control charactercontrol circultcontrol countercontrol electrodecontrol elementcontrol gridcontrol planecontrol pointcontrol registercontrol relaycontrol signalcontrol stick steeringcontrol systemcontrol transformer control synchrocontrol unitcontrol variablecontrol windingcontrollabilitycontrollablecontrolled avalanche devicecontrolled sourcecontrollercontrovercyconvection coolingconvection currentconvection current modulationconvective dischargeconventionalconventional functionconventional voltage doublerconvergenceconvergence coilconvergence controlconvergence electrodeconvergence magnet beam magnetconvergence planeconvergence sublayerconvergence surfaceconvergence zoneconversationalconversational modeconversational style programconversational typeconverseconversion efficiencyconversion fractionconversion gain ratioconversion timeconvertconvert channel