2) Sholes, C. L.; Glidden, C.; Soulé, S. W. Improvement in Type-Writing Machines. United States Patent. No.79868, 1868.
3) Sholes, C. L.; Schwalbach, M. Improvement in Type-Writing Machines. United States Patent. No.182511, 1876.
8) Sholes, C. L. Improvement in Type-Writing Machines. United States Patent. No.207559, 1878.
15) Dickerson, R. E. Did Sholes and Densmore Know What They Were Doing When They Designed Their Keyboard? ETCetera. No.6, 1989, p.6-9.
3) Sholes, C. L.; Schwalbach, M. Improvement in Type-Writing Machines. United States Patent. No.182511, 1876.
8) Sholes, C. L. Improvement in Type-Writing Machines. United States Patent. No.207559, 1878.
15) Dickerson, R. E. Did Sholes and Densmore Know What They Were Doing When They Designed Their Keyboard? ETCetera. No.6, 1989, p.6-9.
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