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Strictly Surveying
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From a book titled "Reinforced Concrete Construction" dated 1912.
Posted : June 5, 2014 11:40 am
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All to avoid patent infringement.
Since the twisted bar had been around a very long time I am not sure it was patentable.
Paul in PA
Posted : June 5, 2014 11:53 am
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Are these occasionally found as old monuments? If so, I'd guess mostly in cities?
Posted : June 5, 2014 2:54 pm
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jeery, where's the Stilson bar?
Posted : June 6, 2014 11:00 am