trip - ultr
- two-deck jumbo
- two-deck platform
- two-dimensional nucleus
- two-dimensional state of stress
- two-dimensional stress
- two-disk bit
- two-drum
- two-drum slusher
- two-drum winch
- two-entry development
- two-handed work
- two-hole spread
- two-lane
- two-layer
- two-leaf grab bucket
- two-leg shield
- two-level
- two-lift mining
- two-line clamshell
- two-log washer
- two-machine operation
- two-pass continuous miner
- two-pass method
- two-pass mining
- two-phase
- two-phase concentrate technology
- two-phase flow
- two-phase separation
- two-piece
- two-piece set
- two-ply
- two-point bit
- two-post head frame
- two-prong rotary bit
- two-prop shield support
- two-rim
- two-roll
- two-roll screen
- two-roller bit
- two-row method
