Safety fuel line with double walled fuel pipes - has viewing window with catalyst covering reacting with fuel leaking from inner pipe by changing colour
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Speed control circuit for brushless DC motor - has tachogenerator setting and resetting flip=flop that drives current-regulating transistor
US4095414A
Electronic timepiece
US4095413A
Electronic timepiece
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Twilight switch triggered by photoelectric component - uses bistable flip flop to switch on lamp circuit and prevents switch-off through time switch
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Protective switch for voltage sensitive appliances - has differential amplifier with two transistors as sensor for improper voltages
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Mechanical oscillator or rotor of electronic time keeper - permanent magnet dynamic drive system is controlled without contacts