automatic back bias

bias error

bias stability error

user clock time bias error

service bias

back-to-back circuit

back-to-back connection

back-to-back radio stations

back-to-back relay

semi-automatic pistol (automatic pistol)

automatic heavy barrel rifle / heavy barrel automatic rifle

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