His chairs went through seven different prototypes, before arriving at the most comfortable version.

Although two different prototypes flew in 1937, it was not mass produced.

Both series weave youthful angst, lust and bad manners around water sports, but they follow different prototypes.

Clivus Multrum today has designed a number of different prototypes and sizes.

There are actually a couple of different prototypes.

The development of different national prototypes continued.

Different elements of the technology were to be tested with different prototypes.

Differences in regional scales give different prototype gauges to these different model track widths.

A different prototype is required for each order of filter in each class.

A number of different prototypes were evaluated.