File:Grant mechanical calculating machine 1877.jpg
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current | 21:46, 29 July 2013 | 1,401 × 897 (783 KB) | commons>Centpacrr | == Summary == {{Information | Description=Grant mechanical calculating machine (1877) George B. Grant Co., 94 Beverly St., Boston, MA | Source="Scientific American" Vol. XXXVI, No. 19, May 12, 1877 p.294 New York: Munn &Company (Publisher) "The Cooper... |
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