The design proved to be so correct, that only a couple of minor changes were made for manufacturing.

The design proved to be too radical though and never went into mass production.

The simple but practical design has proven to be very popular.

A surprisingly simple design, this has proven more effective than its ancestors.

When the design proved no more successful as a racer it was finally put to rest.

Her original plan involved a moving eye light inside the internal plate, but the design proved too complicated.

In practice the design proved to have serious problems.

The design of the S1 has proved to be very popular:

The design did not prove a success, however, and only eleven were built, with three different engine types.

This design proved to be the most efficient in terms of cost and reliability.