neck - oil
- non-safety explosive
- non-safety-lamp mine
- non-separable rim
- non-silicotic mine
- non-silting velosity
- non-spin hoist cable
- non-spin rope
- non-spinning rope
- non-stop operation
- non-supported space
- non-tabular deposit
- non-tilt mine cage
- non-uniformity
- non-waste processing
- noncaking coal
- nonclog
- noncohensive
- nondelay-action
- nonexplosive
- nonfiery
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