On August 8, 1876 Thomas Edison received US patent 180,857 for "Improvement in Autographic Printing" (Link to USPTO Patent Database Page or PDF of full patent). This technology later became widely known as the mimeograph after AB Dick Company licensed the technology from Edison as noted in this page in Edison's journal notes the agreement in 1887.

AB Dick marketed that product as the Edison Mimeograph. They sold the machine, ink and paper much like digital print suppliers do today. This marketing brochure from 1889 provides all the details for the system that was already in use by over twenty thousand users.

Today marks a milestone in the development of mechanical duplicating. Share your stories of using the mimeograph in the comments.