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UNUSUAL ROTATING OR INTERMITTENT PRISMS
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photo for larger views) |
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Item No: L3997
Price: $12.00
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| Our understanding is that these were used in high quality moving picture projectors. They take the place of a shutter so that a flickerless picture may be projected. 8 sides, each is 12mm long by 5mm wide. Prism is 15mm diameter by 12mm long. |
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