midg - muff
- midget impinger
- midget scrubber
- milkers' nodules
- milkers' warts
- millstone dresser's silicosis
- millworker's asthma
- mine fire
- mine gas
- mine rescue station
- mine rescue team
- mine ventilation
- miner's cramps
- miner's nystagmus
- miner's phthisis
- miniature methanometer
- minimum age for employment
- minute volume
- misfire
- mist
- mist eliminator
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