R R arely is the adage “necessity is the mother of invention” embodied to the degree that it was in the early- to mid-’90s in Oklahoma City. Because only one sand and gravel producer was operating in the area, all grades of sand — particularly, better quality concrete sand — were in extremely short supply. The constant struggle to meet his ready-mix demands prompted Phillip Schwarz to do what any self- respecting entrepreneur would do: he entered

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