DE961176C - Elektrische Schaltungsanordnung mit fallender Strom-Spannungs-Kennlinie - Google Patents
Elektrische Schaltungsanordnung mit fallender Strom-Spannungs-KennlinieInfo
- Publication number
- DE961176C DE961176C DEI6988A DEI0006988A DE961176C DE 961176 C DE961176 C DE 961176C DE I6988 A DEI6988 A DE I6988A DE I0006988 A DEI0006988 A DE I0006988A DE 961176 C DE961176 C DE 961176C
- Authority
- DE
- Germany
- Prior art keywords
- semiconductor
- voltage
- voltage source
- current
- electrical circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000004065 semiconductor Substances 0.000 claims description 33
- 239000002800 charge carrier Substances 0.000 claims description 15
- 229910052732 germanium Inorganic materials 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 14
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 12
- 230000006798 recombination Effects 0.000 claims description 5
- 238000005215 recombination Methods 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 description 8
- 230000001788 irregular Effects 0.000 description 7
- 239000003574 free electron Substances 0.000 description 6
- 239000013078 crystal Substances 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 239000000969 carrier Substances 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000011109 contamination Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
- H03G11/02—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general by means of diodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B7/00—Generation of oscillations using active element having a negative resistance between two of its electrodes
- H03B7/02—Generation of oscillations using active element having a negative resistance between two of its electrodes with frequency-determining element comprising lumped inductance and capacitance
- H03B7/06—Generation of oscillations using active element having a negative resistance between two of its electrodes with frequency-determining element comprising lumped inductance and capacitance active element being semiconductor device
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B9/00—Generation of oscillations using transit-time effects
- H03B9/01—Generation of oscillations using transit-time effects using discharge tubes
- H03B9/02—Generation of oscillations using transit-time effects using discharge tubes using a retarding-field tube
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/04—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only
- H03F3/10—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only with diodes
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/313—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of semiconductor devices with two electrodes, one or two potential barriers, and exhibiting a negative resistance characteristic
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/45—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of non-linear magnetic or dielectric devices
- H03K3/47—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of non-linear magnetic or dielectric devices the devices being parametrons
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
- A61F13/537—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/539—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium characterised by the connection of the absorbent layers with each other or with the outer layers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
- A61F2013/53445—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad from several sheets
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
- A61F13/537—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
- A61F2013/53765—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterized by its geometry
- A61F2013/53782—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterized by its geometry with holes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/539—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium characterised by the connection of the absorbent layers with each other or with the outer layers
- A61F2013/5395—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium characterised by the connection of the absorbent layers with each other or with the outer layers with thermoplastic agent, i.e. softened by heat
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Ceramic Engineering (AREA)
- Computer Hardware Design (AREA)
- Nonlinear Science (AREA)
- Electromagnetism (AREA)
- Amplifiers (AREA)
- Rectifiers (AREA)
- Thyristors (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR961176X | 1952-03-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE961176C true DE961176C (de) | 1957-04-04 |
Family
ID=9496098
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEI7573A Pending DE1003266B (de) | 1952-03-10 | Verstaerker fuer elektrische Schwingungen | |
DEI6988A Expired DE961176C (de) | 1952-03-10 | 1953-03-08 | Elektrische Schaltungsanordnung mit fallender Strom-Spannungs-Kennlinie |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEI7573A Pending DE1003266B (de) | 1952-03-10 | Verstaerker fuer elektrische Schwingungen |
Country Status (6)
Families Citing this family (30)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3125685A (en) * | 1964-03-17 | Nonlinear sensing circuit | ||
US3124701A (en) * | 1964-03-10 | Richard l | ||
US2879409A (en) * | 1954-09-09 | 1959-03-24 | Arthur W Holt | Diode amplifier |
US3112453A (en) * | 1954-09-09 | 1963-11-26 | Arthur W Holt | Diode amplifier |
US3070779A (en) * | 1955-09-26 | 1962-12-25 | Ibm | Apparatus utilizing minority carrier storage for signal storage, pulse reshaping, logic gating, pulse amplifying and pulse delaying |
US2975377A (en) * | 1956-08-07 | 1961-03-14 | Ibm | Two-terminal semiconductor high frequency oscillator |
US2939965A (en) * | 1956-12-20 | 1960-06-07 | Abraham George | Electrical switching circuit |
US2941094A (en) * | 1956-12-20 | 1960-06-14 | Abraham George | Electrical amplifying circuit |
US2939966A (en) * | 1956-12-20 | 1960-06-07 | Abraham George | Electrical switching circuit |
US2909679A (en) * | 1957-02-04 | 1959-10-20 | Abraham George | Hall effect circuit employing a steady state of charge carriers |
DE1072757B (de) * | 1957-05-29 | 1960-01-07 | Hazeltine Corporation, Washington, D. C. (V. St. A.) | Schaltung zur Erzeugung einer steilen Stromänderting durch einen Flächentransistor |
US3040191A (en) * | 1958-06-10 | 1962-06-19 | Westinghouse Electric Corp | Switching systems |
US3030523A (en) * | 1958-07-24 | 1962-04-17 | Westinghouse Electric Corp | Condition responsive impedance switching arrangement utilizing hyperconductive diode |
US2946901A (en) * | 1958-09-22 | 1960-07-26 | Robert J Kyler | Switching circuit for differentiator |
NL110675C (US08088918-20120103-C00476.png) * | 1959-05-13 | |||
NL253490A (US08088918-20120103-C00476.png) * | 1959-07-07 | 1900-01-01 | ||
US3058009A (en) * | 1959-07-15 | 1962-10-09 | Shockley William | Trigger circuit switching from stable operation in the negative resistance region to unstable operation |
US3136975A (en) * | 1959-07-20 | 1964-06-09 | Shell Oil Co | Monitoring circuit for logging instruments |
US3096445A (en) * | 1959-11-13 | 1963-07-02 | Rca Corp | Square wave generator compristing negative resistance diode and mismatched delay line producing steep edge pulses |
US3175096A (en) * | 1959-12-02 | 1965-03-23 | Ibm | Tunnel diode controlled magnetic triggers |
US3092734A (en) * | 1959-12-18 | 1963-06-04 | Rca Corp | Amplitude limiter for a. c. signals using a tunnel diode |
US3176149A (en) * | 1960-03-24 | 1965-03-30 | Gen Electric | Solid state circuit interrupter |
US3185860A (en) * | 1960-04-20 | 1965-05-25 | Rca Corp | Bistable device |
US3087123A (en) * | 1960-04-21 | 1963-04-23 | Rca Corp | Negative resistance diode multivibrators |
US3143660A (en) * | 1960-08-29 | 1964-08-04 | Rca Corp | Stabilized negative resistance diode circuit |
US3153151A (en) * | 1960-11-23 | 1964-10-13 | Hughes Aircraft Co | Transistor circuits utilizing shunt-input tunnel diode to provide positive switchingand improve rise time |
GB944211A (US08088918-20120103-C00476.png) * | 1961-02-28 | |||
US3188490A (en) * | 1962-04-03 | 1965-06-08 | Hunt Electronics Company | Power control circuit utilizing a phase shift network for controlling the conduction time of thyratron type devices |
US3262029A (en) * | 1962-07-24 | 1966-07-19 | Hughes Aircraft Co | Low noise microwave diode |
US3333196A (en) * | 1965-06-28 | 1967-07-25 | Abraham George | Electrical switching means |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE487452C (de) * | 1928-09-14 | 1929-12-10 | Abraham Esau Dr | Verfahren zur Gleichrichtung hochfrequenter Stroeme |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2418516A (en) * | 1944-06-06 | 1947-04-08 | Selenium Corp | Amplifier |
NL147713B (nl) * | 1948-07-23 | Laing & Son Ltd John | Werkwijze voor het bereiden van een plastische mortel. | |
US2627575A (en) * | 1950-02-18 | 1953-02-03 | Bell Telephone Labor Inc | Semiconductor translating device |
US2666816A (en) * | 1950-10-20 | 1954-01-19 | Westinghouse Electric Corp | Semiconductor amplifier |
US2647995A (en) * | 1950-12-07 | 1953-08-04 | Ibm | Trigger circuit |
USRE24303E (en) * | 1951-07-02 | 1957-04-16 | Semi-conductor trigger circuit |
-
0
- NL NLAANVRAGE7411075,A patent/NL180489B/xx unknown
- BE BE518294D patent/BE518294A/xx unknown
- DE DEI7573A patent/DE1003266B/de active Pending
- NL NLAANVRAGE7605551,A patent/NL176650B/xx unknown
- NL NL94444D patent/NL94444C/xx active
- BE BE521979D patent/BE521979A/xx unknown
-
1952
- 1952-03-10 FR FR1057036D patent/FR1057036A/fr not_active Expired
- 1952-08-08 FR FR63195D patent/FR63195E/fr not_active Expired
-
1953
- 1953-03-06 GB GB6274/53A patent/GB724296A/en not_active Expired
- 1953-03-08 DE DEI6988A patent/DE961176C/de not_active Expired
- 1953-03-09 US US341290A patent/US2843765A/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE487452C (de) * | 1928-09-14 | 1929-12-10 | Abraham Esau Dr | Verfahren zur Gleichrichtung hochfrequenter Stroeme |
Also Published As
Publication number | Publication date |
---|---|
BE518294A (US08088918-20120103-C00476.png) | |
NL176650B (nl) | |
US2843765A (en) | 1958-07-15 |
NL94444C (US08088918-20120103-C00476.png) | |
GB724296A (en) | 1955-02-16 |
FR63195E (fr) | 1955-08-25 |
DE1003266B (de) | 1957-02-28 |
NL180489B (nl) | |
BE521979A (US08088918-20120103-C00476.png) | |
FR1057036A (fr) | 1954-03-04 |
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