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US Patent 1,826,780 E. L. HARMON TYPEWRITING MACHINE figs. 4-11
US Patent 1,826,780 E. L. HARMON TYPEWRITING MACHINE figs. 4-11
Attribution:
Typewriting Machine. https://patents.google.com/patent/US1826780A/en. Accessed 3 May 2021.
Date:
1931