On Thu, Jan 20, 2011 at 10:54 PM, Ron Nossaman <rnossaman at cox.net> wrote: > On 1/20/2011 9:41 PM, Conrad Hoffsommer wrote: > >> My guess is to prevent torquing or rolling the bridge. >> > > Good guess. > Ron N > Do bridges roll? William R. Monroe -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/caut.php/attachments/20110121/8a1b345b/attachment.htm>
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