US2879420A - Image orthicon target - Google Patents
Image orthicon target Download PDFInfo
- Publication number
- US2879420A US2879420A US680745A US68074557A US2879420A US 2879420 A US2879420 A US 2879420A US 680745 A US680745 A US 680745A US 68074557 A US68074557 A US 68074557A US 2879420 A US2879420 A US 2879420A
- Authority
- US
- United States
- Prior art keywords
- glass
- target
- image
- photo
- image orthicon
- 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 - Lifetime
Links
- 239000011521 glass Substances 0.000 claims description 32
- 229910001111 Fine metal Inorganic materials 0.000 claims description 3
- 239000000203 mixture Substances 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052681 coesite Inorganic materials 0.000 description 3
- 229910052906 cristobalite Inorganic materials 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 229910052682 stishovite Inorganic materials 0.000 description 3
- 229910052905 tridymite Inorganic materials 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000002574 poison Substances 0.000 description 2
- 231100000614 poison Toxicity 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- NDVLTYZPCACLMA-UHFFFAOYSA-N silver oxide Chemical compound [O-2].[Ag+].[Ag+] NDVLTYZPCACLMA-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052792 caesium Inorganic materials 0.000 description 1
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910001947 lithium oxide Inorganic materials 0.000 description 1
- 238000012737 microarray-based gene expression Methods 0.000 description 1
- 238000012243 multiplex automated genomic engineering Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000005368 silicate glass Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229910001923 silver oxide Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
- H01J29/36—Photoelectric screens; Charge-storage screens
- H01J29/39—Charge-storage screens
- H01J29/41—Charge-storage screens using secondary emission, e.g. for supericonoscope
- H01J29/413—Charge-storage screens using secondary emission, e.g. for supericonoscope for writing and reading of charge pattern on opposite sides of the target, e.g. for superorthicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
- B01D3/26—Fractionating columns in which vapour and liquid flow past each other, or in which the fluid is sprayed into the vapour, or in which a two-phase mixture is passed in one direction
- B01D3/28—Fractionating columns with surface contact and vertical guides, e.g. film action
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/08—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances quartz; glass; glass wool; slag wool; vitreous enamels
- H01B3/087—Chemical composition of glass
Definitions
- This invention relates to glass compositions and particularly to compositions of glasses suitable for the target in lan image orthicon tu-be of improved design.
- a glass tube or envelope generally designated has a plane front end or face plate 11 having on its inner surface a photo-cathode 12 (shown in exaggerated thickness) consisting of a thin, continuous, semitransparent layer usually comprising cesium, silver oxide and silver. Spaced from the photo-cathode is a glass target 13 (shown in exagerated thickness) and improved composition for which forms the subject of this invention.
- the target 13 is a circular membrane, which may be about 40 mm. in diameter and 3-5 microns thick, sealed to a supporting ring 14 of metal having a thermal expansion coefficient compatible with that of the glass.
- Such glass heretofore used for the target, was normally composed of a soda-limesilicate glass of the type used in making incandescent electric lamp bulbs, such as is described in Patent No. 1,369,988 and particularly in Example 4 of that patent.
- a very fine metal gauze 15 (shown in exaggerated thickness) having about meshes per mm. with about 50-65% open area.
- an electron gun 16 is provided with a grid 17 surrounding the aperture ot' the gun and a multi-stage electron multiplier 1S.
- an optical image formed by a lens system (not shown) arranged in front of the face plate 11 is projected on the front surface of the photo-cathode 12.
- Photo-electrons thereby emitted from the rear surface of the photo-cathode strike the front face of the target 13 and cause the emission therefrom of secondary electrons in larger number than the photo-electrons.
- the emitted secondary electrons which are carried off by the metal gauze 15 leave electron deficiencies or positive charges on the front face of the target. Since the photo-electrons were compelled to pass through the metal gauze 15 on their way to the target 13, a pattern of individual positive charges thus remains on the front face of the target and delineates the image thereon.
- Such charges are conducted perpendicularly but not laterally through the glass target to its rear face where they are neutralized by a scanning beam of low-velocity ielectrons provided by the electron gun 16.
- the electron beam thus modulated is reflected to the grid 17 causing; the emission of secondary electrons therefrom which are,
- the proper functioning of the glass target depends upon the rapid transfer of. the positive charges of the image perpendicularly through the thin glass membrane without substantial equalization or loss by transverse con- To prevent such transverse loss the glass the image by the scanning beam, a phenomenon known as sticking To facilitate the rapid removal ofthe image charge, the glass target is made as thin as possi! bie. Suitable targets have a volume resistivity equal to about 11.4 to 12.1 for log R at room temperature and a thickness of 3 to 5 microns.
- ri ⁇ he composition of glass suitable as a target is dependent upon its interaction with the photo-cathode during operation of the tube.
- the glass target must not contaminate the photo-cathode and thereby decrease its ability to emit photo-electrons.
- the glass must be of such a composition that reaction with the photocathode does not cause undesirable effects such as sticking of the image.
- targets composed of the above-mentioned soda-lime-silicate glass tend to stick severely when used with improved photocathodes desirably containing a plurality of alkali metals.
- lithia-containing glass targets are unsuitable because they poison the improved photo-cathode although they do not form sticking images.
- Such improved photo-cathodes have higher sensitivities than prior photo-cathodes but have not been successfully incorporated into an image orthicon tube because glass targets suitable therefor have heretofore been unavailable.
- lt is an object of the present invention to provide a glass composition suitable for a target in an image orthicon tube having a multi-alkali photo-cathode which will not form a sticking image nor poison the photo-cathode.
- such a glass consists essentially by weight of about 5%-65% SiO2, about 25% KZO, and about 10%-20% Tio-2.
- the proportions of SiO2 may vary from 55% to 65% and of TiOz from 10% to 20% without unfavorably affecting the thermal expansion coeiiicient and without unduly affecting the electrical resistivity and other physical properties.
- the glass consists essentially of about 60% SiOz, about 25% KZO and about 15% TiOz.
- the Sb203 functions only as a ning agent and has no substantial effect on the fundamental properties of the glass.
- the batches melt readily either in a closed pot'or in a tank, preferably under oxidizing conditions, at about 13001400 C.
- the glass should be stirred during melting and ning in order to minimize cord's.
- The' more important physical and electrical properties' ofthe above glasses are as follows:
- an image orthicon tube comprising a glass envelope containing in longitudinal arrangement a photocathode, a grid of fine metal gauze, a thin glass target and an electron gun, the improvement which comprises making said target of a glass consisting essentially by weight of %65% SiOz, about 25% KQO and 10%- 20% TOZ.
- an image orthicon tube comprising a glass envelope containing in longitudinal arrangement a photocathode, a grid of ne metal gauze, a thin glass target and an electron gun, the improvement which comprises making said target of a glass consisting essentially by weight of about SiO2, about 25% KZO and about 15% TiO2.
Description
March 24, 1959 G, B, `HARES 2,879,420
:MAGE oR'rr-IICON TARGET Filed Aug; `28. 1957 uan'nnunnau .4r/'offrir United States Patent IMAGE ORTHICON TARGET George B. Hares, Corning, N.Y., assignor'to Corning Glass Works, Corning, N.Y., a corporatlon of New York Application August 28, 1957, Serial No. 680,745
2 Claims. (Cl. 3134-68) This invention relates to glass compositions and particularly to compositions of glasses suitable for the target in lan image orthicon tu-be of improved design.
Such tubes are utilized in video cameras to convert an optical image into an electronic image for broadcasting purposes. Their general structure is well known to those skilled in the art pertaining to television and requires little amplication here. For a better understanding of the invention, however, reference is had to the accompanying drawing which is a schematic sectional view of an image orthicon tube showing its general structure.
In the drawing a glass tube or envelope generally designated has a plane front end or face plate 11 having on its inner surface a photo-cathode 12 (shown in exaggerated thickness) consisting of a thin, continuous, semitransparent layer usually comprising cesium, silver oxide and silver. Spaced from the photo-cathode is a glass target 13 (shown in exagerated thickness) and improved composition for which forms the subject of this invention.
In a typical image orthicon tube, the target 13 is a circular membrane, which may be about 40 mm. in diameter and 3-5 microns thick, sealed to a supporting ring 14 of metal having a thermal expansion coefficient compatible with that of the glass. Such glass, heretofore used for the target, was normally composed of a soda-limesilicate glass of the type used in making incandescent electric lamp bulbs, such as is described in Patent No. 1,369,988 and particularly in Example 4 of that patent.
In front of the target 13 and spaced about 50-100 microns therefrom is a very fine metal gauze 15 (shown in exaggerated thickness) having about meshes per mm. with about 50-65% open area. In the opposite end of the tube l0, an electron gun 16 is provided with a grid 17 surrounding the aperture ot' the gun and a multi-stage electron multiplier 1S.
In the operation of the image orthicon tube an optical image formed by a lens system (not shown) arranged in front of the face plate 11 is projected on the front surface of the photo-cathode 12. Photo-electrons thereby emitted from the rear surface of the photo-cathode strike the front face of the target 13 and cause the emission therefrom of secondary electrons in larger number than the photo-electrons. The emitted secondary electrons which are carried off by the metal gauze 15 leave electron deficiencies or positive charges on the front face of the target. Since the photo-electrons were compelled to pass through the metal gauze 15 on their way to the target 13, a pattern of individual positive charges thus remains on the front face of the target and delineates the image thereon.
Such charges are conducted perpendicularly but not laterally through the glass target to its rear face where they are neutralized by a scanning beam of low-velocity ielectrons provided by the electron gun 16. The electron beam thus modulated is reflected to the grid 17 causing; the emission of secondary electrons therefrom which are,
collected by the multiplier 18 and subsequently amplied for broadcasting.
Further details of the structure and operation of an image orthicon tube are described beginning at page of R.C.A. Review, volume lO (June 1949), in an article entitled Development and Performance of Television Camera Tubes, by Janes, Johnson and Moore.
The proper functioning of the glass target depends upon the rapid transfer of. the positive charges of the image perpendicularly through the thin glass membrane without substantial equalization or loss by transverse con- To prevent such transverse loss the glass the image by the scanning beam, a phenomenon known as sticking To facilitate the rapid removal ofthe image charge, the glass target is made as thin as possi! bie. Suitable targets have a volume resistivity equal to about 11.4 to 12.1 for log R at room temperature and a thickness of 3 to 5 microns.
ri`he composition of glass suitable as a target is dependent upon its interaction with the photo-cathode during operation of the tube. The glass target must not contaminate the photo-cathode and thereby decrease its ability to emit photo-electrons. Also the glass must be of such a composition that reaction with the photocathode does not cause undesirable effects such as sticking of the image. It has been found, that targets composed of the above-mentioned soda-lime-silicate glass tend to stick severely when used with improved photocathodes desirably containing a plurality of alkali metals. Likewise, it has been found that lithia-containing glass targets are unsuitable because they poison the improved photo-cathode although they do not form sticking images. Such improved photo-cathodes have higher sensitivities than prior photo-cathodes but have not been successfully incorporated into an image orthicon tube because glass targets suitable therefor have heretofore been unavailable.
lt is an object of the present invention to provide a glass composition suitable for a target in an image orthicon tube having a multi-alkali photo-cathode which will not form a sticking image nor poison the photo-cathode.
According to the invention such a glass consists essentially by weight of about 5%-65% SiO2, about 25% KZO, and about 10%-20% Tio-2.
While the stated proportion of KZO is critical within a fraction of a percent for maintaining the proper coefcient of thermal expansion, the proportions of SiO2 may vary from 55% to 65% and of TiOz from 10% to 20% without unfavorably affecting the thermal expansion coeiiicient and without unduly affecting the electrical resistivity and other physical properties.
Preferably, however, the glass consists essentially of about 60% SiOz, about 25% KZO and about 15% TiOz.
Examples of glass compositions which can be used for targets to obtain the ladvantages of this invention can be prepared by melting the following batches:
The glasses corresponding to the above batches, calcu- Patmehfed Man. .24, ,1.959.
lated in weight percent on the oxide basis, are as follows:
Sio 54. 7 59. 8 64. 7 X30 24. 9 24. 9 24. 9 T: 19. 9 14. 8 9. 9 Shao; 0. 0. 5 0. 5
The Sb203 functions only as a ning agent and has no substantial effect on the fundamental properties of the glass. The batches melt readily either in a closed pot'or in a tank, preferably under oxidizing conditions, at about 13001400 C. Preferably the glass should be stirred during melting and ning in order to minimize cord's. The' more important physical and electrical properties' ofthe above glasses are as follows:
What is claimed is:
1. In an image orthicon tube comprising a glass envelope containing in longitudinal arrangement a photocathode, a grid of fine metal gauze, a thin glass target and an electron gun, the improvement which comprises making said target of a glass consisting essentially by weight of %65% SiOz, about 25% KQO and 10%- 20% TOZ.
2. In an image orthicon tube comprising a glass envelope containing in longitudinal arrangement a photocathode, a grid of ne metal gauze, a thin glass target and an electron gun, the improvement which comprises making said target of a glass consisting essentially by weight of about SiO2, about 25% KZO and about 15% TiO2.
References Cited in the le of this patent UNITED STATES PATENTS 2,617,058 De Boer Nov. 4, 1952 2,617,954 Rose Nov. 11, 1952 2,676,109 Barnes Apr. 20, 1954 2,688,559 Armistead Sept. 7, 1954 UNITED STATES PATENT OFFICE CERTIFICATE OF lC0RRECTIO1\I Patent No. 2,879,420 March 24', 1959 George B Heres It is herebir certified that error appears in the-printed specification of the above 4numbered patent requiring correction and that the said Letters Patent should read as corrected below.
Column 2, line 4'?, for H5%=65%" read 55%-65% w; column 3, second table, first columr thereof, fourth line, after "Expansion coeff." for read X Signed and sealed this 9th day of' June 1959,.
litt) ROBERT C. WATSON Commissioner of Patents KARL H., MINE Attesting Oiicer
Claims (1)
1. IN AN IMAGE ORTHICON TUBE COMPRISING A GLASS ENVELOPE CONTAINING IN LONGITUDINAL ARRANGEMENT A PHOTOCATHODE, A GRID OF FINE METAL GAUZE, A THIN GLASS TARGET AND AN ELECTRON GUN, THE IMPROVEMENT WHICH COMPRISES MAKING SAID TARGET OF A GLASS CONSISTING ESSENTIALLY BY WEIGHT OF 55%-65% SIO2, ABOUT 25% K2O AND 10% 20% TIO2.
Priority Applications (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL230837D NL230837A (en) | 1957-08-28 | ||
| BE570696D BE570696A (en) | 1957-08-28 | ||
| IT595125D IT595125A (en) | 1957-08-28 | ||
| NL121047D NL121047C (en) | 1957-08-28 | ||
| US680745A US2879420A (en) | 1957-08-28 | 1957-08-28 | Image orthicon target |
| GB26802/58A GB836348A (en) | 1957-08-28 | 1958-08-20 | Glass composition |
| DEC17409A DE1113001B (en) | 1957-08-28 | 1958-08-27 | Glass for the storage disk of a Superorthikon television recording tube |
| FR1201858D FR1201858A (en) | 1957-08-28 | 1958-08-27 | Glass compositions |
| CH6338758A CH375495A (en) | 1957-08-28 | 1958-08-28 | Orthicon picture tube target glass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US680745A US2879420A (en) | 1957-08-28 | 1957-08-28 | Image orthicon target |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2879420A true US2879420A (en) | 1959-03-24 |
Family
ID=24732340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US680745A Expired - Lifetime US2879420A (en) | 1957-08-28 | 1957-08-28 | Image orthicon target |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US2879420A (en) |
| BE (1) | BE570696A (en) |
| CH (1) | CH375495A (en) |
| DE (1) | DE1113001B (en) |
| FR (1) | FR1201858A (en) |
| GB (1) | GB836348A (en) |
| IT (1) | IT595125A (en) |
| NL (2) | NL230837A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3069578A (en) * | 1960-03-31 | 1962-12-18 | Corning Glass Works | Image orthicon target |
| US4073989A (en) * | 1964-01-17 | 1978-02-14 | Horizons Incorporated | Continuous channel electron beam multiplier |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1048390A (en) * | 1963-12-13 | 1966-11-16 | English Electric Valve Co Ltd | Improvements in or relating to television camera cathode ray tubes |
| GB1079621A (en) * | 1964-01-02 | 1967-08-16 | Gen Electric | Image orthicon target |
| DE1271757B (en) * | 1966-12-06 | 1968-07-04 | Jenaer Glaswerk Schott & Gen | Storage electrode for Superorthikon picture tubes |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2617058A (en) * | 1949-03-05 | 1952-11-04 | Hartford Nat Bank & Trust Co | Television transmitting tube |
| US2617954A (en) * | 1950-12-27 | 1952-11-11 | Rca Corp | Pickup tube |
| US2676109A (en) * | 1950-12-22 | 1954-04-20 | American Optical Corp | Glass |
| US2688559A (en) * | 1953-04-27 | 1954-09-07 | Corning Glass Works | Eye-protective ophthalmic glass |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE868495C (en) * | 1951-07-06 | 1953-02-26 | Owens Corning Fiberglass Corp | Glass composition, preferably for the manufacture of glass fibers |
-
0
- BE BE570696D patent/BE570696A/xx unknown
- NL NL121047D patent/NL121047C/xx active
- IT IT595125D patent/IT595125A/it unknown
- NL NL230837D patent/NL230837A/xx unknown
-
1957
- 1957-08-28 US US680745A patent/US2879420A/en not_active Expired - Lifetime
-
1958
- 1958-08-20 GB GB26802/58A patent/GB836348A/en not_active Expired
- 1958-08-27 FR FR1201858D patent/FR1201858A/en not_active Expired
- 1958-08-27 DE DEC17409A patent/DE1113001B/en active Pending
- 1958-08-28 CH CH6338758A patent/CH375495A/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2617058A (en) * | 1949-03-05 | 1952-11-04 | Hartford Nat Bank & Trust Co | Television transmitting tube |
| US2676109A (en) * | 1950-12-22 | 1954-04-20 | American Optical Corp | Glass |
| US2617954A (en) * | 1950-12-27 | 1952-11-11 | Rca Corp | Pickup tube |
| US2688559A (en) * | 1953-04-27 | 1954-09-07 | Corning Glass Works | Eye-protective ophthalmic glass |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3069578A (en) * | 1960-03-31 | 1962-12-18 | Corning Glass Works | Image orthicon target |
| DE1180775B (en) * | 1960-03-31 | 1964-11-05 | Corning Glass Works | Storage plate for Superorthikon picture tubes |
| US4073989A (en) * | 1964-01-17 | 1978-02-14 | Horizons Incorporated | Continuous channel electron beam multiplier |
Also Published As
| Publication number | Publication date |
|---|---|
| BE570696A (en) | |
| IT595125A (en) | |
| DE1113001B (en) | 1961-08-24 |
| FR1201858A (en) | 1960-01-06 |
| GB836348A (en) | 1960-06-01 |
| NL230837A (en) | |
| CH375495A (en) | 1964-02-29 |
| NL121047C (en) |
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