Are you sure about that 8D? Wasn't the precursor to the 8D the 6D, which has
the usual four rotor valves? I once had in my possession, with the oppurtunity
to buy, a very early Conn double that I was told was made in the 30's or 40's.
It was a Schmidt copy in every way, with three rotors and the piston change
valve. Has anyone else heard of a Conn with three piston valves?
.
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