"Multi-Position Letter Sorting Machine" (MPLSM) - YouTube SmithsonianNPM

A short silent film showing the Multi-Position Letter Sorting Machine (MPLSM). MPLSM operators used 20-key keyboards to type in two or three numbers from the ZIP code, so the machine could then sort the mail into one of 277 or more bins representing sections of the country. These operators sorted mail at rates of 60 letters per minute. Visit the online exhibit: http://npm.si.edu/systemsatwork

"Multi-Position Letter Sorting Machine" (MPLSM) - YouTube
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Education	Upload TimePublished on 10 Nov 2011