| 摘要 |
A programme control device, preferably for a dissolving operation in a sound-film camera, is designed by means of two programme control discs, which are connected non-positively to one another by a spring, in such a way that they can, rotating in dependence on one another in the same or different directions, execute switching operations in a sequence, which operations can otherwise be carried out only by means of a directionally independent gear and relatively complicated contact tracks.
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