four-head
four-high
Fourier
Fourier-transform
four-impulse
four-jet
four-knife
four-layer
four-leg
four-level
  four-line
four-lobed
four-oar
four-oared
four-pass
four-plate
four-point
fourpolar
four-pole
four-port
four-probe

    four-line billet switch

    распределитель заготовки по калибрам валков для прокатки проволоки в четыре нитки