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Monroe #1 High Speed Adding Calculator

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Posted 7 years ago


(1 item)

I have an electric Monroe #1 High Speed Adding Calculator that still works when plugged in. The sticker on the bottom says Calculating Machine Company New York, USA, #1, 100-135 volts -0-60 cycle, 100-135 volts D. C.

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  1. Sara, 6 years ago
    I have a similar Monroe calculator. Interestingly it is not exactly the same, but the label is identical. My dad used it for years following WWII. I put a photo here:
    I found some info on a website here:
    I would love to learn how to operate it!

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