BE440884A - - Google Patents

Info

Publication number
BE440884A
BE440884A BE440884DA BE440884A BE 440884 A BE440884 A BE 440884A BE 440884D A BE440884D A BE 440884DA BE 440884 A BE440884 A BE 440884A
Authority
BE
Belgium
Prior art keywords
projection
hollow glass
glass body
walls
emi
Prior art date
Application number
Other languages
English (en)
French (fr)
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.)
Publication of BE440884A publication Critical patent/BE440884A/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/28—Envelopes; Vessels
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K7/00—Lamps for purposes other than general lighting
    • H01K7/02—Lamps for purposes other than general lighting for producing a narrow beam of light; for approximating a point-like source of light, e.g. for searchlight, for cinematographic projector

Landscapes

  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
BE440884D 1940-03-15 BE440884A (instruction)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE217544X 1940-03-15

Publications (1)

Publication Number Publication Date
BE440884A true BE440884A (instruction)

Family

ID=5830806

Family Applications (1)

Application Number Title Priority Date Filing Date
BE440884D BE440884A (instruction) 1940-03-15

Country Status (3)

Country Link
BE (1) BE440884A (instruction)
CH (1) CH217544A (instruction)
FR (1) FR870746A (instruction)

Also Published As

Publication number Publication date
CH217544A (de) 1941-10-31
FR870746A (fr) 1942-03-23

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