The Pervenko Typewriter was an index writing machine for the blind. It was most likely invented in Russia during the 2nd half of the 19th century.

 

(Печатающая машина Первенко для слепых)

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Have some info about this typewriter? Have you found it? If yes, please email me at Antikey.Chop@gmail.com or call +1 (860) 729-2252

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