Clark Heater Number 7-D by the Chicago Flexible Shaft Company. Metal wedge-shaped case covered in green wool carpet. Drawer on right side for holding coal. Vents on left side and back. Foot warmer was used by Dr. Otto Clarence Fritts (1876-1967) when he worked as a "horse and buggy doctor." Fritts began practicing medicine in 1897, originally in his native Missouri. In 1922 he relocated to Osage City, Kansas, where he continued to practice until his death in 1967. He used the foot warmer for many years while making housecalls during cold weather, both in his buggy and later in his car. Founded in the early 1890s as a manufacturer of livestock clippers and shearers, the Chicago Flexible Steel Company began making small appliances including heaters in about 1908. In 1946 it was reorganized as Sunbeam.