CN107143568A - Many reciprocal retaining mechanisms of nut - Google Patents
Many reciprocal retaining mechanisms of nut Download PDFInfo
- Publication number
- CN107143568A CN107143568A CN201710245290.XA CN201710245290A CN107143568A CN 107143568 A CN107143568 A CN 107143568A CN 201710245290 A CN201710245290 A CN 201710245290A CN 107143568 A CN107143568 A CN 107143568A
- Authority
- CN
- China
- Prior art keywords
- nut
- foregoing
- screw rod
- rotate counterclockwise
- aforementioned
- 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
- 230000007246 mechanism Effects 0.000 title claims abstract description 43
- 150000001875 compounds Chemical class 0.000 claims abstract description 10
- 230000003068 static effect Effects 0.000 claims description 18
- 230000014759 maintenance of location Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
- F16B39/12—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B33/00—Features common to bolt and nut
- F16B33/02—Shape of thread; Special thread-forms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
- F16B39/12—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts
- F16B39/16—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts in which the screw-thread of the locknut differs from that of the nut
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B33/00—Features common to bolt and nut
- F16B33/02—Shape of thread; Special thread-forms
- F16B2033/025—Shape of thread; Special thread-forms with left-hand thread
Abstract
A kind of many reciprocal retaining mechanisms of nut of this disclosure of the invention, are related to mechanical field, specifically, belong to a kind of retention mechanism.The purpose of this invention is to provide a kind of reciprocal retaining mechanism of many nuts, to achieve these goals, and this invention includes one section of screw rod；Still include one section of thread segment that turns clockwise being located on foregoing screw rod；Still include one section of rotate counterclockwise thread segment being located on foregoing screw rod；Foregoing turn clockwise thread segment and foregoing rotate counterclockwise thread segment are compound mutually on foregoing screw rod both this to cross one another；Nut, nut two, nut three are still included, this three is fastened on foregoing screw rod；Aforementioned nut, nut two, the respectively left, center, right that put in order of nut three this three, the thread rotary orientation of this three are respectively " rotate counterclockwise, turn clockwise, rotate counterclockwise " or are respectively " turn clockwise, rotate counterclockwise, turn clockwise "；This invention has locking property good, vibrates the benefit for being difficult to fluff and coming off.
Description
Technical field
This invention is related to mechanical field, specifically, belongs to a kind of retention mechanism.
Background technology
In the working environments such as vibration, the nut in bolt is often fluffed, and comes off, and single nut can not be fastened individually
Optional position on one section of screw rod.
The content of the invention
The purpose of this invention is to provide a kind of reciprocal retaining mechanism of many nuts, to achieve these goals, and this invention is used
Following technical scheme：
1st, a kind of reciprocal retaining mechanism of many nuts, it is characterised in that
Include one section of screw rod；
Still include one section of thread segment that turns clockwise being located on foregoing screw rod；
Still include one section of rotate counterclockwise thread segment being located on foregoing screw rod；
Foregoing thread segment and the foregoing rotate counterclockwise thread segment of turning clockwise is compound mutual mutually on foregoing screw rod both this
Intersect；
Still comprising nut-, nut two, nut three, this three is fastened on foregoing screw rod, three's arranged in series and close patch
Close.
Special instruction：Aforementioned nut in this invention, is all the attaching nut of the screw thread in respective threaded rod, must with it is specific
Screw flight is used cooperatively, hereafter all same.
Aforementioned nut-, nut two, the respectively left, center, right that put in order of nut three this three, the screw thread rotation of this three
To be respectively " rotate counterclockwise, turn clockwise, rotate counterclockwise " or be respectively " turn clockwise, rotate counterclockwise, up time
Pin rotates "；
Aforementioned nut-, nut two, nut three this three also jointly comprise a three nuts interconnection unification mechanism, foregoing three nut
Aforementioned nut of the interconnection unification mechanism by arranged in series and after being brought into close contact-, nut two, nut three this three be connected to become
One entirety, prevent " one of nut rotation and two other is static " or prevent " two nut rotations therein and the
Three are static ", ensure aforementioned nut-, nut two, nut three this three must equidirectional rotation or transfixion simultaneously；
After contrary operation by interconnection unification, foregoing three nuts interconnection unification mechanism can will connect into an entirety.
2nd, according to the reciprocal retaining mechanism of many nuts described in technical scheme 1, it is characterised in that
Include one section of screw rod；
Still include one section of thread segment that turns clockwise being located on foregoing screw rod；
Still include one section of rotate counterclockwise thread segment being located on foregoing screw rod；
Foregoing thread segment and the foregoing rotate counterclockwise thread segment of turning clockwise is compound mutual mutually on foregoing screw rod both this
Intersect；
Still comprising nut-, nut two, nut three, this three is fastened on foregoing screw rod, three's arranged in series and close patch
Close.
Special instruction：Aforementioned nut in this invention, is all the attaching nut of the screw thread in respective threaded rod, must with it is specific
Screw flight is used cooperatively, hereafter all same.
Aforementioned nut-, nut two, the respectively left, center, right that put in order of nut three this three, the screw thread rotation of this three
To be respectively " rotate counterclockwise, turn clockwise, rotate counterclockwise " or be respectively " turn clockwise, rotate counterclockwise, up time
Pin rotates "；
Aforementioned nut-, nut two, nut three this three also jointly comprise a three nuts interconnection unification mechanism, foregoing three nut
Aforementioned nut of the interconnection unification mechanism by arranged in series and after being brought into close contact-, nut two, nut three this three be connected to become
One entirety, prevent " one of nut rotation and two other is static " or prevent " two nut rotations therein and the
Three are static ", ensure aforementioned nut-, nut two, nut three this three must equidirectional rotation or transfixion simultaneously；
After contrary operation by interconnection unification, foregoing three nuts interconnection unification mechanism can will connect into an entirety；
The material of the nut one and the nut two, size, hand of spiral is identical；
The material of the nut two and the nut three, size, hand of spiral is identical.
3rd, according to the reciprocal retaining mechanism of many nuts described in technical scheme 1, it is characterised in that
Include one section of screw rod；
Still include one section of thread segment that turns clockwise being located on foregoing screw rod；
Still include one section of rotate counterclockwise thread segment being located on foregoing screw rod；
Foregoing thread segment and the foregoing rotate counterclockwise thread segment of turning clockwise is compound mutual mutually on foregoing screw rod both this
Intersect；
Still comprising nut-, nut two, nut three, this three is fastened on foregoing screw rod, three's arranged in series and close patch
Close.
Special instruction：Aforementioned nut in this invention, is all the attaching nut of the screw thread in respective threaded rod, must with it is specific
Screw flight is used cooperatively, hereafter all same.
Aforementioned nut-, nut two, the respectively left, center, right that put in order of nut three this three, the screw thread rotation of this three
To be respectively " rotate counterclockwise, turn clockwise, rotate counterclockwise " or be respectively " turn clockwise, rotate counterclockwise, up time
Pin rotates "；
Aforementioned nut-, nut two, nut three this three also jointly comprise a three nuts interconnection unification mechanism, foregoing three nut
Aforementioned nut of the interconnection unification mechanism by arranged in series and after being brought into close contact-, nut two, nut three this three be connected to become
One entirety, prevent " one of nut rotation and two other is static " or prevent " two nut rotations therein and the
Three are static ", ensure aforementioned nut-, nut two, nut three this three must equidirectional rotation or transfixion simultaneously；
After contrary operation by interconnection unification, foregoing three nuts interconnection unification mechanism can will connect into an entirety；
The material of the nut one and the nut two, size, hand of spiral is differed；
The material of the nut two and the nut three, size, hand of spiral is differed.
From foregoing teachings, this invention has locking property good, vibrates the benefit for being difficult to fluff and coming off.
Embodiment
The structure of embodiment one is described below：
A kind of reciprocal retaining mechanism of many nuts, it is characterised in that
Include one section of screw rod；
Still include one section of thread segment that turns clockwise being located on foregoing screw rod；
Still include one section of rotate counterclockwise thread segment being located on foregoing screw rod；
Foregoing thread segment and the foregoing rotate counterclockwise thread segment of turning clockwise is compound mutual mutually on foregoing screw rod both this
Intersect；
Still comprising nut-, nut two, nut three, this three is fastened on foregoing screw rod, three's arranged in series and close patch
Close.
Special instruction：Aforementioned nut in this invention, is all the attaching nut of the screw thread in respective threaded rod, must with it is specific
Screw flight is used cooperatively, hereafter all same.
Aforementioned nut-, nut two, the respectively left, center, right that put in order of nut three this three, the screw thread rotation of this three
To be respectively " rotate counterclockwise, turn clockwise, rotate counterclockwise " or be respectively " turn clockwise, rotate counterclockwise, up time
Pin rotates "；
Aforementioned nut-, nut two, nut three this three also jointly comprise a three nuts interconnection unification mechanism, foregoing three nut
Aforementioned nut of the interconnection unification mechanism by arranged in series and after being brought into close contact-, nut two, nut three this three be connected to become
One entirety, prevent " one of nut rotation and two other is static " or prevent " two nut rotations therein and the
Three are static ", ensure aforementioned nut-, nut two, nut three this three must equidirectional rotation or transfixion simultaneously；
After contrary operation by interconnection unification, foregoing three nuts interconnection unification mechanism can will connect into an entirety.
The structure of embodiment two is described below：
A kind of reciprocal retaining mechanism of many nuts, it is characterised in that
Include one section of screw rod；
Still include one section of thread segment that turns clockwise being located on foregoing screw rod；
Still include one section of rotate counterclockwise thread segment being located on foregoing screw rod；
Foregoing thread segment and the foregoing rotate counterclockwise thread segment of turning clockwise is compound mutual mutually on foregoing screw rod both this
Intersect；
Still comprising nut-, nut two, nut three, this three is fastened on foregoing screw rod, three's arranged in series and close patch
Close.
Special instruction：Aforementioned nut in this invention, is all the attaching nut of the screw thread in respective threaded rod, must with it is specific
Screw flight is used cooperatively, hereafter all same.
Aforementioned nut-, nut two, the respectively left, center, right that put in order of nut three this three, the screw thread rotation of this three
To be respectively " rotate counterclockwise, turn clockwise, rotate counterclockwise " or be respectively " turn clockwise, rotate counterclockwise, up time
Pin rotates "；
Aforementioned nut-, nut two, nut three this three also jointly comprise a three nuts interconnection unification mechanism, foregoing three nut
Aforementioned nut of the interconnection unification mechanism by arranged in series and after being brought into close contact-, nut two, nut three this three be connected to become
One entirety, prevent " one of nut rotation and two other is static " or prevent " two nut rotations therein and the
Three are static ", ensure aforementioned nut-, nut two, nut three this three must equidirectional rotation or transfixion simultaneously；
After contrary operation by interconnection unification, foregoing three nuts interconnection unification mechanism can will connect into an entirety；
The material of the nut one and the nut two, size, hand of spiral is identical；
The material of the nut two and the nut three, size, hand of spiral is identical.
The structure of embodiment three is described below：
A kind of reciprocal retaining mechanism of many nuts, it is characterised in that
Include one section of screw rod；
Still include one section of thread segment that turns clockwise being located on foregoing screw rod；
Still include one section of rotate counterclockwise thread segment being located on foregoing screw rod；
Foregoing thread segment and the foregoing rotate counterclockwise thread segment of turning clockwise is compound mutual mutually on foregoing screw rod both this
Intersect；
Still comprising nut-, nut two, nut three, this three is fastened on foregoing screw rod, three's arranged in series and close patch
Close.
Special instruction：Aforementioned nut in this invention, is all the attaching nut of the screw thread in respective threaded rod, must with it is specific
Screw flight is used cooperatively, hereafter all same.
Aforementioned nut-, nut two, the respectively left, center, right that put in order of nut three this three, the screw thread rotation of this three
To be respectively " rotate counterclockwise, turn clockwise, rotate counterclockwise " or be respectively " turn clockwise, rotate counterclockwise, up time
Pin rotates "；
Aforementioned nut-, nut two, nut three this three also jointly comprise a three nuts interconnection unification mechanism, foregoing three nut
Aforementioned nut of the interconnection unification mechanism by arranged in series and after being brought into close contact-, nut two, nut three this three be connected to become
One entirety, prevent " one of nut rotation and two other is static " or prevent " two nut rotations therein and the
Three are static ", ensure aforementioned nut-, nut two, nut three this three must equidirectional rotation or transfixion simultaneously；
After contrary operation by interconnection unification, foregoing three nuts interconnection unification mechanism can will connect into an entirety；
The material of the nut one and the nut two, size, hand of spiral is differed；
The material of the nut two and the nut three, size, hand of spiral is differed.
Claims (9)
1. a kind of reciprocal retaining mechanism of many nuts, it is characterised in that
Include one section of screw rod；
Still include one section of thread segment that turns clockwise being located on foregoing screw rod；
Still include one section of rotate counterclockwise thread segment being located on foregoing screw rod；
Foregoing thread segment and the foregoing rotate counterclockwise thread segment of turning clockwise is compound mutual mutually on foregoing screw rod both this
Intersect；
Still comprising nut-, nut two, nut three, this three is fastened on foregoing screw rod, three's arranged in series and close patch
Close.
2. special instruction：Aforementioned nut in this invention, is all the attaching nut of the screw thread in respective threaded rod, must be with specific spiral shell
Bar screw thread is used cooperatively, hereafter all same.
3. aforementioned nut-, nut two, the respectively left, center, right that put in order of nut three this three, the thread rotary orientation of this three
Respectively " rotate counterclockwise, turn clockwise, rotate counterclockwise " or be respectively " turn clockwise, rotate counterclockwise, clockwise
Rotation "；
Aforementioned nut-, nut two, nut three this three also jointly comprise a three nuts interconnection unification mechanism, foregoing three nut
Aforementioned nut of the interconnection unification mechanism by arranged in series and after being brought into close contact-, nut two, nut three this three be connected to become
One entirety, prevent " one of nut rotation and two other is static " or prevent " two nut rotations therein and the
Three are static ", ensure aforementioned nut-, nut two, nut three this three must equidirectional rotation or transfixion simultaneously；
After contrary operation by interconnection unification, foregoing three nuts interconnection unification mechanism can will connect into an entirety.
4. according to the reciprocal retaining mechanism of many nuts described in claim 1, it is characterised in that
Include one section of screw rod；
Still include one section of thread segment that turns clockwise being located on foregoing screw rod；
Still include one section of rotate counterclockwise thread segment being located on foregoing screw rod；
Foregoing thread segment and the foregoing rotate counterclockwise thread segment of turning clockwise is compound mutual mutually on foregoing screw rod both this
Intersect；
Still comprising nut-, nut two, nut three, this three is fastened on foregoing screw rod, three's arranged in series and close patch
Close.
5. special instruction：Aforementioned nut in this invention, is all the attaching nut of the screw thread in respective threaded rod, must be with specific spiral shell
Bar screw thread is used cooperatively, hereafter all same.
6. aforementioned nut-, nut two, the respectively left, center, right that put in order of nut three this three, the thread rotary orientation of this three
Respectively " rotate counterclockwise, turn clockwise, rotate counterclockwise " or be respectively " turn clockwise, rotate counterclockwise, clockwise
Rotation "；
Aforementioned nut-, nut two, nut three this three also jointly comprise a three nuts interconnection unification mechanism, foregoing three nut
Aforementioned nut of the interconnection unification mechanism by arranged in series and after being brought into close contact-, nut two, nut three this three be connected to become
One entirety, prevent " one of nut rotation and two other is static " or prevent " two nut rotations therein and the
Three are static ", ensure aforementioned nut-, nut two, nut three this three must equidirectional rotation or transfixion simultaneously；
After contrary operation by interconnection unification, foregoing three nuts interconnection unification mechanism can will connect into an entirety；
The material of the nut one and the nut two, size, hand of spiral is identical；
The material of the nut two and the nut three, size, hand of spiral is identical.
7. according to the reciprocal retaining mechanism of many nuts described in claim 1, it is characterised in that
Include one section of screw rod；
Still include one section of thread segment that turns clockwise being located on foregoing screw rod；
Still include one section of rotate counterclockwise thread segment being located on foregoing screw rod；
Foregoing thread segment and the foregoing rotate counterclockwise thread segment of turning clockwise is compound mutual mutually on foregoing screw rod both this
Intersect；
Still comprising nut-, nut two, nut three, this three is fastened on foregoing screw rod, three's arranged in series and close patch
Close.
8. special instruction：Aforementioned nut in this invention, is all the attaching nut of the screw thread in respective threaded rod, must be with specific spiral shell
Bar screw thread is used cooperatively, hereafter all same.
9. aforementioned nut-, nut two, the respectively left, center, right that put in order of nut three this three, the thread rotary orientation of this three
Respectively " rotate counterclockwise, turn clockwise, rotate counterclockwise " or be respectively " turn clockwise, rotate counterclockwise, clockwise
Rotation "；
Aforementioned nut-, nut two, nut three this three also jointly comprise a three nuts interconnection unification mechanism, foregoing three nut
Aforementioned nut of the interconnection unification mechanism by arranged in series and after being brought into close contact-, nut two, nut three this three be connected to become
One entirety, prevent " one of nut rotation and two other is static " or prevent " two nut rotations therein and the
Three are static ", ensure aforementioned nut-, nut two, nut three this three must equidirectional rotation or transfixion simultaneously；
After contrary operation by interconnection unification, foregoing three nuts interconnection unification mechanism can will connect into an entirety；
The material of the nut one and the nut two, size, hand of spiral is differed；
The material of the nut two and the nut three, size, hand of spiral is differed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710245290.XA CN107143568A (en) | 2017-04-14 | 2017-04-14 | Many reciprocal retaining mechanisms of nut |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710245290.XA CN107143568A (en) | 2017-04-14 | 2017-04-14 | Many reciprocal retaining mechanisms of nut |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107143568A true CN107143568A (en) | 2017-09-08 |
Family
ID=59774757
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710245290.XA Pending CN107143568A (en) | 2017-04-14 | 2017-04-14 | Many reciprocal retaining mechanisms of nut |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107143568A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2160790Y (en) * | 1993-05-12 | 1994-04-06 | 林清富 | Screw thread jointing part with reverse thread double nut locking structure |
| CN201187512Y (en) * | 2008-05-16 | 2009-01-28 | 韩胜震 | Double-rotary anti-drop screw |
| CN201606384U (en) * | 2010-02-10 | 2010-10-13 | 姚乐 | Reinforcing screw with forward and reverse screw threads |
| CN104196865A (en) * | 2014-09-25 | 2014-12-10 | 胡鑫 | Anti-looseness interlocking and fastening device with irregularly-shaped ratchet pad for high-speed-rail contact net |
| US20150219144A1 (en) * | 2014-01-31 | 2015-08-06 | Kaoru Taneichi | Fastening device |
| CN205715164U (en) * | 2016-04-12 | 2016-11-23 | 中国第一汽车股份有限公司 | Self-locking type check bolt assembly |
| CN106555804A (en) * | 2015-09-30 | 2017-04-05 | 农立艳 | The anti-loose bolt of bar body ladder tube reducing |
| CN106939915A (en) * | 2016-01-04 | 2017-07-11 | 廖奕熙 | With reciprocal two nuts fastening apparatus |
| CN107143564A (en) * | 2016-07-30 | 2017-09-08 | 徐建俭 | Include the retention mechanism of plus thread and left-hand thread simultaneously |
-
2017
- 2017-04-14 CN CN201710245290.XA patent/CN107143568A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2160790Y (en) * | 1993-05-12 | 1994-04-06 | 林清富 | Screw thread jointing part with reverse thread double nut locking structure |
| CN201187512Y (en) * | 2008-05-16 | 2009-01-28 | 韩胜震 | Double-rotary anti-drop screw |
| CN201606384U (en) * | 2010-02-10 | 2010-10-13 | 姚乐 | Reinforcing screw with forward and reverse screw threads |
| US20150219144A1 (en) * | 2014-01-31 | 2015-08-06 | Kaoru Taneichi | Fastening device |
| CN104196865A (en) * | 2014-09-25 | 2014-12-10 | 胡鑫 | Anti-looseness interlocking and fastening device with irregularly-shaped ratchet pad for high-speed-rail contact net |
| CN106555804A (en) * | 2015-09-30 | 2017-04-05 | 农立艳 | The anti-loose bolt of bar body ladder tube reducing |
| CN106939915A (en) * | 2016-01-04 | 2017-07-11 | 廖奕熙 | With reciprocal two nuts fastening apparatus |
| CN205715164U (en) * | 2016-04-12 | 2016-11-23 | 中国第一汽车股份有限公司 | Self-locking type check bolt assembly |
| CN107143564A (en) * | 2016-07-30 | 2017-09-08 | 徐建俭 | Include the retention mechanism of plus thread and left-hand thread simultaneously |
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Application publication date: 20170908 |
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