muff - nick
- muff-type ear protectors
- muffle
- mule-spinners' cancer
- multiple-tube collector
- murine typhus
- muscular fatigue
- muscular work
- mushroom worker's disease
- mushroom worker's lung
- mutagen
- mutagenesis
- mutagenic effect
- mutagenic substance
- mutagenicity
- mutation
- mycetoma
- mycetoma pedis
- mycosis
- mycotic allergy
- mycotic lung disease
- myoclonia
- naked flame
- narcotic action
- narcotic effect
- narrow-band analyser
- narrow-band noise
- nasal cancer
- National Institute of Occupational Safety and Health
- natural lighting
- natural ventilation
- near-accident
- neck curtain
- neck strap
- negligence
- neighbourhood protection
- nervous disturbances
- nervous fatigue
- neuralgic disorders
- neurasthenia
- neuritic disorders
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