4. Batteries: thermoelectric and photoelectric
  5. Photoelectric
  6. Cells

Douglas J. Williams

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Automatic signaling device

Signals and indicators – Horns – whistles and compressional wave generators
Patent

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Electric power generating lantern using forced air cooled...

Batteries: thermoelectric and photoelectric – Photoelectric – Cells
Reexamination Certificate

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Electro-acoustical structure

Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent

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Electronic parking meter and electric automobile recharging stat

Communications: electrical – Vehicle parking indicators
Patent

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Fluid filter and purifying apparatus

Liquid purification or separation – Particulate material type separator – e.g. – ion exchange or... – Spaced beds
Patent

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Profile ID: LFUS-PAI-P-765931

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