AnthraFlo located in Trucksville, PA
Below were some manufacturers of commercial and industrial anthracite stokers and boilers.
E. Keeler Co., Williamsport
Riley Stoker, Worcester, MA
International Boiler Works, East Stroudsburg, PA
All of the above are out of business, however former employees of E. Keeler Co. founded a company in Lock Haven, PA called "Faber Burner Co." I understand that they still make spare parts for Keeler installations and have the blue prints for Keeler stokers and accessories.
Detroit Stoker, Monroe, MI is still in business but they now specialize in waste to energy systems.