Unfortunately, however, Eugène Martin never got through the hurdles necessary to put his promising design into series production.

Thus the Semovente da 149/40 prototype remained the sole example of what seemed to be a promising design.

The team eventually decided to move directly to the more promising axial design, and started real work on the TR.3 in 1945.

I have also learned that the most promising designs don't necessarily become production cars, while some head-scratchers - Aztek, anyone?

G.M. will soon introduce a clutch of models with promising designs.

The many modifications that resulted turned the promising design into a "hapless and grotesque-looking hybrid."

However, most research has focused on building adiabatic logic, which is a promising design for low power applications.

By ensuring that only the most promising designs enter the wind tunnel, it has made physical evaluation more cost effective.

At the time the most promising design was the .276 Pedersen.