BE407462A - - Google Patents

Info

Publication number
BE407462A
BE407462A BE407462DA BE407462A BE 407462 A BE407462 A BE 407462A BE 407462D A BE407462D A BE 407462DA BE 407462 A BE407462 A BE 407462A
Authority
BE
Belgium
Prior art keywords
light
screens
light beam
rays
filters
Prior art date
Application number
Other languages
English (en)
French (fr)
Publication of BE407462A publication Critical patent/BE407462A/fr

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/18—Fire preventing or extinguishing

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Elements Other Than Lenses (AREA)
BE407462D BE407462A (Direct)

Publications (1)

Publication Number Publication Date
BE407462A true BE407462A (Direct)

Family

ID=72247

Family Applications (1)

Application Number Title Priority Date Filing Date
BE407462D BE407462A (Direct)

Country Status (1)

Country Link
BE (1) BE407462A (Direct)

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