Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
Inventor
active
Apparatus and method for determining frequencies for system maxi
Apparatus for applying particular voltages to three-terminal cir
Telephone receiver-off-hook detector
Telephone receiver-off-hook-and-in-use detector
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Profile ID: LFUS-PAI-P-808344