US3829730A - Getter assembly - Google Patents

Getter assembly Download PDF

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Publication number
US3829730A
US3829730A US00369241A US36924173A US3829730A US 3829730 A US3829730 A US 3829730A US 00369241 A US00369241 A US 00369241A US 36924173 A US36924173 A US 36924173A US 3829730 A US3829730 A US 3829730A
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US
United States
Prior art keywords
getter
tube
container
assembly
wall
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
Application number
US00369241A
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English (en)
Inventor
C Reash
V Pietrasz
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.)
SAES Getters SpA
Original Assignee
Union Carbide Corp
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 Union Carbide Corp filed Critical Union Carbide Corp
Priority to US00369241A priority Critical patent/US3829730A/en
Priority to DE19742427342 priority patent/DE2427342A1/de
Priority to CA201,813A priority patent/CA1002104A/en
Priority to IT51493/74A priority patent/IT1013445B/it
Priority to GB2576174A priority patent/GB1476339A/en
Priority to JP6564674A priority patent/JPS5034160A/ja
Priority to NL7407789A priority patent/NL7407789A/xx
Application granted granted Critical
Publication of US3829730A publication Critical patent/US3829730A/en
Assigned to MORGAN GUARANTY TRUST COMPANY OF NEW YORK, AND MORGAN BANK ( DELAWARE ) AS COLLATERAL ( AGENTS ) SEE RECORD FOR THE REMAINING ASSIGNEES. reassignment MORGAN GUARANTY TRUST COMPANY OF NEW YORK, AND MORGAN BANK ( DELAWARE ) AS COLLATERAL ( AGENTS ) SEE RECORD FOR THE REMAINING ASSIGNEES. MORTGAGE (SEE DOCUMENT FOR DETAILS). Assignors: STP CORPORATION, A CORP. OF DE.,, UNION CARBIDE AGRICULTURAL PRODUCTS CO., INC., A CORP. OF PA.,, UNION CARBIDE CORPORATION, A CORP.,, UNION CARBIDE EUROPE S.A., A SWISS CORP.
Assigned to UNION CARBIDE CORPORATION, reassignment UNION CARBIDE CORPORATION, RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: MORGAN BANK (DELAWARE) AS COLLATERAL AGENT
Assigned to GETTERS CORPORATION OF AMERICA, A CORP. OF DE. reassignment GETTERS CORPORATION OF AMERICA, A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: UNION CARBIDE CORPORATION
Assigned to SAES GETTERS SPA reassignment SAES GETTERS SPA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: GETTERS CORPORATION OF AMERICA
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01J29/94—Selection of substances for gas fillings; Means for obtaining or maintaining the desired pressure within the tube, e.g. by gettering

Definitions

  • An improved getter assembly for slideable insertion into a TV picture tube comprising a getter container, supported by an extended flexible springlike support arm adapted to urge the getter assembly against the wall of the picture tube, the getter container having at least one side wall and a connecting floor member and a small cross section wire member depending downwardly from the floor member and having as a part thereof at least two laterally spaced apart curved base portions extending into said picture tube substantially parallel to the spring-like support member and for contacting the inner walls of the tube and supporting the getter container off the wall of the tube.
  • This invention relates to an improved getter assembly and more particularly to an improved channel ring getter assembly adapted for mounting in a television picture tube against a wall thereof without danger of damaging said wall during insertion of the device intothe tube or during flashing of the getter material and without danger of entanglement with other adjacent getter assemblies.
  • getter materials in the manufacture of electronic tubes are well known.
  • a commonly used getter construction consists of a container, such as an annular U-shaped receptacle, with the getter material pressed into the container. This assembly is mounted in an electron tube, for example, a television picture tube. After the tube is evacuated, the residual gases left in the tube are removed by heating the getter container and material therein to a high temperature, suitably by induction heating, whereupon the getter material is flashed or vaporized. The vaporized getter material adsorbs or reacts with the residual gases and removes them as low vapor pressure solid condensates and continues to adsorb any further liberated gases throughout the life of the tube.
  • the getter material principally comprises: a
  • An exothermic gettering powder can comprise: a barium-aluminum alloy or mixture plus about an equal weight of powdered nickel. The nickel reacts exothermically with the aluminum upon heating to supply additional heat for evaporating the barium.
  • a typical channel ring exothermic getter used in color television picture tubes thus may contain, for example, 1,000 mg. of a 25 per cent barium 25 per cent aluminum 50 per cent nickel exothermicalloy yielding about 200 to 250 mg. of barium on heating.
  • the getter container itself may comprise a U shaped channel formed into a ring of, for example, about 1 inch outside diameter and having a channel width of, say, 0. 150 inch to 0.220.
  • the getter powder is pressed into the channel width of, say, 0.150 to 0.220 inch.
  • the getter powder is pressed into the channel.
  • the flashing of the getter requires heating to a high temperature, about l,300 C., to vaporize the barium, or whatever getter material is utilized.
  • the residue and the channel ring container are themselves heated to a high temperature.
  • This heating results in the melting or sintering of the residue barium-nickelaluminum powder, or whatever unflashed material is present.
  • the container itself generally stainless steel, is itself heated to a temperature often near its melting point; and in the case of improperly formed or positioned getter assemblies, the stainless steel ring may melt.
  • an electron tube particularly a television picture tube generally comprises a neck portion in which are located the electron gun or guns and auxiliary equipment; an enlarged bulb portion which tenninates in a generally flat viewing screen; and a funnel-shaped portion joining the neck and bulb portions.
  • the ringshaped getter container was usually mounted in the neck portion of the tube positioned on the electron gun, it is now a desired practice to mount the getter container in or near the funnel portion of the tube.
  • the getter container Since the getter container must be outside the path of the stream of electrons directed from the electron gun toward the screen, and since the diameter of the funnel cross section at the selected site maybe only slightly larger than that of the neck portion, it is necessary to have the getter container actually abutting against the wall of the tube. This is accomplished by mounting the getter container at the end of a spring-like metallic strip support or antenna, the other end of which is fixed to a wall of the electron gun in theneck portion of the tube. The spring is biased to force the getter container against the wall of the tube in the funnel portion and thus keep clear the path for the electron beam and to hold the getter on the funnel wall to promote good coupling with the R-F induction heating coil.
  • This positioning of the getter container in direct contact with the glass walls of the tube can and often does cause cracking of the glass when the getter container is heated inductively to high temperatures during flashing. Since the television tube is for the most part completely fabricated just prior to gettering, the cracking of the tube at this time is a substantial loss. In addition, it is important that the getter container be properly aligned inside the tube so that it is properly heated by the coil and so that the gettering flash is properly directed. Such alignment is difficult to achieve using normal production line techniques. In an attempt to over-- come the problem of the tube cracking due to localized heating from contact with the extremely hot base of the getter container, a ceramic member or other insulating member was positioned between the getter container and the tube wall.
  • the ceramic heat shield is held to the underside of the getter container by one or more metallic wires, tabs or bars. It has been found, however, that the ceramic member is subject to physical abuse during shipment and installation of the getter in the tube (or during removal of the TV gun from a tube which must be reworked) and may crack or chip loosening the ceramic member in its support. The presence of an unsecured member such as this is undesirable because the resulting rattle can be confused by tube assemblers as being an indication of the breakage of a major electronic component of the tube and result in the need to reopen the tube for inspection. Additionally, the presence of any loose foreign bodies, such as the chips from a ceramic member, is highly undesirable in a TV tube because of possible interference with the delicate elec tronic components therein.
  • an improved getter assembly for mounting in an electron tube in an abutting relationship to a wall of the tube, said assembly comprising a getter container having at least one continuous side wall and a floor member connecting said side wall and having getter material pressed into the space formed by said side wall and the floor member, and a small cross section wire support member depending downwardly from the floor member and having as a part thereof at least two laterally spaced apart base portions for contacting the walls of a tube and supporting the getter container off the tube wall in a non-heat damaging relationship therewith, said base portions being curved inwardly into the pciture tube to provide minimal area of contact with the tube wall, ease of slideable movement along the tube walls during insertion into or removal of the getter assembly from the tube, and to avoid entanglement with adjacent getter assemblies.
  • the curved base portions act as skids having low frictional resistance with the tube walls whereby the getter container can be easily inserted into the tube or removed therefrom.
  • the getter container can be an annular channel ring getter container having opposing inner and outer circular side walls and an annular floor member connecting said side walls to form an annular space into which the getter material is pressed.
  • the channelcontainer could also be formed in other than circular configurations, e.g., in an oval shape.
  • the getter container could also be a dish-shaped container having, e.g., a circular floor member with an upstanding continuous side wall encircling the floor member.
  • the small cross section wire support member is connected near its mid portion to the underside of the getter container and the end portions of the wire support members are each bent in a plane perpendicular to the mid section of the wire support member, first downwardly and then up wardly to form curved base portion for abutting against the. walls of the tube.
  • the curved base portions should each lie in planes which are parallel to the direction of insertion into the tube so as to allow for minimal contact with the walls of the tube during insertion and the ends of the curved portions should extend in the direction of insertion.
  • a channel ring container has a mounting bar extending across a diameter thereof and fastened at opposite sides of the container floor member.
  • the mounting bar extends in the same direction as the device is inserted into the tube.
  • the small cross section wire support member has a central portion arranged generally perpendicular to the mounting bar and is connected at its mid point to the mounting bar, with the opposite end portions of the wire support member each bent in a direction perpendicular to the central portion of the wire support member, parallel to the mounting bar, first downwardly and then upwardly in the direction of insertion into the picture tube to form curved base portions for abutting against the walls of the tube.
  • FIG. 1 is a partial schematic view of the neck and funnel portions of a television picture tube, in cross section, including a getter assembly of the present invention, mounted in an antenna position;
  • FIG. 2 is a partial view of the arrangement of FIG. 1 looking from the neck into the funnel of the tube;
  • FIG. 3 is a plan view of the portion of a picture tube and getter assembly of FIG. 1;
  • FIG. 4- is a perspective view of the wire member which is mounted under the getter container for supporting the getter container off the walls of the tube;
  • FIG. 5 is a side view of the getter assembly
  • FIG. 6 is an end view of the getter assembly
  • FIG. 7 is a plan view of another embodiment of the getter assembly of this invention.
  • FIG. 8 is a side view of the embodiment shown in FIG. 7.
  • FIG. 1 a portion 10 of a typical glass television tube is shown.
  • a typical glass television tube may be viewed as having three main parts, a neck portion 11, a funnel portion 12, and the bulb or main portion, only a part 13 of which is shown.
  • An electron gun 14 is shown positioned in-the neck of the tube.
  • a flat antenna spring or support arm 15 is shown fixed at one end 15a to the side wall of the gun and having mounted on its opposite end 15b the getter assembly 16 of this invention.
  • the support arm 15 is a piece of flat thin, flexible generally non-magnetic, metal strip biased to urge the getter assembly 16 against the wall 17 of the tube, in the case shown, in the funnel portion 12 of the tube. It is to be understood that the getter assembly of this invention could be used in other portions of the tube, if desired, with other arrangements for biasing it against a wall of the tube.
  • the getter assembly 16 comprises a getter container 18 and underlying wire support member 19. As seen in FIGS. 1 and 2, the curved end portions 20 and 21 of the wire support member 19 are the only parts of the getter assembly 16 which actually contact the glass wall 17 of the tube and these parts extend parallel to support arm 15 on the direction of insertion into the picture tube.
  • FIG. 2 which is a view in a direction parallel to the axis of the electron gun, the wire member support is seen to touch the tube wall at its two outer extremities 20 and 21, which are widely spaced apart and result in a stable positioning of the getter assembly and assuring proper orientation of the getter container in the tube, and assuring a properly directed flashing of the vaporized getter material into the tube interior as shown by the arrows.
  • a particular advantage of the getter assembly of the present invention derives from the arrangement of the portions indicated at 20 and 21 in the drawing whereby these portions extend parallel to support arm 15 and in the direction of insertion of the getter assembly.
  • getters are stocked together and, with skids in the form bly, as hereinafter set forth.
  • I t shown in the dotted lines often became entangledQ
  • the antenna supports 15 of one getter assembly often became entangled with the skids of I another getter assembly. Assembly personnel, in attempting to free the getter assemblies would often permanently deform the entangled antenna member, effectively resulting in their destruction; At other times, the deformed assemblies would be inserted in picture tubes and result in poor flashing, i.e., deficient gettering, due to misalignment of the getter assemblies, re-
  • FIG. 3 shows a plan view of a particular embodiment of the invention, a channel ring type getter container 22.
  • the wire support member 19 is visible in the open center of the ring container.
  • the end 23 of the antenna support arm 15 is shown fixed to a mounting bar 24 which is a part of this embodiment of the getterassem-
  • FIG. 4 shows a perspective view of the wire support member and
  • FIGS. 5 and 6 show a side view and anend view of the getter assembly.
  • thewire support member 19 is made from a section of wire 25 having a small diameter and resulting small cross section and low mass.
  • the small diameter wire support member l9q will not be heated to a hightemperaturebecause of its low mass. Additionally, since the curved end'portions 20 and 21 are the only portions'of the getter assembly which contact the glass walls of the tube and since the 'area of contact is minimal because of the curve of these portions, the glass wall is not subjected to the hightemperatures which may exist during flashing in-the getter container 18. v
  • the wire support member 19 is arranged perpendicularly to the mounting bar 24 and fastened at its mid-point 36, which can be flattened, to about the mid-point of the mounting bar 24, as by a spot weld. At times it may be of advantage to fasten the wire support member 19 away from the center of the mounting bar 24.
  • the wire support member will thus depend downwardly from the getter container with the curved bases 34and 35 situated under opposite edges of thering container;
  • the bases 34 and 35 are the only portions of the getter assembly which come in contact with the walls of the tube. Since there: is no direct contact between these bases 34 and 35 and the getter container,
  • the wire support member is formed from a small diameter wire and has a low mass
  • this member will not itself be highly heatedby the R-F .of the mounting bar 24.
  • the ends 37 and ,38 of the wire supportmember may be joined to opposite points of the underside of the channel ring floor member 29, as by spot welding.
  • the wire support member could also be joined to the'underside of a solid center, getter container of the type shown in FIG. 7 which has a solid center piece- 39 of the periphery of which More specifically, in the embodiment shown in FIG.
  • the getter container 18 is seen to be composed of a channel member havingopposing side walls 27 and 28 and annular bottom wall 29 connecting, the side walls.
  • the getter material 30 may be pressed into thespace formed by the side walls and the bottom wall.
  • channel member has its ends joined to form a convenv tional ring shape, although it is to be understood that getter containers of other than ring shape may be. employed, e.g., oval shapes.
  • the channel ring getter container has a mounting bar 24 extending across a diameter of the ring and secured at the underside of the floor member 29 at-points on serted into the tube with the mounting bar and antenn arm parallel to the central axis of the tube.
  • the wire support member 19 consists of a length of Y and support arm are coaxial.
  • the getter assembly is in- I small diameter wire having a middle portion 25 prefer- I ably about equal to or less than the length of a diameter also forms the inner wall 40 of the channel ring.
  • the outer .wall 41 forms with this inner wall 40 the annular space into which the getter material is pressed.
  • a mounting bar In the embodiment shown in FIGS. 7 and 8, a mounting bar.
  • FIGS. 7 and 8 An advantage of a solid center getter containeras shown in FIGS. 7 and 8 is that the solid center piece 39 is heated during flashing of the getter container. Any getter material which is deposited on this hot center piece during flashing is immediately revaporized and directed into the bulb of the tube.
  • the space 50between the getter container 18 and base members 34 and 35 are arranged to be less than the thickness of the base members so that entanglement of the base members of adjacent getter assemblies is avoided.
  • getter containers having solid centers e.g., a dish-shaped getter container having a substantially flat circular bottom member may have the wire support member of this invention attached to the bottom thereof either directly or by means, of a mounting bar.
  • the wire support member of this invention having curved inwardly, end portions allows for the accurate positioning of the getter container in the tube relative to the positioning of the heating coil and eliminates the problem of entanglement as above mentioned.
  • the wire support member ensures proper positioning of the getter container so that identical flashing conditions are obtained from tube to tube. While the wire support member is shown with two spaced apart end portions 34 and 35, it can also be furnished with additional curved end portions to achieve, e. g., a threepoint support of the container off the wall of the tube, so as to orient the getter container at a specific angle in the tube to cause flashing of barium in a specified direction. The.
  • each curved portion be bent in the direction in which the getter container is to be inserted into the tube, so that the getter container could be slid into the tube using the curved end portions as runners having slight frictional resistance on the walls of the tube.
  • getter containers having'the wire support members of this invention do not cause excessive heating of the tube wall during flashing. Because of the low mass of the support member, it is not heated to a high temperature and because of the small area of contact between the curved end portions and the tube wall, there is little transfer of heat from the support member to the tube wall. As a result the problem of glass cracking is substantially eliminated. Additionally, because the inwardly extending curved end portions of the wire support member act as skids of low frictional resistance, the getter container can be easily inserted without danger'of entanglement into its proper position in the tube without excessive scraping of the aquadag coating normally present on the walls of such tubes. The getter container can just as easily be removed from the tube should the need arise.
  • An improved getter assembly adapted for insertion in an electron picture tube in an abutting relationship to a wall of the picture tube, said assembly comprising a getter container having at least one side wall and a floor 'member connected to said side wall and having getter material pressed into the space formed by said side wall and floor member, an extended springlike support arm attached to the getter container adapted to urge the getter container toward the wall of the picture tube upon insertion of the getter container therein and a small circular cross section wire support member depending downwardly from the floor member of said getter container having as a part thereof at least two laterallyspaced apart and substantially'base portions parallel for contacting the walls of the picture tube and supporting the getter container in a substantially nonheating relationship therewith, said base portions being substantially parallel to said springlike support arm and being curved in'the direction of insertion into the picture tube to provide minimal areas of contact with the tube wall for ease of slideable movement along the tube walls during insertion into or removal of the getter assembly from the tube and for the elimination of entanglement with other
  • the getter assembly of claim 1 in which the getter container has opposing inner and outer circular side walls and an annular floor member connecting said side walls to form an annular space into which the getter material is pressed.
  • the getter assembly of claim 2 which additionally comprises a mounting bar extending across the bottom of the getter container and joined at opposite points on the underside of the floor member, with the wire support member arranged transversely of the mounting bar and joined at its mid-point to the mounting bar, the two end portions of the wire support member being each bent in a plane parallel to the mounting bar, first in a downward direction and then in an upwards direction to form curved bases for supporting the getter container off the wall of the electron tube.
  • the getter assembly of claim 3 which the wire support is a wire of generally circular cross section flattened at its mid-point for attachment to the mounting bar.
  • the getter assembly of claim 3 which the mounting bar is a metallic strip having a flat undersurface for attachment of the wire support member and for attachment of an antenna support arm.
  • the getter assembly of claim 2 in which the getter container has a solid center piece having a depending skirt portion around its periphery which forms the inner circular wall of the annular space for holding the getter material.

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
US00369241A 1973-06-12 1973-06-12 Getter assembly Expired - Lifetime US3829730A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US00369241A US3829730A (en) 1973-06-12 1973-06-12 Getter assembly
CA201,813A CA1002104A (en) 1973-06-12 1974-06-06 Getter assembly
DE19742427342 DE2427342A1 (de) 1973-06-12 1974-06-06 Getter-anordnung
GB2576174A GB1476339A (en) 1973-06-12 1974-06-11 Getter
JP6564674A JPS5034160A (de) 1973-06-12 1974-06-11
NL7407789A NL7407789A (de) 1973-06-12 1974-06-11
IT51493/74A IT1013445B (it) 1973-06-12 1974-06-11 Perfezionamento negli assorbitori o affinatori di vuoto adatti in par ticolare per cinescopi

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00369241A US3829730A (en) 1973-06-12 1973-06-12 Getter assembly

Publications (1)

Publication Number Publication Date
US3829730A true US3829730A (en) 1974-08-13

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ID=23454697

Family Applications (1)

Application Number Title Priority Date Filing Date
US00369241A Expired - Lifetime US3829730A (en) 1973-06-12 1973-06-12 Getter assembly

Country Status (7)

Country Link
US (1) US3829730A (de)
JP (1) JPS5034160A (de)
CA (1) CA1002104A (de)
DE (1) DE2427342A1 (de)
GB (1) GB1476339A (de)
IT (1) IT1013445B (de)
NL (1) NL7407789A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4101247A (en) * 1976-05-12 1978-07-18 S.A.E.S. Getters S.P.A. Getter device with improved support member
US4323818A (en) * 1978-12-07 1982-04-06 Union Carbide Corporation Getter construction for reducing the arc discharge current in color TV tubes
FR2536206A1 (fr) * 1982-11-11 1984-05-18 Getters Spa Degazeur pour tubes a rayons cathodiques comportant un support de type ameliore
US4553065A (en) * 1982-11-23 1985-11-12 Saes Getters S.P.A. Getter assembly with improved support
FR2841685A1 (fr) * 2002-06-27 2004-01-02 Schott Glas Pince de maintien permettant de fixer des getters dans des recipients de section quelconque dans des systemes clos sous vide et recipient destine aux systemes clos sous vide, en particulier au tube collecteur

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0012359B1 (de) * 1978-12-07 1982-04-21 Union Carbide Corporation Getteranordnung für Kathodenstrahlröhren
US4335926A (en) * 1980-03-26 1982-06-22 Rca Corporation Method for vaporizing getter material in a succession of cathode-ray tubes
JPS5832187Y2 (ja) * 1981-04-27 1983-07-16 エツセ・ア・エ・エツセ・ゲテルス・エツセ・ピ・ア 改善された支持体部材を具備するゲツタ装置
US4431939A (en) * 1981-07-28 1984-02-14 Rca Corporation Structure and method for eliminating blocked apertures caused by charged particles
US4639231A (en) * 1985-09-23 1987-01-27 The Singer Company Retainer for electrically fired getter
JPH08129977A (ja) * 1994-10-31 1996-05-21 Sony Corp ゲッタースプリング及びこれを使用した陰極線管

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4101247A (en) * 1976-05-12 1978-07-18 S.A.E.S. Getters S.P.A. Getter device with improved support member
US4323818A (en) * 1978-12-07 1982-04-06 Union Carbide Corporation Getter construction for reducing the arc discharge current in color TV tubes
FR2536206A1 (fr) * 1982-11-11 1984-05-18 Getters Spa Degazeur pour tubes a rayons cathodiques comportant un support de type ameliore
US4535267A (en) * 1982-11-11 1985-08-13 Saes Getters S.P.A. Getter assembly with improved support
US4553065A (en) * 1982-11-23 1985-11-12 Saes Getters S.P.A. Getter assembly with improved support
FR2841685A1 (fr) * 2002-06-27 2004-01-02 Schott Glas Pince de maintien permettant de fixer des getters dans des recipients de section quelconque dans des systemes clos sous vide et recipient destine aux systemes clos sous vide, en particulier au tube collecteur
ES2241437A1 (es) * 2002-06-27 2005-10-16 Glas Schott Grapa de reten para la fijacion en posicion de afinadores de vacio en receptaculos de la seccion transversal que se desee en sistemas de vacio cerrados y receptaculos de cristal para el empleo en sistemas de vacio cerrados, en especial tubo colector.

Also Published As

Publication number Publication date
JPS5034160A (de) 1975-04-02
GB1476339A (en) 1977-06-10
IT1013445B (it) 1977-03-30
CA1002104A (en) 1976-12-21
DE2427342A1 (de) 1975-01-02
NL7407789A (de) 1974-12-16

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