display to an audience. Many companies and small organizations use a system of projectors and transparencies in meetings and other groupings of people, though this system has been largely replaced by video projectors and interactive whiteboards.

Printing

Transparencies can be printed using a variety of technologies. In the 1960s and 70s the GAF OZALID "projecto-viewfoil" used a diazo process to make a clear sheet framed in cardboard and

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