CH595649A5CH982975ACH982975ACH595649A5CH 595649 A5CH595649 A5CH 595649A5CH 982975 ACH982975 ACH 982975ACH 982975 ACH982975 ACH 982975ACH 595649 A5CH595649 A5CH 595649A5
Authority
CH
Switzerland
Application number
CH982975A
Inventor
Werner Theodor Wiesner
Original Assignee
Neckermann Versand Kgaa
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 by Neckermann Versand KgaafiledCriticalNeckermann Versand Kgaa
Publication of CH595649A5publicationCriticalpatent/CH595649A5/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