I learned this from a former salesman of the Operators Piano Company:

    Reproduco = ree pro DEW koe  and not ree pro DOO koe

He was specific about this.

Having lived in Chicago in the 'forties I had the fortune of knowing
several people who'd been connected with Mills Novelty Co., Clark,
Seeburg, as well as The Operator's Piano Co. and some others.

This particular fellow was selling an automatic typewriting machine that
ran on perforated rolls when I met him.  It was called an Auto-Typist.

I was operating a Mills Novelty Co. ice cream machine at the time so
I had some contact with some of the personnel there, too.  On one trip
over there I saw an interesting picture that one of the workers had.
It showed all of the Mills Roll perforators lined up to be taken for
the World War II scrap drive where they presumably were melted down for
the war effort.

That, by the way, is the same fate that befell the Wurlitzer quad valve
dies that were at the Sterling Foundry Company in New York, actually
Brooklyn, about the same time.  This information was supplied to me by
a woman who worked there at the time and was still there when I called
them, about 25 or 30 years ago.  She was even kind enough to ask one of
the men that still worked there from that time, to check and see if
there was any possibility of even one of them remaining but on a
subsequent call she informed me that every single one of them had been
gone for a long time.

For what it's worth

Hal Davis