GB776923A - Travelling wave electron discharge devices - Google Patents

Travelling wave electron discharge devices

Info

Publication number
GB776923A
GB776923A GB24540/53A GB2454053A GB776923A GB 776923 A GB776923 A GB 776923A GB 24540/53 A GB24540/53 A GB 24540/53A GB 2454053 A GB2454053 A GB 2454053A GB 776923 A GB776923 A GB 776923A
Authority
GB
United Kingdom
Prior art keywords
helix
line
conductor
plate
centre
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
Application number
GB24540/53A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB776923A publication Critical patent/GB776923A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/02—Electrodes; Magnetic control means; Screens
    • H01J23/08—Focusing arrangements, e.g. for concentrating stream of electrons, for preventing spreading of stream
    • H01J23/087—Magnetic focusing arrangements
    • H01J23/0876—Magnetic focusing arrangements with arrangements improving the linearity and homogeniety of the axial field, e.g. field straightener
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/14—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by electrical means
    • B05D3/141—Plasma treatment
    • B05D3/142—Pretreatment
    • B05D3/144—Pretreatment of polymeric substrates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G81/00—Macromolecular compounds obtained by interreacting polymers in the absence of monomers, e.g. block polymers
    • C08G81/02—Macromolecular compounds obtained by interreacting polymers in the absence of monomers, e.g. block polymers at least one of the polymers being obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C08G81/021—Block or graft polymers containing only sequences of polymers of C08C or C08F
    • C08G81/022—Block or graft polymers containing only sequences of polymers of C08C or C08F containing sequences of polymers of conjugated dienes and of polymers of alkenyl aromatic compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/0427—Coating with only one layer of a composition containing a polymer binder
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/02—Electrodes; Magnetic control means; Screens
    • H01J23/06—Electron or ion guns
    • H01J23/065—Electron or ion guns producing a solid cylindrical beam
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/02—Electrodes; Magnetic control means; Screens
    • H01J23/08—Focusing arrangements, e.g. for concentrating stream of electrons, for preventing spreading of stream
    • H01J23/083—Electrostatic focusing arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/02—Electrodes; Magnetic control means; Screens
    • H01J23/08—Focusing arrangements, e.g. for concentrating stream of electrons, for preventing spreading of stream
    • H01J23/087—Magnetic focusing arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
    • H01J23/24—Slow-wave structures, e.g. delay systems
    • H01J23/26—Helical slow-wave structures; Adjustment therefor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
    • H01J23/24—Slow-wave structures, e.g. delay systems
    • H01J23/30—Damping arrangements associated with slow-wave structures, e.g. for suppression of unwanted oscillations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/36—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy
    • H01J23/40—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy to or from the interaction circuit
    • H01J23/42—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy to or from the interaction circuit the interaction circuit being a helix or a helix-derived slow-wave structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/36—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy
    • H01J23/40—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy to or from the interaction circuit
    • H01J23/48—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy to or from the interaction circuit for linking interaction circuit with coaxial lines; Devices of the coupled helices type
    • H01J23/50—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy to or from the interaction circuit for linking interaction circuit with coaxial lines; Devices of the coupled helices type the interaction circuit being a helix or derived from a helix
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
    • H01J25/34—Travelling-wave tubes; Tubes in which a travelling wave is simulated at spaced gaps
    • H01J25/36—Tubes in which an electron stream interacts with a wave travelling along a delay line or equivalent sequence of impedance elements, and without magnet system producing an H-field crossing the E-field
    • H01J25/38—Tubes in which an electron stream interacts with a wave travelling along a delay line or equivalent sequence of impedance elements, and without magnet system producing an H-field crossing the E-field the forward travelling wave being utilised
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
    • H01J25/50—Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
    • H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
    • H01Q11/08—Helical antennas
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/30—Angle modulation by means of transit-time tube
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H2/00—Networks using elements or techniques not provided for in groups H03H3/00 - H03H21/00
    • H03H2/005—Coupling circuits between transmission lines or antennas and transmitters, receivers or amplifiers
    • H03H2/006—Transmitter or amplifier output circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M5/00—Manual exchanges
    • H04M5/04—Arrangements for indicating calls or supervising connections for calling or clearing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2327/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
    • C08J2327/06—Homopolymers or copolymers of vinyl chloride
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2429/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer

Abstract

776,923. Travelling-wave tubes. STANDARD TELEPHONES & CABLES, Ltd. Sept. 4, 1953 [Sept. 29, 1952], No. 24540/53. Class 39(1). [Also in Group XL(b)] In a travelling-wave tube, the helical line is coupled to a coaxial line of lower impedance by a transition section of the line-above-a plane type-whose length is adjusted to be resonant at the operating frequency, the section being disposed transversely of the axis of the helix with one end shorted, a high voltage point coupled to the helix, and the low impedance line coupled to the transition section at a point between the shorted end and the high voltage point to match the low impedance line. In one embodiment input and output transition sections 12, 13, Fig. 1, consist of line conductor 17 of length equal to one or more half wavelengths both ends of which are shorted to plane plate 4 thus establishing a voltage maximum at the centre of 17 to which the helix 9 is attached. The input terminal 10 is a 50- ohm co-axial line the outer conductor being connected to plate 4 whilst the inner conductor 25 is connected to 17 at 26, energy being propagated along 17 in the T.E.M. mode. Plate 4 carries the electron gun and is mounted within cylinder 5 whilst plate 7 is similarly mounted and carries an insulated electron collector 21. The 300-ohm helix is supported by dielectric rods 14, 15, 16, Fig. 2, which are supported at their ends in aperture 19 in the transition section. In another embodiment the strip 17 is replaced by a wire of similar length of round or other cross section and slightly offset from the centre so that the electron beam passes to one side of the wire. In another embodiment quarter-wavelength conductor 29, Fig 5, replaces conductor 17 and is connected to plate 4b at the upper end only, additional support being provided by quarter-wavelength arms 31 and 32 which are also connected to 4b at their ends ; the helix is connected at the centre and the co-axial line 10b positioned as before. Alternatively conductor 17 may be replaced by rigid strip 33, Fig. 8 (not shown) of length <#>/4 and supported at its outer end only, the helix being connected to its inner end. Specification 706,958 is referred to.
GB24540/53A 1952-04-08 1953-09-04 Travelling wave electron discharge devices Expired GB776923A (en)

Applications Claiming Priority (18)

Application Number Priority Date Filing Date Title
US776923XA 1952-04-08 1952-04-08
DE316934X 1952-04-08
DE734963X 1952-07-05
US778846XA 1952-08-19 1952-08-19
US740852XA 1952-08-19 1952-08-19
US773393XA 1952-08-21 1952-08-21
US773783XA 1952-08-23 1952-08-23
US777224XA 1952-09-29 1952-09-29
US777225XA 1952-10-11 1952-10-11
US773394XA 1952-10-31 1952-10-31
DE745099X 1952-11-07
US756370XA 1952-11-19 1952-11-19
US754861XA 1953-04-01 1953-04-01
DE780806X 1953-04-18
DE771189X 1953-11-27
DE767078X 1954-04-03
US861229XA 1956-10-26 1956-10-26
US886318XA 1957-05-03 1957-05-03

Publications (1)

Publication Number Publication Date
GB776923A true GB776923A (en) 1957-06-12

Family

ID=31982865

Family Applications (20)

Application Number Title Priority Date Filing Date
GB8525/53A Expired GB766790A (en) 1952-04-08 1953-03-27 Improvements in or relating to travelling wave apparatus
GB8526/53A Expired GB734963A (en) 1952-04-08 1953-03-27 Arrangement for magnetic concentration of an electron beam in a travelling wave tube
GB21854/53A Expired GB740852A (en) 1952-04-08 1953-08-07 Means and method of supporting helical conductors
GB22493/53A Expired GB778846A (en) 1952-04-08 1953-08-14 Travelling wave tubes
GB22494/53A Expired GB773783A (en) 1952-04-08 1953-08-14 Travelling wave electron discharge devices
GB22491/53A Expired GB773393A (en) 1952-04-08 1953-08-14 R-f coupling arrangements for travelling wave tubes
GB24540/53A Expired GB776923A (en) 1952-04-08 1953-09-04 Travelling wave electron discharge devices
GB25817/53A Expired GB777224A (en) 1952-04-08 1953-09-18 Travelling wave electron discharge devices
GB26447/53A Expired GB777225A (en) 1952-04-08 1953-09-25 Travelling wave electron discharge devices
GB26450/53A Expired GB745099A (en) 1952-04-08 1953-09-25 Arrangement for magnetic concentration of an electron beam in a travelling wave tube
GB27869/53A Expired GB756370A (en) 1952-04-08 1953-10-09 Travelling wave electron discharge devices
GB29510/53A Expired GB773394A (en) 1952-04-08 1953-10-26 Magnet arrangements for travelling wave tubes
GB8924/54A Expired GB754861A (en) 1952-04-08 1954-03-26 Arrangements for coupling a coaxial transmission line to a helix slow wave structure
GB10496/54A Expired GB754563A (en) 1952-04-08 1954-04-09 Arrangement for magnetic concentration of an electron beam in a travelling wave tube
GB10495/54A Expired GB780806A (en) 1952-04-08 1954-04-09 Improvements in or relating to the provision of localised attenuation in travelling wave tubes
GB33565/54A Expired GB771189A (en) 1952-04-08 1954-11-19 Travelling wave tube
GB8858/55A Expired GB767078A (en) 1952-04-08 1955-03-25 Travelling wave tube
GB5891/56A Expired GB810267A (en) 1952-04-08 1956-02-24 Focusing magnet for long electron beams
GB33384/57A Expired GB861229A (en) 1952-04-08 1957-10-25 Radio frequency impedance matching section
GB14052/58A Expired GB886318A (en) 1952-04-08 1958-05-02 Travelling wave electron discharge device

Family Applications Before (6)

Application Number Title Priority Date Filing Date
GB8525/53A Expired GB766790A (en) 1952-04-08 1953-03-27 Improvements in or relating to travelling wave apparatus
GB8526/53A Expired GB734963A (en) 1952-04-08 1953-03-27 Arrangement for magnetic concentration of an electron beam in a travelling wave tube
GB21854/53A Expired GB740852A (en) 1952-04-08 1953-08-07 Means and method of supporting helical conductors
GB22493/53A Expired GB778846A (en) 1952-04-08 1953-08-14 Travelling wave tubes
GB22494/53A Expired GB773783A (en) 1952-04-08 1953-08-14 Travelling wave electron discharge devices
GB22491/53A Expired GB773393A (en) 1952-04-08 1953-08-14 R-f coupling arrangements for travelling wave tubes

Family Applications After (13)

Application Number Title Priority Date Filing Date
GB25817/53A Expired GB777224A (en) 1952-04-08 1953-09-18 Travelling wave electron discharge devices
GB26447/53A Expired GB777225A (en) 1952-04-08 1953-09-25 Travelling wave electron discharge devices
GB26450/53A Expired GB745099A (en) 1952-04-08 1953-09-25 Arrangement for magnetic concentration of an electron beam in a travelling wave tube
GB27869/53A Expired GB756370A (en) 1952-04-08 1953-10-09 Travelling wave electron discharge devices
GB29510/53A Expired GB773394A (en) 1952-04-08 1953-10-26 Magnet arrangements for travelling wave tubes
GB8924/54A Expired GB754861A (en) 1952-04-08 1954-03-26 Arrangements for coupling a coaxial transmission line to a helix slow wave structure
GB10496/54A Expired GB754563A (en) 1952-04-08 1954-04-09 Arrangement for magnetic concentration of an electron beam in a travelling wave tube
GB10495/54A Expired GB780806A (en) 1952-04-08 1954-04-09 Improvements in or relating to the provision of localised attenuation in travelling wave tubes
GB33565/54A Expired GB771189A (en) 1952-04-08 1954-11-19 Travelling wave tube
GB8858/55A Expired GB767078A (en) 1952-04-08 1955-03-25 Travelling wave tube
GB5891/56A Expired GB810267A (en) 1952-04-08 1956-02-24 Focusing magnet for long electron beams
GB33384/57A Expired GB861229A (en) 1952-04-08 1957-10-25 Radio frequency impedance matching section
GB14052/58A Expired GB886318A (en) 1952-04-08 1958-05-02 Travelling wave electron discharge device

Country Status (7)

Country Link
US (4) US2843789A (en)
BE (15) BE524061A (en)
CH (8) CH316934A (en)
DE (2) DE963704C (en)
FR (18) FR65473E (en)
GB (20) GB766790A (en)
NL (3) NL98392C (en)

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FR2711277B1 (en) * 1993-10-14 1995-11-10 Alcatel Mobile Comm France Antenna of the type for portable radio device, method of manufacturing such an antenna and portable radio device comprising such an antenna.
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US5596797A (en) * 1995-04-03 1997-01-28 D & M Plastics Corporation Method and apparatus for making a molded cellular antenna coil
KR20190046029A (en) * 2017-10-25 2019-05-07 삼성전기주식회사 Antenna device and portable terminal including the same
CN112692542B (en) * 2020-12-31 2023-03-17 山东微波电真空技术有限公司 Automatic assembly equipment for spiral line, clamping rod and pipe shell

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Also Published As

Publication number Publication date
CH333699A (en) 1958-10-31
GB756370A (en) 1956-09-05
GB780806A (en) 1957-08-07
GB778846A (en) 1957-07-10
BE524061A (en) 1900-01-01
GB766790A (en) 1957-01-23
FR69068E (en) 1958-09-22
BE521167A (en) 1900-01-01
FR65591E (en) 1956-02-28
BE522186A (en) 1900-01-01
CH316934A (en) 1956-10-31
US2812469A (en) 1957-11-05
BE523897A (en) 1900-01-01
GB740852A (en) 1955-11-23
FR66228E (en) 1956-06-05
FR68807E (en) 1958-06-10
FR65616E (en) 1956-02-29
DE963704C (en) 1957-05-09
FR68404E (en) 1958-04-30
GB777225A (en) 1957-06-19
GB810267A (en) 1959-03-11
FR68407E (en) 1958-04-30
CH335353A (en) 1958-12-31
CH330643A (en) 1958-06-15
FR68804E (en) 1958-06-10
CH322499A (en) 1957-06-15
FR65473E (en) 1956-02-21
BE545710A (en) 1900-01-01
BE519037A (en) 1900-01-01
GB767078A (en) 1957-01-30
BE534531A (en) 1900-01-01
US2911599A (en) 1959-11-03
GB773394A (en) 1957-04-24
US2857547A (en) 1958-10-21
BE523116A (en) 1900-01-01
CH317676A (en) 1956-11-30
GB734963A (en) 1955-08-10
GB773393A (en) 1957-04-24
FR65607E (en) 1956-02-29
FR65589E (en) 1956-02-28
BE523425A (en) 1900-01-01
FR65608E (en) 1956-02-29
GB754563A (en) 1956-08-08
GB861229A (en) 1961-02-15
DE1080702B (en) 1960-04-28
BE522303A (en) 1900-01-01
BE528213A (en) 1900-01-01
GB745099A (en) 1956-02-22
GB777224A (en) 1957-06-19
BE523117A (en) 1900-01-01
GB771189A (en) 1957-03-27
NL196187A (en) 1900-01-01
GB886318A (en) 1962-01-03
CH329897A (en) 1958-05-15
FR65606E (en) 1956-02-29
GB754861A (en) 1956-08-15
CH334111A (en) 1958-11-15
FR68403E (en) 1958-04-30
BE527787A (en) 1900-01-01
NL98392C (en) 1900-01-01
GB773783A (en) 1957-05-01
FR66421E (en) 1957-02-27
BE524397A (en) 1900-01-01
US2843789A (en) 1958-07-15
NL95555C (en) 1900-01-01
FR66233E (en) 1956-06-05
FR66230E (en) 1956-06-05
BE523177A (en) 1900-01-01
FR69062E (en) 1958-09-22

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