| 摘要 |
1. A photoelectric control device, comprising a light source, a photodetector, an electrical switch actuated by the photodetector as a function of the light intensity received and a control element rigid with a reflecting element which control element may occupy two end positions, in one of which positions the light from the said source is directed towards the photodetector, characterised in that the device comprises display means disposed in such a way as to receive the light from the said source when the said control element is in the other of the end positions.
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