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

Thomas D. Heidt

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Light counting system for convex articles

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
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Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
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Toy vehicle assembly with video display capability

Railways – Amusement – Optical illusion
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Profile ID: LFUS-PAI-P-851107

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