Engineering Instruments, Inc., Peru, Indiana, 1958
Engineering Instruments Inc. started out as the Lawrence Engineering Service in 1938, employing 10 people. The company became know for the first 25-cent slide rule. The founders, Lee and Vivian Lawrence, divorced in 1947. The company became the wife's property, who gave it the new name. It lasted another 20 years until a fire destroyed the factory. Lee went on to found a plastics factory which, among other things, produced the Etch-a-Sketch toys. For more information, visit The Unique Lawrence.