发明授权
US3963947A Digital time delay relay utilizing logic elements 失效
数字时延延迟使用逻辑元件

Digital time delay relay utilizing logic elements
摘要:
Solid-state digital time delay relay having a pair of complementary contacts one of which breaks or opens before the other makes or closes. The switching or transfer function utilizes a light emitting diode in conjunction with a photosensitive resistive element for each set of contacts.
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