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acetylcholinesterase (ache) argon-mercury arc lamp auxies carbon black pneumoconiosis ch'ung t? chih wu critical solution temperature Elmer Ambrose Sperry hit the bull's-eye instrument for aerial photographic record legatine one-eighties passing gas pelton penceless postpyramidal fissure prionaces quenched gap sallees signet ring cell water pump seal retainer washer