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Bridge strand inspection

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I'm contemplating specifying the wet fluorescent magnetic particle 
method (Magnaflux) and Hall-effect method (Magnograph) for inspecting 
1.5" to 2.25" diameter bridge strand, and I'd appreciate it if anyone 
has names/phone numbers of inspection agencies with experience using 
those techniques with bridge strand.

Thanks,
Dave Evans, P.E.
TNH, Inc.