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Unknown Piano Roll Perforator Is Auto-Typist
By Don Teach 

The unknown perforator is an Auto Typist machine for making form
letters.  Someone tried to make a piano roll perforator from it,
apparently.

Don Teach

(Message sent Sat, 26 Oct 2019 00:01:58 -0700 (PDT) , from time zone -0700.)

Key Words in Subject:  Auto-Typist, Is, Perforator, Piano, Roll, Unknown