By far the most common mechanical improvement is the tuning or complete replacement of the engine.

He was also the inventor of many mechanical improvements in colliery working.

It was similar to the NS-23, but mechanical improvements increased its rate of fire by more than 50%.

The upgrade also include mechanical improvements which would extend the useful life of these units by 10 years.

Aside from styling, 1990 marked a number of mechanical improvements to the 740 series.

It shared the same body, but included a number of mechanical improvements.

There were to be no mechanical or electrical improvements.

Devoted his time to developing various mechanical improvements, which he patented.

This included visual, mechanical and quality improvements over the earlier versions.

Other work being done includes mechanical, structural and architectural improvements.