open-side
open-sight
open-stope
open-top
open-tub
open-type
open-weave
open-wire
openwork
operand
  operating
operating-lever
operation
operational
operative
operator
ophtalmoscope
ophthalmic
opportunity
oppose
opposed-piston

    operating lever latch knob

    стопор защелки рукоятки затвора