G03B 23/02
Devices for changing pictures in viewing apparatus or projectors in which a picture is removed from a stock and returned to the same stock or another one; Magazines therefor
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Edits on 16 Mar, 2022
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Edits on 5 Mar, 2022
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G03B 23/02
Devices for changing pictures in viewing apparatus or projectors in which a picture is removed from a stock and returned to the same stock or another one; Magazines therefor
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