[Halld-tracking-hw] inner cdc shell

[Curtis A. Meyer]

This looks potentially interesting as an inner shell:

http://www.scandia-nh.com/pvc_tube.php

at least according to their web site, they can do 7.1 ID 20 mil
diameter tubes in PVS ....  curtis
-- 
Prof. Curtis A. Meyer		Department of Physics
Phone:	(412) 268-2745		Carnegie Mellon University
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