open-frame
open-gate
open-grained
open-grid
open-hearth
open-hole
opening
open-jaw
open-lap
open-link
  open-loop
open-mouth
open-neck
openness
open-office
open-pass
open-phase
open-pile
open-pit
open-plan
open-rate

    open-loop stepping motor

    шаговый двигатель без обратной связи, шаговый электродвигатель без обратной связи