Although it is not known whether the game was fully completed, a 90% complete prototype of the game was auctioned on eBay in 2006.

The number of produced prototypes is not known, but at least one complete prototype, and one chassis for exhibitions were built.

Test rides on the complete prototype began in December 1947 and showed that the combination of long travel and soft springs needed damping.

In fact they only managed to produce one complete prototype of each, before the semi-completed production batch was transferred to another factory.

He's big, strong and fast - your complete prototype tight end.

A working system was demonstrated in December 2003, and in June 2004 the first complete prototype could be tested.

The two complete prototypes were broken up for firewood in November 1919.

The work culminated in the fabrication of a complete prototype.

A delta-wing tactical fighter project, based on the S-2, cancelled with the prototype nearly complete.

No complete prototype was ever built.