FR863054A - Blackout device - Google Patents

Blackout device

Info

Publication number
FR863054A
FR863054A FR863054DA FR863054A FR 863054 A FR863054 A FR 863054A FR 863054D A FR863054D A FR 863054DA FR 863054 A FR863054 A FR 863054A
Authority
FR
France
Prior art keywords
blackout device
blackout
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
Clement Hellegers
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 FR863054A publication Critical patent/FR863054A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
FR863054D 1940-01-24 1940-01-24 Blackout device Expired FR863054A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR863054T 1940-01-24

Publications (1)

Publication Number Publication Date
FR863054A true FR863054A (en) 1941-03-22

Family

ID=9343069

Family Applications (1)

Application Number Title Priority Date Filing Date
FR863054D Expired FR863054A (en) 1940-01-24 1940-01-24 Blackout device

Country Status (1)

Country Link
FR (1) FR863054A (en)

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