An example of this pick turned up on eBay, marked "Harrington / Patented / Dec 12 / 1911". The 1914 R. L. Polk & Co.'s New York Corporation Directory lists "Contractor & Railroad Pick Co. (R.T.N.) (Frank S. Harrington & Alice L. Hartford) 186 Claremont av." The address is in West Harlem; "R. T. N." stands for Registered Trade Name.