Babbage Calculator, 1864
Granger
Modern Chinese Abacus
Granger
ABACUS, 19th CENTURY
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Lewis Expedition Summary
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Census Machine, 1890 #1
Granger
Hollerith Tabulator, 1890
Granger
ANEMOMETER, 20th CENTURY
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Aneroid Barometer, 1895
Granger
BALANCE, 20th CENTURY #1
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BALANCE, 20th CENTURY #3
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Measuring & Marking Stone #1
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Census Counting Machine
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Census Tabulator, C1908 #4
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Farmer's Almanac, 1793 #2
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Cartoon Science, 1920
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Census Machine, 1890
Granger
Abacus, 19th Century #1
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Vannevar Bush (1890-1974)
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Cotton Picker, 1935 #5
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BALANCE, 20th CENTURY #2
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Measuring & Marking Stone
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BALANCE, 20th CENTURY #4
Granger
Census Tabulator, C1908 #2
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English Tax Cartoon, 1843
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Egypt Stone Weights
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Pompeii Bone Counters
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Census Machine, 1890 #2
Granger
Egypt Balance, C2000 B
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Census Machine, 1890 #3
Granger
Census Machine, 1890 #4
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Cotton Checker, 1935
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Texas Cotton, 1936 #1
Granger
BALANCE, 20th CENTURY
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Joseph Louis Lagrange (1736-1813) #1
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