#GSSI's Jami Harmon talks slab-on-grade tips and tricks in the June issue of Concrete Openings Magazine: http://ow.ly/dDLV50uSwhP #gpr #georadar #concreteinspection pic.twitter.com/Ufelj7WgMD
source https://twitter.com/GSSI_GPR/status/1148215608527478791
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