> There are several groups who are demonstrating sustained operation of
> devices using the same principle
Wrong. There have been a string of groups that claim wonderful
results, but these results are always different (and different
from P&F's claims), irreproducible, and quickly fall out of sight.
It's enough to keep the thought-impaired true believers in a state
of faith, though.
The obvious explanation for the results is that these groups are
engaged in fraud or incompetence. Kind of like some of P&F's work
(the radiation measurements.)
Paul