I don't have the 12th Edition, but I've been buying the PPA since
the late 70's, and they've stayed pretty much the same from edition to
edition except for the updating of serial numbers for those companies
that are still producing pianos.
If you do a lot of appraising of newer pianos or want to find the
exact year of manufacture for newer instruments, it's worth the
investment.
--David Nereson, RPT
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://ptg.org/pipermail/pianotech_ptg.org/attachments/20090428/aef6f7d3/attachment.html>
This PTG archive page provided courtesy of Moy Piano Service, LLC