4. Radiant energy
  5. Photocells; circuits and apparatus
  6. Optical or pre-photocell system
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Key input apparatus with light-shielding plates and liquid cryst

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

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Key operated lock mechanism with mixed mechanical and electric c

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

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Keyboard and switches for keyboards

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

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Keyboard musical instrument having easily installable...

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

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Keying apparatus with thumb gap

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

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Knock mode scanning near-field optical microscope

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

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