Devices for changing pictures in viewing apparatus or projectors

Child Classifications

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• G03B 23/02 in which pictures are removed from, and returned to, magazines; Magazines therefor
• G03B 23/08 in which pictures are attached to a movable carrier
• G03B 23/14 Carriers operable to move pictures into, and out of, the projection or viewing position and carrying one or two pictures only in a removable manner (G03B23/18 takes precedence)
• G03B 23/18 with fade-in and fade-out effects