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

Albin A. Hastbacka

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Electro-optical level

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent

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Electro-optical liquid level indicator

Measuring and testing – Liquid level or depth gauge
Patent

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Tactical integrated illumination countermeasure system

Radiant energy – Irradiation of objects or material
Reexamination Certificate

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Tactical integrated illumination countermeasure system

Radiant energy – Irradiation of objects or material
Reexamination Certificate

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Touch entry interactive cathode ray tube arrangement

Communications: electrical – Audible indication – Percussion-type sound producer
Patent

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Profile ID: LFUS-PAI-P-481231

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