All over Britain last week, workmen were using a strange new construction material that looked amazingly like sections of a toy Erector set and worked much the same way. The material was the Dexion Slotted Angle, a slotted steel strip bent to form a right angle and designed to be bolted on to other strips ad infinitum. Ever since it went on sale five years ago, it has been used as the frame for everything from waste baskets to cradles for huge water towers. Among its most enthusiastic buyers is the U.S. Air...

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