CN107783233A - Optical cable - Google Patents
Optical cable Download PDFInfo
- Publication number
- CN107783233A CN107783233A CN201710984264.9A CN201710984264A CN107783233A CN 107783233 A CN107783233 A CN 107783233A CN 201710984264 A CN201710984264 A CN 201710984264A CN 107783233 A CN107783233 A CN 107783233A
- Authority
- CN
- China
- Prior art keywords
- optical cable
- optical fiber
- optical
- simulation
- main body
- 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.)
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/08—Testing mechanical properties
- G01M11/088—Testing mechanical properties of optical fibres; Mechanical features associated with the optical testing of optical fibres
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4479—Manufacturing methods of optical cables
- G02B6/4483—Injection or filling devices
Abstract
The invention discloses a kind of optical cable, including：First optical fiber, sheath and optical cable lose analog component；Sheath is coated on fiber outer surface；Fine cream is also filled between first optical fiber and sheath；Optical cable, which loses analog component, includes simulation optical cable part, Temperature Humidity Sensor, pressure sensor and connector；The simulation optical cable part includes simulation optical cable main body and a pair of seal heads positioned at simulation optical cable main body both ends；Simulation optical cable main body includes the second optical fiber, and surrounding layer is cased with outside the second fiber outer surface；The simulation optical cable part both ends have the outer circular edge of evagination, and the outer circular edge coordinates with sealing head thread, and silica gel margin is provided with the inside of outer circular edge.The present invention loses analog component by being installed additional on optical cable for simulating the optical cable of the first optical fiber and its sheath, and install Temperature Humidity Sensor and pressure sensor additional in simulation optical cable main body, for detecting tension force, and second optical fiber optical property, be easy on the spot or the optical fiber of online evaluation first damage.
Description
Technical field
The present invention relates to fiber optic cable manufacture field, and in particular to a kind of optical cable.
Background technology
With the continuous development of optical communication technique and industry, optical sensing replace conditional electronic sensing technology colliery,
The industry-by-industries such as electric power, security against fire and people's livelihood field, which are obtained for, to be widely applied.Fibre optical sensor senses with conditional electronic
Device compares, and has a series of advantage：High sensitivity, corrosion-resistant, transmission capacity is big, anti-electromagnetic interference capability is strong, structure is simple
Just, small volume, in light weight, little power consumption etc..Optical cable (optical fiber cable) is to meet optics, machinery or environment
Performance specification and manufacture, it is to be used as transmission medium and can be single by the use of one or more optical fiber being placed in cladding sheath
The communications cable component used solely or in groups.Optical cable is mainly by optical fiber (thin such as the glass fiber of hair) and plastic protective sleeve
Pipe and plastic peel are formed, and do not have the metals such as gold, silver, copper aluminium, general non-recovery value in optical cable.Optical cable is a number of light
It is fine to form the cable heart according to certain way, sheath, some also cladding outer jackets, to realize that one kind of optical signal transmission is led to are surrounded by outside
Believe circuit.I.e.：The cable formed by optical fiber (optical transmission carrier) by certain technique.The basic structure of optical cable be usually by
Cable core, strengthen several parts compositions such as steel wire, filler and sheath, according further to needing to be additionally provided with solvent layer, cushion, insulation
The components such as plain conductor.
Existing optical cable, using optical fiber hydrogen loss easily occurs, is generally required to one in the region that some temperature are high, humidity is high
Determine region reload temperature, moisture control unit, but sixty-four dollar question is can not to assess optical cable under rugged environment, it is local
Optical fiber damage；The situation that optical cable is often bent in use simultaneously, more than the bending meeting of certain limit
Influence the performance of optical fiber, can damage as online evaluation on the spot, equally directly affect the service life of optical cable.
The content of the invention
For the present invention in view of the above-mentioned problems, proposing a kind of optical cable, solving existing optical cable can not the generation of on-the-ground assessment optical fiber
Hydrogen loss and the defects of losing rear damage.
The technical scheme that the present invention takes is as follows：
A kind of optical cable, including：First optical fiber, sheath and optical cable lose analog component；Sheath is coated on fiber outer surface；Institute
State and fine cream is also filled between the first optical fiber and sheath；
The optical cable, which loses analog component, includes simulation optical cable part, Temperature Humidity Sensor, pressure sensor and connector；Institute
Stating simulation optical cable part includes simulation optical cable main body and a pair of seal heads positioned at simulation optical cable main body both ends；The simulation optical cable master
Body includes the second optical fiber, and surrounding layer is cased with outside second fiber outer surface；Temperature Humidity Sensor and the pressure sensor peace
Mounted in the lower end of surrounding layer, and the data wire of the second optical fiber, Temperature Humidity Sensor and the data wire of pressure sensor stretch out respectively
Simulate the both sides end face of optical cable main body, the simulation optical cable part both ends have an outer circular edge of evagination, the outer circular edge with it is close
End socket screw thread coordinates, and is provided with silica gel margin on the inside of the outer circular edge, the first end of silicagel pad has the cambered surface of indent, separately
One end has the first groove being adapted with the second optical fiber and the second groove being adapted with data wire；First optical fiber and
Two optical fiber are identical optical fiber；
The connector is to include being enclosed on the dead ring of jacket outer surface and connection dead ring outside and simulate consolidating for optical cable part
Determine part, the dead ring is provided with clamping part and what is be adapted with clamping part be snapped portion.The present invention on optical cable by installing additional
Optical cable for simulating the first optical fiber and its sheath loses analog component, and installs Temperature Humidity Sensor additional in simulation optical cable main body
And pressure sensor, for detecting in bending, and in high-temperature, high humidity regions, described in optical cable in humiture or
Generation bending produces tension force, and the optical property of the second optical fiber；So that the situation of optical cable is not being taken apart by detecting simulated light
Cable part, on the spot or the optical fiber of online evaluation first damage.
Optionally, the simulation optical cable main body both ends have the sealing block being connected with surrounding layer, have on the sealing block
The through hole for being easy to the second optical fiber to pass through.
Optionally, the thickness of the surrounding layer is 0.8-1.0 times of jacket thickness.
Optionally, fine cream is also coated between the surrounding layer and the second optical fiber.
Optionally, the dynamic viscosity of the fine cream is more than or equal to 4000mpas.
Optionally, the flammable index of the fine cream is more than or equal to 300 DEG C.Set the dynamic viscosity of the fine cream be more than or
Flammable index equal to 4000mpas, and the fine cream is more than or equal to 300 DEG C.Optical fiber is further increased in high humility
With the service life and fire resistance of the environment of high-temperature.
Optionally, the cambered surface bottom of the silica gel margin has smooth circular platform；The cambered surface week of the silica gel margin
The increasing with evagination rubs part on wall.
Optionally, the increasing rubs, and spiral dissipates arrangement to part from inside to outside.Take smooth circular platform and from inside to outside
The increasing of spiral diverging arrangement rubs part, and increasing rubs fingerprint of the part on finger, adds frictional force, is easy to user deeply single
Individual finger takes out silica gel margin.
Optionally, the cambered surface maximum outside diameter of the silica gel margin is more than or equal to 2.5cm.
The beneficial effects of the invention are as follows：The present invention on optical cable by installing the light for simulating the first optical fiber and its sheath additional
Cable loses analog component, and installs Temperature Humidity Sensor and pressure sensor additional in simulation optical cable main body, is being bent for detecting
When, in humiture or bending occurs produce tension force, and the second light and in high-temperature, high humidity regions, described in optical cable
Fine optical property；So that simulate optical cable part by detecting not taking the situation of optical cable apart, on the spot or online evaluation first
The damage of optical fiber.
In addition, the dynamic viscosity of the fine cream is set to be more than or equal to 4000mpas, and the flammable finger of the fine cream 9
Number is more than or equal to 300 DEG C.Optical fiber is further increased in high humility and the service life of the environment of high-temperature.Due to fine cream one
As belong to flammable combustible material, be also easy to cause potential safety hazard；The flammable index of fine cream is more than or equal to 300 DEG C, improves it
Fire resistance.
The increasing of smooth circular platform and the arrangement of spiral diverging from inside to outside is taken to rub part, increasing rubs part perpendicular to finger
On fingerprint, add frictional force, be easy to user to go deep into single finger and take out silica gel margin.
Brief description of the drawings：
Fig. 1 is the structural representation of the optical cable of the embodiment of the present invention one；
Fig. 2 is that the optical cable of the optical cable of the embodiment of the present invention one loses analog component cross-sectional view；
Fig. 3 is the silicagel pad end surface structural representation of the optical cable of the embodiment of the present invention one；
Fig. 4 is the dead ring deployed configuration schematic diagram of the optical cable of the embodiment of the present invention one；
Fig. 5 is that the optical cable of the optical cable of the embodiment of the present invention two loses analog component cross-sectional view.
Each reference is in figure：
1st, the first optical fiber；2nd, sheath；3rd, optical cable loses analog component；4th, optical cable part is simulated；5th, Temperature Humidity Sensor；6th, press
Force snesor；7th, optical cable main body is simulated；8th, seal head；9th, fine cream；10th, the second optical fiber；11st, surrounding layer；12nd, data wire；13rd, ring
Shape outer rim；14th, silica gel margin；15th, the first groove；16th, the second groove；17th, sealing block；18th, dead ring；19th, fixture；20、
Clamping part；21st, it is snapped portion；22nd, through hole；23rd, circular platform；24th, the part that rubs is increased；25th, connector.
Embodiment：
With reference to each accompanying drawing, the present invention is described in detail.
The dynamic viscosity of fine cream refers in 25 DEG C, D=50S in the present invention-1Under conditions of data.
Embodiment one：The invention discloses a kind of optical cable (see accompanying drawing 1,2,3,4), including：First optical fiber 1, sheath 2 and light
Cable loses analog component 3；Sheath 2 is coated on fiber outer surface；Fine cream 9 is also filled between first optical fiber 1 and sheath 2；
The optical cable, which loses analog component 3, includes simulation optical cable part 4, Temperature Humidity Sensor 5, pressure sensor 6 and connection
Part 25；The simulation optical cable part 4 includes simulation optical cable main body 7 and a pair of seal heads 8 positioned at simulation optical cable main body 7 both ends；Institute
Stating simulation optical cable main body 7 includes the second optical fiber 10, and surrounding layer 11 is cased with outside the outer surface of the second optical fiber 10；The humiture passes
Sensor 5 and pressure sensor 6 are arranged on the lower end of surrounding layer 11, and the and of data wire 12 of the second optical fiber 10, Temperature Humidity Sensor 5
The data wire 12 of pressure sensor 6 stretches out the both sides end face of simulation optical cable main body 7 respectively, and the both ends of simulation optical cable part 4 have
The outer circular edge 13 of evagination, the outer circular edge 13 coordinate with the screw thread of seal head 8, and the inner side of outer circular edge 13 is provided with silica gel
Margin 14, described one end of silica gel margin 14 have the cambered surface of indent, and the other end has first be adapted with the second optical fiber 10 recessed
Groove 15 and the second groove 16 being adapted with data wire 12；The optical fiber 10 of first optical fiber 1 and second is identical optical fiber；
The connector 25 is to include being enclosed on the dead ring 18 of the outer surface of sheath 2 and connection dead ring 18 and simulation optical cable outside
The fixture 19 of part 4, the dead ring 18 is provided with clamping part 20 and what is be adapted with clamping part 20 be snapped portion 21.The present invention
Analog component 3 is lost for simulating the optical cable of the first optical fiber 1 and its sheath 2 by being installed additional on optical cable, and in simulation optical cable master
Temperature Humidity Sensor 5 and pressure sensor 6 are installed in body 7 additional, for detecting in bending, and in high-temperature, high humility area
Domain, in humiture or bending occurs produce tension force, and the optical property of the second optical fiber 10 described in optical cable；So that do not taking apart
The situation of optical cable by detecting simulation optical cable part 4, on the spot or the first optical fiber of online evaluation 1 damage.
Sheath 2 and surrounding layer 11 use phase same material PVC in the present invention.Clamping part 20 uses fixture block, quilt in the present invention
Clamping part 21 uses neck.Connector 25 loses analog component 3 by viscose connection fixture 19 and optical cable.Outer circular edge 13 is viscous
It is attached on the end face of surrounding layer 11.
Wherein, the both ends of simulation optical cable main body 7 have a sealing block 17 being connected with surrounding layer 11, on the sealing block 17
With the through hole 22 for being easy to the second optical fiber 10 to pass through.
Wherein, the thickness of the surrounding layer 11 is 0.8-1.0 times of the thickness of sheath 2.Wherein, the surrounding layer 11 and second
Fine cream 9 is also coated between optical fiber 10.Wherein, the dynamic viscosity of the fine cream 9 is more than or equal to 4000mpas.Wherein, institute
The flammable index for stating fine cream 9 is more than or equal to 300 DEG C.The dynamic viscosity of the fine cream 9 is set to be more than or equal to 4000mpas,
And the flammable index of the fine cream 9 is more than or equal to 300 DEG C.Optical fiber is further increased in high humility and the environment of high-temperature
Service life and fire resistance.
Wherein, the cambered surface bottom of the silica gel margin 14 has smooth circular platform 23；The arc of the silica gel margin 14
The increasing with evagination rubs part 24 on the perisporium of face.Wherein, the increasing rubs, and spiral dissipates arrangement to part 24 from inside to outside.Wherein, institute
The cambered surface maximum outside diameter for stating silica gel margin 14 is more than or equal to 2.5cm.Take smooth circular platform 23 and spiral is sent out from inside to outside
Spread the increasing put to rub part 24, increasing rubs fingerprint of the part 24 on finger, adds frictional force, is easy to user to go deep into single
Finger takes out silica gel margin 14.
Embodiment 2：The invention discloses a kind of optical cable (see accompanying drawing 5), including：First optical fiber 1, sheath 2 and optical cable are lost
Analog component 3；Sheath 2 is coated on fiber outer surface；Fine cream 9 is also filled between first optical fiber 1 and sheath 2；
The optical cable, which loses analog component 3, includes simulation optical cable part 4, Temperature Humidity Sensor 5, pressure sensor 6 and connection
Part 25；The simulation optical cable part 4 includes simulation optical cable main body 7 and a pair of seal heads 8 positioned at simulation optical cable main body 7 both ends；Institute
Stating simulation optical cable main body 7 includes the second optical fiber 10, and surrounding layer 11 is cased with outside the outer surface of the second optical fiber 10；The humiture passes
Sensor 5 and pressure sensor 6 are arranged in the sheath 2 of upper end, and the both ends of simulation optical cable part 4 have the outer circular edge of evagination
13, the outer circular edge 13 coordinates with the screw thread of seal head 8, and the inner side of outer circular edge 13 is provided with silica gel margin 14, the silicon
First 14 one end of rubber cushion has the cambered surface of indent, and the other end has the first groove 15 and and data wire being adapted with the second optical fiber 10
12 the second grooves 16 being adapted；The optical fiber 10 of first optical fiber 1 and second is identical optical fiber；
The connector 25 is to include overcoat in the dead ring 18 of the outer surface of surrounding layer 11 and connection dead ring 18 and simulation
The fixture 19 of optical cable part 4, the dead ring 18 is provided with clamping part 20 and what is be adapted with clamping part 20 be snapped portion 21.The
The data wire 12 of two optical fiber 10, the data wire 12 of Temperature Humidity Sensor 5 and pressure sensor 6 is each passed through dead ring 18 and fixed
Part 19 and the both sides end face for stretching out simulation optical cable main body 7.
When the present invention is implemented, Risk Assessment Report is evaluated according to the use environment to optical cable, in high humiture or bending
Place installs optical cable additional and loses analog component, in monitoring, dismantles seal head, and the optical of the second optical fiber is tested using detection device
Can, and the numerical value of Temperature Humidity Sensor and pressure sensor.
The preferred embodiments of the present invention are the foregoing is only, not thereby limit the scope of patent protection of the present invention, it is all
It is the equivalent structure transformation made with description of the invention and accompanying drawing content, is directly or indirectly used in other related technologies
Field, similarly include within the scope of the present invention.
Claims (9)
- A kind of 1. optical cable, it is characterised in that including：First optical fiber, sheath and optical cable lose analog component；Sheath is coated on optical fiber Outer surface；Fine cream is also filled between first optical fiber and sheath；The optical cable, which loses analog component, includes simulation optical cable part, Temperature Humidity Sensor, pressure sensor and connector；The mould Intending optical cable part includes simulation optical cable main body and a pair of seal heads positioned at simulation optical cable main body both ends；The simulation optical cable main body bag The second optical fiber is included, surrounding layer is cased with outside second fiber outer surface；The Temperature Humidity Sensor and pressure sensor are arranged on The lower end of surrounding layer, and the data wire of the data wire of the second optical fiber, Temperature Humidity Sensor and pressure sensor stretches out simulation respectively The both sides end face of optical cable main body, the simulation optical cable part both ends have the outer circular edge of evagination, the outer circular edge and seal head Screw thread coordinates, and is provided with silica gel margin on the inside of the outer circular edge, the first end of silicagel pad has the cambered surface of indent, the other end With the first groove being adapted with the second optical fiber and the second groove being adapted with data wire；First optical fiber and the second light Fibre is identical optical fiber；The connector is to include overcoat in the dead ring of surrounding layer outer surface and connection dead ring and the fixation for simulating optical cable part Part, the dead ring is provided with clamping part and what is be adapted with clamping part be snapped portion.
- 2. optical cable as claimed in claim 1, it is characterised in that the simulation optical cable main body both ends have what is be connected with surrounding layer Sealing block, have on the sealing block and be easy to the through hole that the second optical fiber passes through.
- 3. optical cable as claimed in claim 2, it is characterised in that the thickness of the surrounding layer is 0.8-1.0 times of jacket thickness.
- 4. optical cable as claimed in claim 3, it is characterised in that fine cream is also coated between the surrounding layer and the second optical fiber.
- 5. the optical cable as described in Claims 1-4 any one claim, it is characterised in that the dynamic viscosity of the fine cream More than or equal to 4000mpas.
- 6. the optical cable as described in Claims 1-4 any one claim, it is characterised in that the flammable index of the fine cream More than or equal to 300 DEG C.
- 7. optical cable as claimed in claim 6, it is characterised in that the cambered surface bottom of the silica gel margin has smooth circular flat Platform；The increasing with evagination rubs part on the cambered surface perisporium of the silica gel margin.
- 8. optical cable as claimed in claim 7, it is characterised in that the increasing rubs, and spiral dissipates arrangement to part from inside to outside.
- 9. optical cable as claimed in claim 8, it is characterised in that the cambered surface maximum outside diameter of the silica gel margin is more than or equal to 2.5cm。
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710984264.9A CN107783233B (en) | 2017-10-20 | 2017-10-20 | Optical cable |
| CN201910543611.3A CN110398807B (en) | 2017-10-20 | 2017-10-20 | Optical cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710984264.9A CN107783233B (en) | 2017-10-20 | 2017-10-20 | Optical cable |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910543611.3A Division CN110398807B (en) | 2017-10-20 | 2017-10-20 | Optical cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107783233A true CN107783233A (en) | 2018-03-09 |
| CN107783233B CN107783233B (en) | 2019-08-02 |
Family
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910543611.3A Active CN110398807B (en) | 2017-10-20 | 2017-10-20 | Optical cable |
| CN201710984264.9A Active CN107783233B (en) | 2017-10-20 | 2017-10-20 | Optical cable |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910543611.3A Active CN110398807B (en) | 2017-10-20 | 2017-10-20 | Optical cable |
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| Country | Link |
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| CN (2) | CN110398807B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111207361A (en) * | 2018-11-22 | 2020-05-29 | Zkw集团有限责任公司 | Device for generating and radiating light |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110824645B (en) * | 2019-11-27 | 2021-07-20 | 国网河南省电力公司南阳供电公司 | Intelligent optical cable with self-sensing function |
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| CN1609645A (en) * | 2004-11-25 | 2005-04-27 | 长飞光纤光缆有限公司 | Mixed optical cable with sensing and communication function and producing method thereof |
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| CN205139433U (en) * | 2015-10-22 | 2016-04-06 | 中国船舶重工集团公司第七一五研究所 | A distributing type optical cable of meeting an emergency for monitoring of structure surface strain |
| CN105974544A (en) * | 2016-07-25 | 2016-09-28 | 长飞光纤光缆股份有限公司 | Sensing-communication composite optical cable |
| WO2017001826A1 (en) * | 2015-06-29 | 2017-01-05 | Optasense Holdings Limited | Monitoring of power cables with distributed fibre optic sensing |
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| CN102401702A (en) * | 2010-09-10 | 2012-04-04 | 北京蔚蓝仕科技有限公司 | Temperature sensing probe for fiber bragg grating |
| US10133017B2 (en) * | 2015-08-07 | 2018-11-20 | Pgs Geophysical As | Vented optical tube |
| CN107086071B (en) * | 2017-05-27 | 2023-07-28 | 渝丰科技股份有限公司 | Monitoring cable |
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|---|---|---|---|---|
| CN1609645A (en) * | 2004-11-25 | 2005-04-27 | 长飞光纤光缆有限公司 | Mixed optical cable with sensing and communication function and producing method thereof |
| CN201765351U (en) * | 2010-05-18 | 2011-03-16 | 华北电力大学（保定） | Seawater temperature profile measuring optical cable based on FBG (fiber bragg grating) principle |
| CN202196210U (en) * | 2011-08-11 | 2012-04-18 | 江苏亨通光电股份有限公司 | Multifunctional induction optical cable |
| WO2017001826A1 (en) * | 2015-06-29 | 2017-01-05 | Optasense Holdings Limited | Monitoring of power cables with distributed fibre optic sensing |
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| CN105974544A (en) * | 2016-07-25 | 2016-09-28 | 长飞光纤光缆股份有限公司 | Sensing-communication composite optical cable |
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| CN111207361A (en) * | 2018-11-22 | 2020-05-29 | Zkw集团有限责任公司 | Device for generating and radiating light |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110398807B (en) | 2020-07-03 |
| CN107783233B (en) | 2019-08-02 |
| CN110398807A (en) | 2019-11-01 |
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