-10 | アドバンス・デザイン株式会社 | 磁気データ消去装置 |
CN105022702A (zh) * | 2015-07-02 | 2015-11-04 | 山东超越数控电子有限公司 | 一种快速可销毁hdd硬盘的设计方法 |
CN112837705B (zh) * | 2021-02-25 | 2022-05-17 | 精密电产(北京)科技有限公司 | 一种磁场可逆变的消磁方法 |
Citations (4)
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JPS5555267A (en) * | 1978-10-20 | 1980-04-23 | Yamatake Honeywell Co Ltd | Diagnosis device of analog input device |
JPH01189568A (ja) * | 1988-01-22 | 1989-07-28 | Teac Corp | 電源電圧モニター |
US5959824A (en) * | 1998-03-25 | 1999-09-28 | Data Security, Inc. | Transient magnetic field degaussing system with auto calibration |
JP2002323522A (ja) * | 2001-04-26 | 2002-11-08 | Sumitomo Heavy Ind Ltd | 静電容量を持った素子の寿命監視装置 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US4617603A (en) * | 1985-02-27 | 1986-10-14 | Ixi Laboratories, Inc. | Degaussing system for bulk demagnetization of previously magnetized materials |
US5721665A (en) * | 1995-08-18 | 1998-02-24 | Data Security, Inc. | Modulated magnet field bulk degaussing system |
US6295569B1 (en) * | 1996-05-20 | 2001-09-25 | Fujitsu Limited | Storage apparatus |
JP2001331904A (ja) * | 2000-05-16 | 2001-11-30 | Internatl Business Mach Corp <Ibm> | データ消去装置 |
JP3088608U (ja) * | 2002-03-14 | 2002-09-20 | オリエント測器コンピュータ株式会社 | ハードディスク装置の記録データ消去装置 |
-
2004
- 2004-12-27 US US11/794,259 patent/US20080007859A1/en not_active Abandoned
- 2004-12-27 CN CNA2004800447490A patent/CN101091210A/zh active Pending
- 2004-12-27 WO PCT/JP2004/019507 patent/WO2006070435A1/ja not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5555267A (en) * | 1978-10-20 | 1980-04-23 | Yamatake Honeywell Co Ltd | Diagnosis device of analog input device |
JPH01189568A (ja) * | 1988-01-22 | 1989-07-28 | Teac Corp | 電源電圧モニター |
US5959824A (en) * | 1998-03-25 | 1999-09-28 | Data Security, Inc. | Transient magnetic field degaussing system with auto calibration |
JP2002323522A (ja) * | 2001-04-26 | 2002-11-08 | Sumitomo Heavy Ind Ltd | 静電容量を持った素子の寿命監視装置 |
Also Published As
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CN101091210A (zh) | 2007-12-19 |
US20080007859A1 (en) | 2008-01-10 |
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