The three dead victims and the wounded child were found in apartment 5L, after the police gained entry with the help of a mechanical robot.

Who could ever be sure if he were speaking with a human being or a mechanical robot?

Tech - a mechanical robot whose magical powers enable Buddy to take on different roles.

At Doc's voice, another mechanical robot put the record into operation.

The story is set in a future world where giant mechanical robots have landed on the Earth.

In general, the more mechanical a robot appears, the less threatening it is.

Asimov uses the "mechanical" robot to inquire about human nature.

Or was he merely a mechanical robot that moved only at Klaatu's commands?

The story takes place in the future where every family has a mechanical robot as a Nanny.

For a mechanical robot, it can be an engine.