73190051
Oct 20, 1978
Apr 7, 1981
Meters and Metering Equipment-Namely, Relay and Control Panels, Switch Gear Systems, and Computer Programs Recorded on Tape, Cards, and Discs
Electrical and Scientific ApparatusMaintenance and Repair of Meters and Metering Equipment-Namely, Relay and Control Panels, Switch Gear Systems, and Computers
Building Construction and Repair