LU73134A1LU73134ALU73134ALU73134A1LU 73134 A1LU73134 A1LU 73134A1LU 73134 ALU73134 ALU 73134ALU 73134 ALU73134 ALU 73134ALU 73134 A1LU73134 A1LU 73134A1
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LU
Luxembourg
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LU73134A
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Publication of LU73134A1publicationCriticalpatent/LU73134A1/xx
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