Legal status (The legal status 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 status listed.)
Expired
Application number
GB2104821A
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Individual
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Individual
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Publication date
Application filed by IndividualfiledCriticalIndividual
Priority to GB2104821ApriorityCriticalpatent/GB185927A/en
Publication of GB185927ApublicationCriticalpatent/GB185927A/en
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
G03B21/30—Details adapted to collapse or fold, e.g. for portability
Landscapes
Physics & Mathematics
(AREA)
General Physics & Mathematics
(AREA)
GB2104821A1921-08-081921-08-08Improvements in optical projection apparatus
ExpiredGB185927A
(en)