Thanks Daryl, 644040 is the one I was looking for. Wonder why it didn't come up when I was searching under Harrington & Richardson with the dates bracketted? I got the one a week later 644,402?!? Two of the other Patents were were also Martin Bye assigned to H&R, another by Homer M. Caldwell which I can't see how it possibly applies, and finally one by Andrew Hanson.