| 摘要 |
Equipment for producing projected visual light displays in which light from a light source is shone through a moving or rotating screen or fan and then and then through a transparent sheet onto a surface of which a substantial part of the transparent sheet is opaque and which opaque parts are distributed so that the transparent parts of the sheet are positioned in one or more separate areas, the light source is preferably elongated and shines through both sides of the fan.
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