4. Communications: electrical
  5. Audible indication
  6. Ultrasonic pest control

Donald E. Black

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Direct reading digital colorimeter

Optics: measuring and testing – By shade or color – Fluid color transmission examination
Patent

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Multiple tone signaling device

Communications: electrical – Audible indication – Ultrasonic pest control
Patent

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Training bat system

Games using tangible projectile – Playing field or court game; game element or accessory... – Practice or training device
Reexamination Certificate

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Training bat system

Games using tangible projectile – Playing field or court game; game element or accessory... – Practice or training device
Reexamination Certificate

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Profile ID: LFUS-PAI-P-140133

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