I found the secret of the door mechanism even as you did, Dr. Good- win.

Clickety sounds followed, as the door mechanism seemed to consider.

He busied himself making a better repair of the door mechanism.

The door mechanism had been damaged during an attack and never adequately repaired.

One of the Earth-humans had been gripping the door mechanism tightly to prevent it being opened from within.

As if on cue, the door mechanisms hummed and the panels opened wide.

It had been carved out of the solid rock, but again, offered no clue to the door mechanism.

Elizabeth looked up from her study of the door mechanism with some surprise.

By so doing he kept the door mechanism from ringing the bell that always announced the arrival of a customer.

A shot through the door mechanism sealed her off from the legionnaires.