"John Stumbles" wrote in
message
On Fri, 25 Dec 2009 09:03:41 -0500, Arny Krueger wrote:

Legacy crowbar - fire a thyratron.

If you can guarantee 99.9999% that it will fire whenever
you want it to.

BTDTGTTS

If its made with tubes, we can't even guarantee that the entire piece of
equipment will work 99.9999% of the time.

IOW the criteria of 99.9999% is unrealistically high.