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| A composite print in which the soundtrack is recorded via the varying width of a transparent track which runs beside the sequence of frames on a print. See also advance. | |||
| optical: 6 phrases in 5 subjects |
| Abbreviation | 2 |
| Military | 1 |
| Optics branch of physics | 1 |
| Telecommunications | 1 |
| United States | 1 |