You might want to call Joe Hickerson at the Archive of Folk Culture at the Library of Congress (202 707-5510). I'm sure they're on line, too, but I don't know the address. The machine you are talking about sounds like one of the type that folklorists used in the field to record songs and stories before tape recorders. Because the Archive has a lot of discs recorded on machines like this in their collection, they are familiar with the machines that made them. At the library you might also want to contact the Recorded Sound Section (202 707-7833)--they know about these materials as well. Good luck. Kathy Condon