Rivets were replaced by nuts and bolts in steel girder construction, specifically in the WTC maybe one of the first to exclusively use nuts and bolts. "Good better best never let it rest" till your good is better and your better is your best (seen on cast water tanks in Australia) leaves out the "best of best" rivets that went into the center section. I wonder if there was a grading of nuts? (and bolts). There's a large nut factory "Star" on the NY State Thruway near Harriman that's been bought by Kiryas Joel the Hasidim town mostly for the wells then the State has to put in a pipe to the aqueduct (Catch 23).
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