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  • R. R. LUN DAM CONSTRUCTION Filed Oct. 21, 1930 Patented Jan. 19, 1932 UNITED STATES PATENT; OFFICE ROWLAND RESCUE LUN, OF LEWISBUBG, TENNESSEE DAM CONSTRUCTION This invention relates to improvements in superdam construction and comprises a. plurality of pivoted boards formed of metal, wood, or other material arranged across the top of the dam in a stepped fashion having tripping means operable upo
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