Photoelectric switch for use in sealed cases
作者： Michael Kaessner
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摘要: A switching apparatus and method are provided for employment in a sealed enclosure. The includes transparent window, light-emitting device, light-responsive device. window is part of an enclosure that to preclude infiltration ambient environment. configured placement object. device within the disposed closely adjacent first point window. emits light through into also second detect light. allows transmission Placement object interrupts detection by
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