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FR838891A - Method and apparatus for lighting coal mines and other places with explosive atmospheres - Google Patents

Method and apparatus for lighting coal mines and other places with explosive atmospheres

Info

Publication number
FR838891A
FR838891A FR838891DA FR838891A FR 838891 A FR838891 A FR 838891A FR 838891D A FR838891D A FR 838891DA FR 838891 A FR838891 A FR 838891A
Authority
FR
France
Prior art keywords
places
coal mines
explosive atmospheres
lighting coal
lighting
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
Other languages
French (fr)
Inventor
Joseph Fodor
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 filed Critical
Application granted granted Critical
Publication of FR838891A publication Critical patent/FR838891A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/24—Circuit arrangements in which the lamp is fed by high frequency AC, or with separate oscillator frequency
    • H05B41/245—Circuit arrangements in which the lamp is fed by high frequency AC, or with separate oscillator frequency for a plurality of lamps
FR838891D 1937-06-03 1938-06-03 Method and apparatus for lighting coal mines and other places with explosive atmospheres Expired FR838891A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB838891X 1937-06-03

Publications (1)

Publication Number Publication Date
FR838891A true FR838891A (en) 1939-03-17

Family

ID=10554401

Family Applications (1)

Application Number Title Priority Date Filing Date
FR838891D Expired FR838891A (en) 1937-06-03 1938-06-03 Method and apparatus for lighting coal mines and other places with explosive atmospheres

Country Status (1)

Country Link
FR (1) FR838891A (en)

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