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In the Texas history column, Ken Bridges reflects on the life of Leonard Northrup, an inventor who helped improve life for all in the 20th century

United statesSouthern methodist universityTrinity universitySan antonioCurtis mathesLeonard northrupMernie myersLeonardl northrup jrJane keliherNorthrup energyBoard of trustees trinity universitySouthern methodistAmerican limestone