on e - oxid
- on entry to the casting unit
- on exit from the furnace
- open baking furnace
- open crucible
- open distribution unit
- open to the atmosphere cell
- open top baking furnace
- opening of a new smelter
- operating conditions
- operating crane / pot tending crane/assembly (PTA) / potroom crane
- operating crane / pot tending crane/assembly (PTA) / potroom crane
- operating efficiency
- operating intensity
- operating irregularity
- operating personnel
- operating temperatures
- Operation and Repairs of Power Plants Area
- operational procedures
- operator of the smelter
- order quantity
- output/removal of metal (aluminum)
- output/removal of metal (aluminum)
- outward raw materials
- overflow (cast iron overflow )
- overflow (cast iron overflow )
- overhead (traveling) crane/bridge/traveler
- overhead (traveling) crane/bridge/traveler
- overhead conveyor
- overhead power and free conveyor
- overseas smelting ventures
