over - part
- overall collection efficiency
- overall noise level
- overall sound level
- overalls
- overbalancing
- overcurrent protection
- overcurrent protective device
- overcurrent relay
- overdose
- overexertion
- overexpansion
- overexposure
- overflow
- overhead bridging
- overhead protection
- overhead travelling crane
- overheating
- overload
- overload circuit-breaker
- overload indicator
- overload protection
- overpressure
- oversight
- overspeed governor
- overstrain
- overtravel limit switch
- overturning
- overvoltage protection
- overwinding cut-out
- oxidising
- oxidising agent
- oxidising atmosphere
- oxidising substance
- oxygen analyser
- oxygen breathing apparatus
- oxygen consumption
- oxygen cylinder
- oxygen cylinder rebreathing apparatus
- oxygen debt
- oxygen deficiency
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