BE457637A - - Google Patents

Info

Publication number
BE457637A
BE457637A BE457637DA BE457637A BE 457637 A BE457637 A BE 457637A BE 457637D A BE457637D A BE 457637DA BE 457637 A BE457637 A BE 457637A
Authority
BE
Belgium
Application number
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
Publication of BE457637A publication Critical patent/BE457637A/xx

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
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/58—Projection screens collapsible, e.g. foldable; of variable area
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L13/00—Implements for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L13/02—Scraping
    • A47L13/04—Scraping with steel wool
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L13/00—Implements for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L13/02—Scraping
    • A47L13/06—Scraping with wire brushes or wire meshes
    • A47L13/07—Metal sponges

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
BE457637D 1941-07-23 1944-09-25 BE457637A (en))

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US912744XA 1941-07-23 1941-07-23

Publications (1)

Publication Number Publication Date
BE457637A true BE457637A (en)) 1944-10-31

Family

ID=22226942

Family Applications (1)

Application Number Title Priority Date Filing Date
BE457637D BE457637A (en)) 1941-07-23 1944-09-25

Country Status (2)

Country Link
BE (1) BE457637A (en))
FR (2) FR912744A (en))

Also Published As

Publication number Publication date
FR912774A (fr) 1946-08-20
FR912744A (fr) 1946-08-19

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