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Show Steel company sets 75th anniversary fete Pittsburgh - DesMoines Steel Company is making plans to celebrate its 75th anniversary. The Provo operation of P-DM dates back approximately 20 years when Keyes Tank Company Com-pany of Casper, Wyoming-, opened op-ened a plant here. Hammond Iron Works purchased Keyes Tank Company in 1953 and merged with Pittsburgh-Des . Moines Steel Company in 1959. ' P-DM had its origin in Des Moines, Iowa 75 years ago and : it is planned to celebrate the event with an open house May 11 from 10 a.m. until 3 p.m. which will include a tour of the facilities, movie, refreshments, etc. |