Roasting process of coffee. Coffee beans moved by the rotating shovel inside the hopper for cooling down and screening after roasting. Drum type roast Stock Photo - Alamy
Amazon.com: ICZW Electric Coffee Bean Roaster Gas Coffee Bean Baker Drum Type Stainless Steel for Home and Commercial Use 14.5L: Home & Kitchen
Rotary Drum Mixer - Scott Equipment Company
My 15-Year Quest to Make the Ultimate DIY Coffee Roaster - Make: