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US4621311A
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High-speed switching regulator
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Shielded transformer
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Voltage stabilizing and harmonic suppression transformer systems
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Start-stop pulse generators
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Magnetic vibratory chopper
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Control circuits for electric motors
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Electromagnetic switches of the make-before-break type
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Tuning fork type relays
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Electromagnet vibrator reed switches
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Vibratory capacitors
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Tuning fork type oscillators
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Electromagnetic switches
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Electromagnetic switches
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Revolution indicating systems
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Magnetic switches
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Vibratory capacitors
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Frequency doubling choppers
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Magnetic switch
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US2504101A
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Relay
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US2458735A
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Electric pressure and deflection gauge
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