4. Electricity: electrical systems and devices
  5. Electrostatic capacitors
  6. Variable

Daniel R. Sparks

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Inductive speed sensor employing phase shift

Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent

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Lighted keytop

Printing and office machinery – Typewriter or calculator – Element or attachment
Patent

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Low profile keyboard switch

Electricity: electrical systems and devices – Electrostatic capacitors – Variable
Patent

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Low profile keyboard switch

Electricity: electrical systems and devices – Electrostatic capacitors – Variable
Patent

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Space bar for low profile keyboards

Typewriting machines – Key-board or key lever-actuating mechanism – Key lever or space-bar mounting structure
Patent

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Profile ID: LFUS-PAI-P-758896

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