підтримувати, забезпечувати; дублювати
back-to-back circuit
back-to-back connection
back-to-back radio stations
back-to-back relay
back-up fire control
back-up system
cut back co-operation
I read back
play back kit
pull back
push back
read back
reverse engineering ( back- wards engineering)
Camel-back water pouch
Field Pack, Air Support Back
back brief / backbrief
peel back
back on the block
back-up circuit breaker
armor back plate
back bearing housing
back blow
back contact
back cushion
back fork
back gun
back impact
back kick
back lamp
back lash
back of periscope
back of the blade