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Addiator Patent Duplex Manual Calculator

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Calculators13 of 63Vintage Burroughs Adding Machine.We have no idea what this is, help!
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    Posted 5 years ago

    KeithT
    (1 item)

    Addiator Patent Duplex. Black and silver both sides in cardboard flip wallet.
    Telescopic riser on hinge (see picture). No idea of value or year. Inherited from my father who was a draughtsman.

    Unsolved Mystery

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