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  1. 'THE ENGINEER'S SLIDE RULE" from E.M. SCOFIELD

    'THE ENGINEER'S SLIDE RULE" from E.M. SCOFIELD

    $750.00

    American, patent dated July 2, 1901 Learn More
  2. GEM ADDING MACHINE (5 PLACE) by AUTOMATIC ADDING MACHINE MFRS.
  3. STANLEY-BOUCHER CALCULATOR BY W.F. STANLEY

    STANLEY-BOUCHER CALCULATOR BY W.F. STANLEY

    $1,250.00

    English, 1st quarter 20th century Learn More
  4. Petersen, C. - COLLECTION OF ORIGINAL U.S. PATENT MODELS FOR INVENTIONS FROM 1790-1898, Volumes 1-8
  5. Evans, J.R. - PATENTING MINING CLAIMS AND MILL SITES IN CALIFORNIA

    Evans, J.R. - PATENTING MINING CLAIMS AND MILL SITES IN CALIFORNIA

    $15.00

    Sacramento: Bureau of Land Management, 1990 Learn More

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