BE445276A - - Google Patents

Info

Publication number
BE445276A
BE445276A BE445276DA BE445276A BE 445276 A BE445276 A BE 445276A BE 445276D A BE445276D A BE 445276DA BE 445276 A BE445276 A BE 445276A
Authority
BE
Belgium
Prior art keywords
screen
groups
group
perforated
small
Prior art date
Application number
Other languages
English (en)
French (fr)
Publication of BE445276A publication Critical patent/BE445276A/fr

Links

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS 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
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/54Accessories
    • G03B21/56Projection screens
    • G03B21/60Projection screens characterised by the nature of the surface
    • G03B21/606Projection screens characterised by the nature of the surface for relief projection

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Overhead Projectors And Projection Screens (AREA)
BE445276D BE445276A (enrdf_load_stackoverflow)

Publications (1)

Publication Number Publication Date
BE445276A true BE445276A (enrdf_load_stackoverflow)

Family

ID=101703

Family Applications (1)

Application Number Title Priority Date Filing Date
BE445276D BE445276A (enrdf_load_stackoverflow)

Country Status (1)

Country Link
BE (1) BE445276A (enrdf_load_stackoverflow)

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