mm Hg - nodulising drum
- multiple-hearth furnace
- multiplicity factor
- multistage furnace
- Muntz metal
- N
- Na
- narrowing
- native (free, massive) gold
- native (naturally-occurring) sulfur
- native antimony
- native copper
- native elements
- native iron
- native platinum
- native silver
- native sulfur
- natural aging
- natural chlorides
- natural chromates
- natural fuel
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