AC proportional and resonant regulator
digital proportional integral differential control
Digital Proportional Relief Valve
Digital proportional-integral-differential
digital proportional-integral-differential controller
electro-hydraulic proportional governor valve
fixed and proportional spacing
measured factor and proportional factor
proportional and derivative feedback
Proportional and nonproportional loading
proportional_and_integral
quantized factor and proportional factor
servo and proportional valve
Analog and Digital Ground
analog and digital signals control
analogue and digital circuit
and Digital RF remote system