obse - over
- open
- open cut / cutting / excavation
- open fire
- open line
- open river / water
- open set
- open space
- open tapped
- open up
- open wiring
- open-air
- open-cast / open-cut / open-work mining
- open-end hole
- open-ended spanner
- open-hearth furnace
- open-impeller pump
- open-link
- open-link chain
- open-loop control
- open-out
