From Wikipedia:

In 1872, Samuel A. Weller founded Weller Pottery in Fultonham, Ohio, United States. Originally, his business consisted of a small cabin and one beehive kiln, and Weller produced flower pots, bowls, crocks, and vases.[1] By 1905, Weller Pottery was the largest pottery in the country. It mass-produced art pottery until about 1920, and it produced commercial lines until the pottery closed in 1948.