lowe - mean
- Mannington type elevator
- mantle
- manual control
- manual feed
- manual priming
- manufacture
- Manus tester
- many-staged
- marbles
- marcel disk
- marginal development
- marine drilling
- marker block
- marker formation
- Marline spike
- marry the ropes
- Marsh funnel
- mashed (in slips)
- masonry bit
- mass flow
- mast
- mast head
- master
- master borer
- master clutch
- master control gate
- master drive clutch
- master gate
- master switch
- master valve
- matching of machine and bit
- mating
- matrix
- mature mud
- Maud
- maximum allowable working pressure
- maximum output
- maximum permissible r.p.t.
- maximum permissible torcpie
- maximum speed
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