back bearing

back-to-back circuit

back-to-back connection

back-to-back radio stations

back-to-back relay

back bearing housing

wind relative bearing / wind-relative bearing

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 blow

back contact

back cushion

back fork

back gun

back impact

back kick

back lamp

back lash

back of periscope