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Draw Bridge Mechanicals...........
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collegeboy
Posted 4/8/2009 23:26 (#674209 - in reply to #673922)
Subject: Re: Draw Bridge Mechanicals...........



Slicker than a Yes album.		Counterweight is good. If I remember correctly, the lift bridge in Duluth, MN only requires a 50hp motor to lift it.

http://en.wikipedia.org/wiki/Aerial_Lift_Bridge
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