4. Radiant energy
  5. Photocells; circuits and apparatus
  6. Photocell controls its own optical systems

James H. May

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Drumhead dampening device

Music – Instruments – Drums
Reexamination Certificate

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Optical switch with tamper indicating feature for discouraging t

Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent

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Profile ID: LFUS-PAI-P-1628099

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