poly-silicon back-seal

back-blade seal

face seal seal joint

angles back to back

Back filling at abutment back of Bridge or culvert

back reaming and back transportation

back to back

back to back arrangement

Back to Back Bus

Back to back charter

back to back connection

Back to Back Converter Station

back to back diodes

Back to back FX agreement

back to back houses

Back to back ionization chamber

Back to Back LC

Back to back loan

back to back repeater