by Dr. Lori Verderame Since coffee is an age-old hot drink, coffee grinders date back to the 9th Century AD. As coffee served many people from diverse cultures worldwide, grinding coffee beans was essential. Today, the machines for grinding coffee beans are highly collectible. In Europe, the coffee grinder was patented by a German inventor named Friedrich Gottlob Keller in 1842. Based on this German coffee grinder, other coffee grinders followed suit. American coffee grinders were […]
