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York Eb Helicon
http://forums.chisham.com/viewtopic.php?f=3&t=41262
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Re: York Eb Helicon
Posted:
Wed Oct 20, 2010 1:59 pm
by
windshieldbug
It has the 1910 patent H/L pitch loop, and I think it much more likely that the serial number is actually "30779", putting it at c.1912 in my estimation