Sound-copying technology and countermeasures, 1890-1978

Ed sez, "Here's an article from 1985 in the Association for Recorded Sound Collections Journal about record piracy in the 19th century. Includes illustrations of three duplicators from the 19th century."

Record Piracy: The Attempts of the Sound Recording Industry to Protect Itself against Unauthorized Copying, 1890-1978 (PDF)

(Thanks, Ed!)