оборонне кільце (напр. навколо Лондона в 1940 р.)
base junction; rotary collector ring (box); rotary base junction (of a tank); rotary connection; slip ring; traverse rotary base junction
life ring (ring buoy)
perimeter defense (all-around defense)
beach defense mine / beach-defense mine
base ring
breech ring (of firearm)
D-ring
gun ring
jet ring
retaining ring
safety-pin ring
stator ring
stiffener ring
X ring
power-slip ring
slinger ring
slip ring
slip-ring box
slip-ring terminal
fire extinguishing ring
sprocket ring
tie-down ring
trunnion ring
adjustable ring
adjusting nut ring
adjusting ring
barrel-magazine joint ring
bearing cap snap ring replacer set
bearing retainer ring
bearing ring
Broadwell ring
cam ring