auto - ball
- autofeed drifter
- automatic cathead
- automatic choke
- automatic chuck
- automatic control
- automatic feed
- automatic feed drill
- automatic feedoff
- automatic fuel supply
- automatic power slips
- automatic pressure controller
- automatic recording indicator
- automatic remote control
- automatic retraction device
- automatic rotation stoper
- automatic sampler
- automatic spark control
- automatic speed governor
- automatic spider
- automatic temperature controller
- automatic temperature recording controller
- automatic training idler
- automatic weight control
- automatically rotated stoper drill
- automatically-variable governor
- auxiliaries
- auxiliary
- auxiliary engine
- auxiliary hoist
- auxiliary packer
- auxiliary valve
- av. eff.
- availability
- availability of oil
- available
- available power
- available surface
- average life
- average output
- average performance
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