AC transmission line parallelly erected with DC transmission lines
Air Leakage Rate of Air Preheater
air to air heat recovery unit
air to air missile launching envelope
arctic air [= arctic air mass]
continental air [= continental air mass]
main air port exhaust air
marine air [= marine air mass
variable air volume (VAV) air conditioning system
variable air volume air conditioning system
(pressure)gauge with transmission device
±500 kV ultrahigh voltage DC transmission line
±800 kV DC transmission system
097 Electrical Controlled Automatic Transmission
1 000 kV AC power transmission line
1 000 kV AC transmission
1 000 kV power transmission
1 000 kV transmission line