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Designed in 1933, this is a series one catkin. See
the 
article at the
National Valve Museum or this one
at the Virtual Valve Museum for details of the short lived
catkin design.
This page last modified - Monday, 29-Mar-2010 14:25:37 BST, rendered - Saturday, 19-May-2012 18:05:29 BST
for (none) 38.107.179.233 by www.andycowley.org
