“Charles F. Brannock only invented one thing in his life, and this was it. The son of a Syracuse, New York, shoe magnate, Brannock became interested in improving the primitive wooden measuring sticks that he saw around his father’s store. He patented his first prototype in 1926, based on models he had made from Erector Set parts. As the Park-Brannock Shoe Store became legendary for fitting feet with absolute accuracy, the demand for the device grew, and in 1927 Brannock opened a factory to mass produce it. The Brannock Device Co., Inc., is still in business today. Refreshingly, it still only makes this one thing. They have sold over a million, a remarkable number when one considers that each of them lasts up to 15 years, when the numbers wear off.”

[Read more of this interesting article by Michael Bierut at Design observer]