4. Radiant energy
  5. Photocells; circuits and apparatus
  6. Optical or pre-photocell system

Henri Vähä-Ypyä

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Method and apparatus for self-monitoring of proximity sensors

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
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Switch arrangement and a switch matrix structure for a keypad

Coded data generation or conversion – Bodily actuated code generator – Including keyboard or keypad
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Profile ID: LFUS-PAI-P-2771697

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