back open dart

back press roller

angles back to back

Back filling at abutment back of Bridge or culvert

back reaming and back transportation

back to back

back to back houses

Back-to-Back

open window theory

2-D open channel

3-D open cells network structure

3-D open cells structure

3rd stage open channel closure

4-way open T equipment

88open

a smooth open contour

abandoned open pit

Absolute Open Flow

Absolute Open Flow Capacity

Absolute Open Flow Potential