English 
four-port
German 
Portuguese 
translation - four-port translate | English dictionary
- four-pole matrix
- four-pole network
- four-pole parameter
- four-pole transformation
- four-pole wave
four-port
- four-port circulator
- four-port network
- four-poster
- four-poster bed
- four-quad series array
- four-quadrant drive
- four-quadrant multiplier
- four-quadrant operation
- four-row
- four-speed gear
- four-step
- four-stroke
- four-terminal equation
- four-terminal network
- four-to-two-wire
- four-valued
- four-way box
- four-way system
- four-wheel
- four-wheel drive
- four-wheeler
- four-wire
- four-wire ...
- four-wire amplifier
- four-wire bus
