Quixsum Adding Machine 1924
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The Quixsum Fractional Adding Machine is an elegant dial adder convenient for adding fractional sums of feet and inches.
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Quixsum Fractional Adding Machine 1924
Precision Adding Machine Co. Inc.
Providence, RI Charlotte, NC
(source ebay)
Patent Drawing Quixsum Fractional Adding Machine 1923
JOSEPH F. LEITNER
(source Google Patent Search)
Quixsum Fractional Adding Machine 1924
(source ebay)