[Phono-L] 1881 Bell Tainter Disc

[Thomas Edison]

http://history.sandiego.edu/gen/recording/images/PDRM1554a.jpg
 
They label this as a lateral disc recording, but to me it looks vertical, just that the sound waves are near the top so they look lateral.  The date 1881, many years before the Berliner disc, has anyone played this disc?  Was this disc known about previous to the Berliner patent on disc records?  You would think that the patent office would have not accepted the Berliner patents if this was known about??
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