DE2120744A1 - Verfahren zum Messen der Dielektrizi tatskonstante - Google Patents
Verfahren zum Messen der Dielektrizi tatskonstanteInfo
- Publication number
- DE2120744A1 DE2120744A1 DE19712120744 DE2120744A DE2120744A1 DE 2120744 A1 DE2120744 A1 DE 2120744A1 DE 19712120744 DE19712120744 DE 19712120744 DE 2120744 A DE2120744 A DE 2120744A DE 2120744 A1 DE2120744 A1 DE 2120744A1
- Authority
- DE
- Germany
- Prior art keywords
- water
- dielectric constant
- oil
- mhz
- capacitance
- 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.)
- Ceased
Links
- 238000000034 method Methods 0.000 title claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 51
- 239000000523 sample Substances 0.000 claims description 26
- 239000006185 dispersion Substances 0.000 claims description 17
- 239000010779 crude oil Substances 0.000 claims description 16
- 239000012535 impurity Substances 0.000 claims description 15
- 239000000839 emulsion Substances 0.000 claims description 13
- 230000000694 effects Effects 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 11
- 238000010521 absorption reaction Methods 0.000 claims description 7
- 239000004927 clay Substances 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 239000003921 oil Substances 0.000 description 28
- 238000005259 measurement Methods 0.000 description 13
- 239000007762 w/o emulsion Substances 0.000 description 7
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 5
- 229910052901 montmorillonite Inorganic materials 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 239000000356 contaminant Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000009969 flowable effect Effects 0.000 description 3
- 229910052900 illite Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- VGIBGUSAECPPNB-UHFFFAOYSA-L nonaaluminum;magnesium;tripotassium;1,3-dioxido-2,4,5-trioxa-1,3-disilabicyclo[1.1.1]pentane;iron(2+);oxygen(2-);fluoride;hydroxide Chemical compound [OH-].[O-2].[O-2].[O-2].[O-2].[O-2].[F-].[Mg+2].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[K+].[K+].[K+].[Fe+2].O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2 VGIBGUSAECPPNB-UHFFFAOYSA-L 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 229910052622 kaolinite Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 101100189378 Caenorhabditis elegans pat-3 gene Proteins 0.000 description 1
- 101150082208 DIABLO gene Proteins 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- -1 aluminum silicates Chemical class 0.000 description 1
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 1
- 229910052601 baryte Inorganic materials 0.000 description 1
- 239000010428 baryte Substances 0.000 description 1
- 238000007630 basic procedure Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/088—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices operating with electric fields
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/221—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance by investigating the dielectric properties
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2617—Measuring dielectric properties, e.g. constants
- G01R27/2635—Sample holders, electrodes or excitation arrangements, e.g. sensors or measuring cells
- G01R27/2676—Probes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/221—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance by investigating the dielectric properties
- G01N2027/222—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance by investigating the dielectric properties for analysing gases
Landscapes
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Remote Sensing (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Electrochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Electromagnetism (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geophysics (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US5002270A | 1970-06-26 | 1970-06-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE2120744A1 true DE2120744A1 (de) | 1971-12-30 |
Family
ID=21962977
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19712120744 Ceased DE2120744A1 (de) | 1970-06-26 | 1971-04-28 | Verfahren zum Messen der Dielektrizi tatskonstante |
Country Status (6)
| Country | Link |
|---|---|
| US (2) | US3675121A (enExample) |
| JP (1) | JPS471248A (enExample) |
| CA (1) | CA921118A (enExample) |
| DE (1) | DE2120744A1 (enExample) |
| FR (1) | FR2096502B1 (enExample) |
| GB (1) | GB1331327A (enExample) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0080632A1 (en) * | 1981-11-17 | 1983-06-08 | Nissan Motor Co., Ltd. | Oil deterioration detector |
| DE3438932A1 (de) * | 1984-10-24 | 1986-04-24 | Schaller-Automation Industrielle Automationstechnik KG, 6653 Blieskastel | Betriebsmess-verfahren und -geraet zur bestimmung der qualitaet von fluessigen brennstoffen und oelen |
| DE8707954U1 (de) * | 1987-06-04 | 1988-10-06 | Kohler, Hans-Michael, 8022 Zürich | Kapazitiver Messwertaufnehmer |
Families Citing this family (55)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU529348B2 (en) * | 1977-10-07 | 1983-06-02 | Schlumberger Technology B.V. | Means for determining characteristics of subsurface formations |
| US4233839A (en) * | 1979-01-15 | 1980-11-18 | Schlumberger Technology Corporation | Apparatus and method for determining characteristics of subsurface formations |
| US4802361A (en) * | 1982-02-08 | 1989-02-07 | Texaco Inc. | Production stream analyzer |
| US4468611A (en) * | 1982-06-01 | 1984-08-28 | Tward 2001 Limited | Capacitive system for monitoring the dielectric properties of flowing fluid streams |
| FR2543687A1 (fr) * | 1983-03-31 | 1984-10-05 | Raffinage Cie Francaise | Procede et dispositif pour la determination, en continu, de la teneur en l'un de ses constituants, d'un melange eventuellement heterogene |
| JPH0232241A (ja) * | 1988-07-21 | 1990-02-02 | Calsonic Corp | 燃料センサ |
| GB8820687D0 (en) * | 1988-09-01 | 1988-10-05 | Chr Michelsen Inst | Three component ratio measuring instrument |
| JPH079076Y2 (ja) * | 1988-12-19 | 1995-03-06 | カルソニック株式会社 | 燃料センサ |
| US5033293A (en) * | 1990-03-09 | 1991-07-23 | Calsonic Corporation | Alcohol concentration detecting device |
| US5157337A (en) * | 1990-10-03 | 1992-10-20 | The United States Of America As Represented By The Secretary Of The Navy | Dielectric constant measurement probe assembly and apparatus and method |
| US5453693A (en) * | 1993-10-01 | 1995-09-26 | Halliburton Company | Logging system for measuring dielectric properties of fluids in a cased well using multiple mini-wave guides |
| US5642098A (en) * | 1996-04-18 | 1997-06-24 | Oems Corporation | Capacitive oil water emulsion sensor system |
| US5824889A (en) * | 1997-03-06 | 1998-10-20 | Kavlico Corporation | Capacitive oil deterioration and contamination sensor |
| US5929754A (en) * | 1997-12-03 | 1999-07-27 | Kavlico Corporation | High-sensitivity capacitive oil deterioration and level sensor |
| US6014894A (en) * | 1998-05-12 | 2000-01-18 | Herron; Bobby Joe | Motor sensor system |
| US6456096B1 (en) | 2000-05-08 | 2002-09-24 | Ut-Battelle, Llc | Monolithically compatible impedance measurement |
| US6933733B2 (en) * | 2003-03-14 | 2005-08-23 | Steris Inc. | Method and apparatus for measuring the concentration of hydrogen peroxide in a fluid |
| US6844742B2 (en) * | 2003-03-14 | 2005-01-18 | Steris Inc. | Method and apparatus for measuring chemical concentration in a fluid |
| US6930493B2 (en) * | 2003-03-14 | 2005-08-16 | Steris Inc. | Method and apparatus for monitoring detergent concentration in a decontamination process |
| US6946852B2 (en) * | 2003-03-14 | 2005-09-20 | Steris Inc. | Method and apparatus for measuring concentration of a chemical component in a gas mixture |
| US6897661B2 (en) * | 2003-03-14 | 2005-05-24 | Steris Inc. | Method and apparatus for detection of contaminants in a fluid |
| US6992494B2 (en) * | 2003-03-14 | 2006-01-31 | Steris Inc. | Method and apparatus for monitoring the purity and/or quality of steam |
| US6927582B2 (en) * | 2003-03-14 | 2005-08-09 | Steris Inc. | Method and apparatus for monitoring the state of a chemical solution for decontamination of chemical and biological warfare agents |
| US6960921B2 (en) * | 2003-03-14 | 2005-11-01 | Steris Inc. | Method and apparatus for real time monitoring of metallic cation concentrations in a solution |
| US6917885B2 (en) * | 2003-06-06 | 2005-07-12 | Steris Inc. | Method and apparatus for formulating and controlling chemical concentration in a gas mixture |
| US6909972B2 (en) * | 2003-06-06 | 2005-06-21 | Steris Inc. | Method and apparatus for formulating and controlling chemical concentrations in a solution |
| US7541002B2 (en) * | 2004-05-12 | 2009-06-02 | Steris Corporation | Apparatus for determining the efficiency of a vaporizer in a decontamination system |
| US20050276721A1 (en) * | 2004-05-25 | 2005-12-15 | Steris Inc. | Method and apparatus for controlling the concentration of a sterilant chemical in a fluid |
| AU2004321733B2 (en) * | 2004-06-18 | 2008-02-14 | American Sterilizer Company | Method and apparatus for monitoring the purity and/or quality of stem |
| US7431886B2 (en) * | 2004-09-24 | 2008-10-07 | Steris Corporation | Method of monitoring operational status of sensing devices for determining the concentration of chemical components in a fluid |
| NO323451B1 (no) * | 2005-08-11 | 2007-05-14 | Multi Phase Meters As | Fremgangsmåte og apparat for å bestemme konduktivitet og volumtraksjon av vann i en flerkomponentblanding |
| US9536122B2 (en) | 2014-11-04 | 2017-01-03 | General Electric Company | Disposable multivariable sensing devices having radio frequency based sensors |
| US9589686B2 (en) | 2006-11-16 | 2017-03-07 | General Electric Company | Apparatus for detecting contaminants in a liquid and a system for use thereof |
| US10914698B2 (en) | 2006-11-16 | 2021-02-09 | General Electric Company | Sensing method and system |
| US9658178B2 (en) | 2012-09-28 | 2017-05-23 | General Electric Company | Sensor systems for measuring an interface level in a multi-phase fluid composition |
| US9538657B2 (en) | 2012-06-29 | 2017-01-03 | General Electric Company | Resonant sensor and an associated sensing method |
| US10589134B2 (en) * | 2008-01-30 | 2020-03-17 | Kimberly-Clark Worldwide, Inc. | Hand health and hygiene system for hand health and infection control |
| US7775092B2 (en) * | 2008-02-07 | 2010-08-17 | Ssi Technologies, Inc. | Fuel delivery system and method |
| US11234905B2 (en) * | 2008-07-11 | 2022-02-01 | Kimberly-Clark Worldwide, Inc. | Formulations having improved compatibility with nonwoven substrates |
| US9949906B2 (en) * | 2008-07-11 | 2018-04-24 | Kimberly-Clark Worldwide, Inc. | Substrates having formulations with improved transferability |
| US8542023B2 (en) | 2010-11-09 | 2013-09-24 | General Electric Company | Highly selective chemical and biological sensors |
| AU2013305814B2 (en) | 2012-08-22 | 2017-04-13 | Ge Global Sourcing Llc | Wireless system and method for measuring an operative condition of a machine |
| US10598650B2 (en) | 2012-08-22 | 2020-03-24 | General Electric Company | System and method for measuring an operative condition of a machine |
| US9360361B2 (en) * | 2012-09-27 | 2016-06-07 | Magnetrol International, Inc. | System and method for emulsion measurement and profiling |
| US10684268B2 (en) | 2012-09-28 | 2020-06-16 | Bl Technologies, Inc. | Sensor systems for measuring an interface level in a multi-phase fluid composition |
| CN105158578A (zh) * | 2015-08-25 | 2015-12-16 | 北京工业大学 | 一种基于电桥法测量生物体介电常数装置 |
| US10498446B2 (en) | 2017-04-20 | 2019-12-03 | Harris Corporation | Electronic system including waveguide with passive optical elements and related methods |
| US10859486B2 (en) | 2017-05-26 | 2020-12-08 | General Electric Co. | Systems and method for down-hole phase monitoring |
| US11016075B2 (en) * | 2017-07-20 | 2021-05-25 | Saudi Arabian Oil Company | Methods and systems for characterization of geochemical properties of hydrocarbons using microwaves |
| US11385217B2 (en) * | 2020-07-29 | 2022-07-12 | Saudi Arabian Oil Company | Online measurement of dispersed oil phase in produced water |
| US11548784B1 (en) | 2021-10-26 | 2023-01-10 | Saudi Arabian Oil Company | Treating sulfur dioxide containing stream by acid aqueous absorption |
| US12116326B2 (en) | 2021-11-22 | 2024-10-15 | Saudi Arabian Oil Company | Conversion of hydrogen sulfide and carbon dioxide into hydrocarbons using non-thermal plasma and a catalyst |
| US11926799B2 (en) | 2021-12-14 | 2024-03-12 | Saudi Arabian Oil Company | 2-iso-alkyl-2-(4-hydroxyphenyl)propane derivatives used as emulsion breakers for crude oil |
| US12179129B2 (en) | 2021-12-14 | 2024-12-31 | Saudi Arabian Oil Company | Synergetic solvent for crude oil emulsion breakers |
| US12152487B2 (en) | 2022-06-09 | 2024-11-26 | Halliburton Energy Services, Inc. | Fluid identification outside of wellbore tubing |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2654067A (en) * | 1950-10-18 | 1953-09-29 | Standard Oil Dev Co | Cut point determination in pipe-line batching |
| US3523245A (en) * | 1968-04-04 | 1970-08-04 | Halliburton Co | Fluid monitoring capacitance probe having the electric circuitry mounted within the probe |
| US3515988A (en) * | 1968-09-12 | 1970-06-02 | Great Canadian Oil Sands | Stream analyzer for oil-in-water emulsions with compensation for temperature changes and for water conductivity changes |
-
1970
- 1970-06-26 US US50022A patent/US3675121A/en not_active Expired - Lifetime
-
1971
- 1971-01-12 CA CA102558A patent/CA921118A/en not_active Expired
- 1971-03-03 JP JP1072771A patent/JPS471248A/ja active Pending
- 1971-04-21 GB GB1060671*[A patent/GB1331327A/en not_active Expired
- 1971-04-28 DE DE19712120744 patent/DE2120744A1/de not_active Ceased
- 1971-06-18 FR FR7122370A patent/FR2096502B1/fr not_active Expired
-
1972
- 1972-07-03 US US00268286A patent/US3778706A/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0080632A1 (en) * | 1981-11-17 | 1983-06-08 | Nissan Motor Co., Ltd. | Oil deterioration detector |
| US4646070A (en) * | 1981-11-17 | 1987-02-24 | Nissan Motor Company, Limited | Oil deterioration detector method and apparatus |
| DE3438932A1 (de) * | 1984-10-24 | 1986-04-24 | Schaller-Automation Industrielle Automationstechnik KG, 6653 Blieskastel | Betriebsmess-verfahren und -geraet zur bestimmung der qualitaet von fluessigen brennstoffen und oelen |
| DE8707954U1 (de) * | 1987-06-04 | 1988-10-06 | Kohler, Hans-Michael, 8022 Zürich | Kapazitiver Messwertaufnehmer |
| EP0294334A1 (de) * | 1987-06-04 | 1988-12-07 | Hans-Michael Kohler | Kapazitiver Messwertaufnehmer |
| WO1988009930A1 (fr) * | 1987-06-04 | 1988-12-15 | Kohler Hans Michael | Transducteur capacitif |
Also Published As
| Publication number | Publication date |
|---|---|
| CA921118A (en) | 1973-02-13 |
| GB1331327A (en) | 1973-09-26 |
| FR2096502A1 (enExample) | 1972-02-18 |
| US3778706A (en) | 1973-12-11 |
| US3675121A (en) | 1972-07-04 |
| JPS471248A (enExample) | 1972-01-21 |
| FR2096502B1 (enExample) | 1974-09-27 |
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