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Diefenderfer Eletrical Contractors and Technology Solutions: Serving the Lehigh Valley region since 1920, we've remained dedicated to maintaining our status as the area's most experienced electrical contractor and telecommunications resource. Our customer list includes some of the area's finest schools, residences, commercial, institutional, and industrial complexes. Our convenient location and more than 200 motivated multi-disciplined technicians can provide the competitive electrical and telecommunications tools needed for your business to succeed.