Between 1860 and 1875 several patents were granted for mechanisms indicating the day of the week, the day of the month and the month of the year on a seperate dial below the time dial in the same case as the clock mechanism. The earliest patent was issued to Hawes of Ithaca, New York, on the 17th of May 1853, but it did not compensate for leap-year, although adjusting for the varying lengths of the months. Atkins & Burritt of Ithaca, New York, were granted a patent September 19th, 1854 for the first true perpetual-calendar mechanism. The mechanism was improved by the Mix Brothers, and purchased by the Seth Thomas Clock Company in 1864.