4. Electricity: measuring and testing
  5. Measuring, testing, or sensing electricity, per se
  6. With electromagnetic field

John A. Ayres

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Back lighting device

Illumination – Revolving
Patent

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Back lighting device with central opening frame member and a uni

Illumination – Revolving
Patent

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Closed loop carburetor air-fuel ratio control apparatus

Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Patent

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Electronic analogue compass

Geometrical instruments – Indicator of direction of force traversing natural media – Magnetic field responsive
Patent

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Frangible article

Amusement devices: games – Aerial projectile game; game element or accessory therefor... – Target
Patent

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Profile ID: LFUS-PAI-P-588952

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