To be fair, cylinder dictation machines continued to be manufactured by
McGraw-Edison (and by Dictaphone) right up through the 1940s. I would
imagine that blanks continued to be available for some time after that,
although by the 1950s both concerns were making flexible plastic "belt"
records and machines, and then magnetic tape.
On Wed, Feb 10, 2016 at 12:55 PM, Tom Fine <[log in to unmask]>
> The Edison cylinder dictation machines were still being used in the 60s
> and 70s by some local and state government agencies. I know of a machine
> that was finally retired from service in a Maryland government agency in
> the 1980s.
> -- Tom Fine