They are mechanically simple, making for reliability and long life.

It looked, and was, mechanically simple, but its theoretical implications were enormous.

It is mechanically simpler, but has drawbacks as a result.

These early machines were relatively small, mechanically simple and designed to sit on a counter or bar top.

The missile also has a mechanically simple but effective system for thrust-vectoring.

It was mechanically simple, but it moved with grace and intelligence.

While making the pistols heavier, this design also makes them mechanically simple and easy to maintain.

Rim brakes are inexpensive, light, mechanically simple, easy to maintain, and powerful.

They are robust and mechanically simple (and therefore easy to maintain).

Mechanically simple with a small footprint, the paternoster was easy to use in many places, including inside buildings.