Then we heard the whine of a pneumatic door.

He glanced up sharply when Holly entered through the pneumatic double doors.

Nohar could start making things out in the gloom, like the pneumatic doors opening on the frank's van.

He slammed his left fist at one of the dangling pneumatic doors.

It took only a moment before the pneumatic door swished open and Data entered.

The new trains also sported closed passenger compartments (with windows that could be opened) and pneumatic doors.

The pneumatic doors hissed open and the captain came in.

The hovercraft's engines stopped and the pneumatic doors hissed open.

Cars with sliding pneumatic doors were ordered in 1919 for the Piccadilly line.

The car glided to a stop in its terminal at the foot of the mountain and its pneumatic doors slid open.