CH497242A - Verfahren und Vorrichtung zur abtragenden Materialbearbeitung mittels Strahlungsenergie - Google Patents

Verfahren und Vorrichtung zur abtragenden Materialbearbeitung mittels Strahlungsenergie

Info

Publication number
CH497242A
CH497242A CH840268A CH840268A CH497242A CH 497242 A CH497242 A CH 497242A CH 840268 A CH840268 A CH 840268A CH 840268 A CH840268 A CH 840268A CH 497242 A CH497242 A CH 497242A
Authority
CH
Switzerland
Prior art keywords
radiant energy
material processing
removing material
radiant
energy
Prior art date
Application number
CH840268A
Other languages
English (en)
Inventor
Dieter Dr Koenig
Edgar Dr Meyer
Geissler Joachim
Heinz Steigerwald Karl
Original Assignee
Steigerwald Strahltech
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 Steigerwald Strahltech filed Critical Steigerwald Strahltech
Publication of CH497242A publication Critical patent/CH497242A/de

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00Working by laser beam, e.g. welding, cutting or boring
    • B23K26/12Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
    • B23K26/123Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an atmosphere of particular gases
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/08Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
    • B01J19/081Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing particle radiation or gamma-radiation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K15/00Electron-beam welding or cutting
    • B23K15/08Removing material, e.g. by cutting, by hole drilling
    • B23K15/085Boring
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00Working by laser beam, e.g. welding, cutting or boring
    • B23K26/12Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00Working by laser beam, e.g. welding, cutting or boring
    • B23K26/12Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
    • B23K26/127Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an enclosure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00Working by laser beam, e.g. welding, cutting or boring
    • B23K26/16Removal of by-products, e.g. particles or vapours produced during treatment of a workpiece
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36Removing material
    • B23K26/38Removing material by boring or cutting
    • B23K26/382Removing material by boring or cutting by boring
    • B23K26/389Removing material by boring or cutting by boring of fluid openings, e.g. nozzles, jets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B26HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26FPERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/26Perforating by non-mechanical means, e.g. by fluid jet
    • B26F1/31Perforating by non-mechanical means, e.g. by fluid jet by radiation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/16Surface shaping of articles, e.g. embossing; Apparatus therefor by wave energy or particle radiation, e.g. infrared heating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/16Surface shaping of articles, e.g. embossing; Apparatus therefor by wave energy or particle radiation, e.g. infrared heating
    • B29C59/165Surface shaping of articles, e.g. embossing; Apparatus therefor by wave energy or particle radiation, e.g. infrared heating of profiled articles, e.g. hollow or tubular articles
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/06Surface hardening
    • C21D1/09Surface hardening by direct application of electrical or wave energy; by particle radiation
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/04Coating on selected surface areas, e.g. using masks
    • C23C14/046Coating cavities or hollow spaces, e.g. interior of tubes; Infiltration of porous substrates
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/04Coating on selected surface areas, e.g. using masks
    • C23C14/048Coating on selected surface areas, e.g. using masks using irradiation by energy or particles
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/02Details
    • H01J37/16Vessels; Containers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0838Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using laser
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0866Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using particle radiation
    • B29C2035/0877Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using particle radiation using electron radiation, e.g. beta-rays
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00Flat articles, e.g. films or sheets
    • B29L2007/008Wide strips, e.g. films, webs
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00Tubular articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00Other particular articles
    • B29L2031/737Articles provided with holes, e.g. grids, sieves
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S65/00Glass manufacturing
    • Y10S65/04Electric heat

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Toxicology (AREA)
  • Health & Medical Sciences (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • ing And Chemical Polishing (AREA)
  • Processing Of Solid Wastes (AREA)
  • Welding Or Cutting Using Electron Beams (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
CH840268A 1967-06-09 1968-06-06 Verfahren und Vorrichtung zur abtragenden Materialbearbeitung mittels Strahlungsenergie CH497242A (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEST026993 1967-06-09

Publications (1)

Publication Number Publication Date
CH497242A true CH497242A (de) 1970-10-15

Family

ID=7461222

Family Applications (2)

Application Number Title Priority Date Filing Date
CH833568A CH503803A (de) 1967-06-09 1968-06-05 Verfahren zur Behandlung der Innenflächen von Ausnehmungen
CH840268A CH497242A (de) 1967-06-09 1968-06-06 Verfahren und Vorrichtung zur abtragenden Materialbearbeitung mittels Strahlungsenergie

Family Applications Before (1)

Application Number Title Priority Date Filing Date
CH833568A CH503803A (de) 1967-06-09 1968-06-05 Verfahren zur Behandlung der Innenflächen von Ausnehmungen

Country Status (9)

Country Link
US (1) US3632398A (de)
AT (2) AT287427B (de)
BE (2) BE716298A (de)
CH (2) CH503803A (de)
DE (1) DE1621355A1 (de)
FR (2) FR1587060A (de)
GB (2) GB1217350A (de)
NL (2) NL6808137A (de)
SE (1) SE350420B (de)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3934109A (en) * 1972-06-23 1976-01-20 The Torrington Company Latch pivot for latch needle
FR2202421B1 (de) * 1972-10-10 1976-10-29 Thomson Brandt
FR2217118B1 (de) * 1972-10-25 1975-04-25 Alsacienne Atom
US4015100A (en) * 1974-01-07 1977-03-29 Avco Everett Research Laboratory, Inc. Surface modification
LU71852A1 (de) * 1975-02-14 1977-01-05
US4081655A (en) * 1975-08-22 1978-03-28 Caterpillar Tractor Co. Method of deburring intersecting drilled holes
US4093842A (en) * 1976-01-19 1978-06-06 General Motors Corporation Ported engine cylinder with selectively hardened bore
US4081892A (en) * 1976-11-01 1978-04-04 Flow Industries, Inc. Method of making composite structure
US4059876A (en) * 1976-11-03 1977-11-29 General Motors Corporation Method of alloying and forming a valve seat
US4157935A (en) * 1977-12-23 1979-06-12 International Business Machines Corporation Method for producing nozzle arrays for ink jet printers
JPS6029234A (ja) * 1983-07-11 1985-02-14 Mitsubishi Electric Corp ワイヤカツト放電加工用ワイヤ電極
FR2568154B1 (fr) * 1984-07-30 1987-07-17 United Technologies Corp Appareil de forage de trous par faisceaux d'electrons
GB8911391D0 (en) * 1989-05-18 1989-07-05 Humphreys Colin J Preparation of substrates
US5229163A (en) * 1989-12-21 1993-07-20 Hoffmann-La Roche Inc. Process for preparing a microtiter tray for immunometric determinations
US5841099A (en) * 1994-07-18 1998-11-24 Electro Scientific Industries, Inc. Method employing UV laser pulses of varied energy density to form depthwise self-limiting blind vias in multilayered targets
US5614114A (en) * 1994-07-18 1997-03-25 Electro Scientific Industries, Inc. Laser system and method for plating vias
US6280757B1 (en) 1997-05-22 2001-08-28 The Procter & Gamble Company Cleansing articles for skin or hair
US6225032B1 (en) * 1997-08-27 2001-05-01 Canon Kabushiki Kaisha Method for manufacturing liquid jet recording heads and a head manufactured by such method of manufacture
WO2002029845A2 (en) * 2000-10-04 2002-04-11 Plasmion Displays, Llc Method of fabricating plasma display panel using laser process
ATE323569T1 (de) * 2001-03-22 2006-05-15 Xsil Technology Ltd Ein laserbearbeitungssystem und -verfahren
GB0112234D0 (en) 2001-05-18 2001-07-11 Welding Inst Surface modification
CN1309527C (zh) * 2003-03-17 2007-04-11 三菱电机株式会社 激光加工方法
US7674997B2 (en) * 2006-10-17 2010-03-09 Johns Manville Spinner for fiberizing glass and method
DE102014004035A1 (de) * 2014-03-21 2015-10-08 Probeam Ag & Co. Kgaa Verfahren zum Erzeugen kleiner Bohrungen in Werkstücken
DE102019101351B4 (de) * 2019-01-18 2021-01-07 Dyemansion Gmbh Vorrichtung und Verfahren zur Oberflächenglättung von additiv hergestellten Formteilen aus Kunststoff

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3364087A (en) * 1964-04-27 1968-01-16 Varian Associates Method of using laser to coat or etch substrate
US3360398A (en) * 1965-03-11 1967-12-26 United Aircraft Corp Fabrication of thin film devices
FR1468426A (fr) * 1966-02-17 1967-02-03 Ibm Procédé d'usinage et de revêtement au moyen de rayons à grande énergie

Also Published As

Publication number Publication date
FR1587060A (de) 1970-03-13
GB1217350A (en) 1970-12-31
FR1587059A (de) 1970-03-13
SE350420B (de) 1972-10-30
NL6808137A (de) 1968-12-10
US3632398A (en) 1972-01-04
AT297171B (de) 1972-03-10
BE716298A (de) 1968-12-09
CH503803A (de) 1971-02-28
BE716334A (de) 1968-12-10
DE1621355A1 (de) 1971-05-13
GB1225804A (de) 1971-03-24
NL6808136A (de) 1968-12-10
AT287427B (de) 1971-01-25

Similar Documents

Publication Publication Date Title
AT297171B (de) Verfahren und Vorrichtung zur abtragenden Materialbearbeitung mittels Strahlungsenergie
AT265457B (de) Verfahren und Vorrichtung zur Materialbearbeitung mittels Strahlungsenergie
AT291876B (de) Vorrichtung und Verfahren zur Gewinnung kristalliner Fructose aus methanolischer Lösung
CH424078A (de) Verfahren und Vorrichtung zur Krebsdiagnose
CH486901A (de) Verfahren und Vorrichtung zum Durchführen von Verdampfungen
CH400405A (de) Verfahren und Einrichtung zur automatischen Fokussierung des Ladungsträgerstrahles in Geräten zur Materialbearbeitung mittels Ladungsträgerstrahl
CH461791A (de) Verfahren und Vorrichtung zum induktiven Beheizen von Formwerkzeugen
AT261076B (de) Verfahren, Vorrichtung und Gerät zur thermischen Materialbearbeitung mittels Laserstrahlen
CH464796A (de) Verfahren und Vorrichtung zum Gefriertrocknen
CH424665A (de) Verfahren und Vorrichtung zum Unterhalt von sanitären Apparaten
AT287038B (de) Verfahren und vorrichtung zur thermischen behandlung von schienen
AT288108B (de) Verfahren und Vorrichtung zur elektrolytischen Oberflächenbehandlung
CH503515A (de) Verfahren und Vorrichtung zum elektrischen Erhitzen von Gasen
AT272803B (de) Verfahren zur Materialbearbeitung mittels gebündelter Energiestrahlen
AT273168B (de) Verfahren und Vorrichtung zum Filtrieren
AT267457B (de) Verfahren und Vorrichtung zur Fertigstellung textiler schlauchartiger Erzeugnisse
AT293955B (de) Vorrichtung und Verfahren zum Verpacken
AT267101B (de) Verfahren und Vorrichtung zur Behandlung von Flachglas
AT288833B (de) Verfahren und Vorrichtung zur Käseherstellung
AT288458B (de) Verfahren und Vorrichtung zur Vakuumbehandlung von Stahlschmelzen
CH414321A (de) Verfahren und Vorrichtung zur Formung von Gegenständen
AT271357B (de) Verfahren und Vorrichtung zur kontinuierlichen Vergärung
CH501370A (de) Verfahren und Vorrichtung zur Wärmebehandlung von Nahrungsmitteln
AT292942B (de) Verfahren und Vorrichtung zur Behandlung von Gegenständen
CH483652A (de) Verfahren und Vorrichtung zur fotoelektrischen Belichtungssteuerung

Legal Events

Date Code Title Description
PL Patent ceased