LOS ANGELES - The U.S. Army wants to help masons avoid injury and fatigue-induced mistakes. It is developing an improved prototype of a scaffold-mounted, concrete-block-lifting device with a pickup arm that can position a 100-lb. block. "It's made to increase a mason's productivity," Jeffrey B. Kirby, a principal investigator on the project for the Army's Construction Engineering Research Laboratory in Champaign, Illinois told Engineering News-Record (ENR, 8-26-96).MAMA (Mechanically-Assisted Mason'
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