4. Communications: directive radio wave systems and devices (e.g.,
  5. Return signal controls external device

Nils Bjelk

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Apparatus for controlling the opening and closing of doors

Communications: directive radio wave systems and devices (e.g. – Return signal controls external device
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Device for detecting objects, particularly such in motion

Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
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Profile ID: LFUS-PAI-P-816674

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