Even the numerous robot guards allowed them to pass unhindered.

The man and woman, evidently intent on each other, had bumped into the robot guard.

Momentarily, he wondered what had happened to the robot guards of the building.

I had quite normally come in surrounded by robot guards.

Otherwise they could never have gotten past the robot guards and the energy screens.

Just as she reached the stairway, the door to it opened in her face and a robot guard started to come through.

He never did find out what they did with his robot guard.

There were only two robot guards in the room-the lowest number of any she had yet seen.

The price for such calm was that the robot guards had to remain in place.

And, come to think of it, the ubiquitous robot guards were more efficient than any lock could be.