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  1. 1
    by Lehrburger, Egon
    Published 1975
    Book

    Kasaysayan ng imbensiyon
  2. 2
    by Morison, Elting Elmore
    Published 1966
    Book

    Men, machines, and modern times
  3. 3
    by Schmookler, Jacob
    Published 1966
    Book

    Invention and economic growth.
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