You might find this web site helpful for bolt head marking data.
_http://www.unified-eng.com/scitech/bolt/boltmarks.html_
(http://www.unified-eng.com/scitech/bolt/boltmarks.html)
Bruce, AA4Z
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See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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