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enginners/students slide rule-possibly 1940s or 50s?

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Office Antiques1256 of 1931PAIR OF LETTER OPENERS ?5 cent 10 cent postage stamp dispenser
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    Posted 11 years ago

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    michaeln544
    (351 items)

    bought down birminghams old bull ring markets in 1980s for 50 pence, no idea how you use it. electronic calculators replaced it in the 1970s i believe.

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