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PCE
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Search for IPC and CPC classification codes or keywords
CPC Subgroup
G03B 21/12

adapted for projection of either still pictures or motion pictures (prolonged exhibition of single frame G03B21/38)

Full Title

Projectors or projection-type viewers; Accessories therefor (devices for changing pictures G03B23/00) > adapted for projection of either still pictures or motion pictures (prolonged exhibition of single frame G03B21/38)