Resistance, weld, timer, robot, automation spot, seam, projection, brake shoes, drums, angular ring, nut, aircraft specifications, AC, SCR, power packs, electrode wear/compensation, DC, MF, invertors, current stepping, proportional valves, hi-lift, poke gun, retract, upslope, downslope, pre-heat, constant current, constant voltage, constant energy, dynamic, monitoring, control circuit breakers, earth detection/protection, weld counting, process inhibit for poor welds. Principal Customers/Markets Automotive, First/Second Tier Sheet Metal Industries.