4. Music
  5. Instruments

S. J. Witkowski

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AC Motor drive system having clamped command error signal

Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent

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Accessory device for photographic camera

Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent

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Acoustic output device for personal computer

Music – Instruments
Patent

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Acoustic tone inhibiting means for keyboard musical instrument

Music – Instruments
Patent

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Alarm electronic watch

Horology: time measuring systems or devices – Chronological – With simultaneous time indicating means
Patent

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Profile ID: LFUS-PAI-P-4536

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