https://austworld-production.parttrap.com/en/catalog/node/civil-council-specified-sub-metering
Austworld - Sub Metering
sub metering
https://www.freepatentsonline.com/8949051.html
Apparatus and method for sub-metering of household devices - General Electric Company
general electric companysub metering
https://www.austworld.com.au/en/catalog/node/civil-council-specified-sub-metering
Austworld - Sub Metering
sub metering