зовнішній (пустотілий) вал (нижнього несучого гвинта)
upper and lower coaxial rotors
through shaft (of upper coaxial rotor)
coaxial-rotor helicopter
coaxial rotors
coaxial machine gun
coaxial mounting
coaxial
propeller shaft (drive shaft)
counter-hollow charge projectile protective screen
hollow base
hollow charge
hollow charge antitank hand grenade
hollow charge projectile
hollow square
hollow(-cone) charge
beat hollow
square formation (infantry square, hollow square)
hollow cone charge
hollow-base bullet
hollow-charge ammunition
hollow-charge shell
hollow-point bullet
hollow-pointed bullet
hollow-stern valve
jacketed hollow-point bullet
hollow rivet
hollow grind
charge hollow
hollow-point bullet (HP)
at lower echelons
Forces of Lower Readiness (FLR)
land-based lower layer (LBLL)