Projectors or projection-type viewers; Accessories therefor (devices for changing pictures G03B23/00)

Child Classifications

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• G03B 21/001
• G03B 21/003
• G03B 21/005
• G03B 21/02 Multiple-film apparatus
• G03B 21/06 affording only episcopic projection
• G03B 21/08 affording epidiascopic projection
• G03B 21/10 Projectors with built-in or built-on screen
• G03B 21/12 adapted for projection of either still pictures or motion pictures (prolonged exhibition of single frame G03B21/38)
• G03B 21/13 Projectors for producing special effects at the edges of picture, e.g. blurring
• G03B 21/132 Overhead projectors, i.e. capable of projecting hand-writing or drawing during action (epidiascopic projectors G03B21/08)
• G03B 21/134 Projectors combined with typing apparatus or with printing apparatus
• G03B 21/14 Details
• G03B 21/54 Accessories