FR831793A - Device for the darkening of light sources in rooms and in particular stairwells - Google Patents

Device for the darkening of light sources in rooms and in particular stairwells

Info

Publication number
FR831793A
FR831793A FR831793DA FR831793A FR 831793 A FR831793 A FR 831793A FR 831793D A FR831793D A FR 831793DA FR 831793 A FR831793 A FR 831793A
Authority
FR
France
Prior art keywords
stairwells
darkening
rooms
light sources
sources
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
Emil Biehl
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 FR831793A publication Critical patent/FR831793A/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
    • H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
FR831793D 1938-01-08 1938-01-08 Device for the darkening of light sources in rooms and in particular stairwells Expired FR831793A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR831793T 1938-01-08

Publications (1)

Publication Number Publication Date
FR831793A true FR831793A (en) 1938-09-14

Family

ID=9294005

Family Applications (1)

Application Number Title Priority Date Filing Date
FR831793D Expired FR831793A (en) 1938-01-08 1938-01-08 Device for the darkening of light sources in rooms and in particular stairwells

Country Status (1)

Country Link
FR (1) FR831793A (en)

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