true - unco
- twin drum
- twin extruded tube
- twin mixing-heap bunker
- twin molding machine
- twin mosaic transducer
- twin rotating furnace
- twin travel ing crane
- twin traveling crane
- twin travelling crane
- twin-arc welding set
- twin-carbon arc
- twin-chambered furnace
- twin-electrode welding
- twin-flame torch
- twin-nozzle distribution
- twin-pot cinder car
- twin-screw conveyor
- twin-strand machine
- twinned-regenerator valve
- twinning machine
- twinning phenomenon
- twist boundary
- twist in torsion
- twisted objects
- twisted root
- twister plug
- twisting
- twisting force
- twisting guard
- twisting strain
- twisting strength
- twisting stress
- twisting test
- two casthouse blast furnace
- two iron-notch installation
- two sets of rolls
- two taphole casthouse
- two taphole furnace
- two-bar guide
- two-bell system