Coffee in my great grandfather's dream

I have the privilege of possessing one of my great grandfather's handwritten dreams. The dream was written in pencil on small pieces of lined paper. I made copies of the 4 page dream because the paper is yellowing and crumbling. From the ending of the dream, I gathered that the dream was a spiritual one. In the middle of the dream, my great grandfather ran across a coffee mill and took some coffee. Some of the coffee was grounded and some was whole. Coffee mills were invented in the early 19th century.I suspect that my great grandfather wrote this dream in 1925. Here's some pics of antique coffee grinders/mills. I always thought that a coffee mill was an actual place where coffee was processed ?