His first engines, of 125 cc, were sold as proprietary engines to other manufacturers.

Beginning in 1911, Velie introduced a truck line, and began making a proprietary four-cylinder engine, though parts continued to come from suppliers.

They used a variety of proprietary engines before the first world war.

Both variants will be powered by specific proprietary engines unique to each brand.

Hercules started building motorcycles in 1904 and, for many years, designed its own chassis but used proprietary engines.

The move to open source will likely come many years after id Tech 5's release as a proprietary engine.

As with most American specialty truck manufacturers, the customer's choice of proprietary engines and transmissions have been available.

A proprietary engine developed by the company that produces RegexBuddy.

A few minor models were also made using various proprietary engines.

In 2007, the company had over 50 developers working on two teams, and owned all its proprietary engines, tools and technology.