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temperature measurement temperature & process meters, industrial timers and counters signal conditioners and transmitters temperature & process controllers and power switching devices general test and measurement instruments recorders superconductivity and cryogenics temperature measurement pressure...
for earth leakage detection: those that are voltage-operated and those that are current-operated. the voltage-operated devices are no longer used but, for completeness, they consisted of a coil connected in series in the earthing conductor or between the metalwork of the installation and an auxiliary...
counters and counting circuits h k; clockwork for advertising g f / ; devices for time computing where an unknown may be determined g b) [g b / ] (class / ) clocks or watches with indicators for tides, for the phases of the moon, or the like (planetaria g b / / ; arrangements for table reference, e.g...