Very interesting letter. Engine was retrofitted 1

Very interesting letter. Engine was retrofitted 15 years ago. Five years later they were astonished at only two moving parts. Invested in Coates at that time and declared it to be "The Wave of the Future". Must be the slowest moving wave in history as 10 years have now passed and George is still in the show and tell nothing mode. It obviously works. Only a few things could be holding things up. 1-Ability to be mass produced. 2-Price. 3-Durability. 4-Willingness to sell. Could it be George is quite happy tinkering with his expensive hobby?