Back in the 1920s, it seemed everything was becoming coin-operated. All over the U.S., you could find coin-operated weighing machines at railroad stations; coin-operated vending machines were chock ...
https://siris-libraries.si.edu/ipac20/ipac.jsp?&profile=liball&source=~!silibraries&uri=full=3100001~!667261~!0#focus ...
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