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  • Patent:GB374109 06.06.1932 Hart, Frederick (P) Remington (P) Rand Inc : Improvements in combined typewriting and computing machines
  • Patent:US1176364 21.03.1916 Hart, Frederick (P) Underwood (P) Computing Machine Comp. : Combined type-writing and computing machine
  • Patent:US1188933 27.06.1916 Hart, Frederick (P) Underwood (P) Computing Machine Comp. : Combined type writing and computing machine
  • Patent:US1189689 04.04.1916 Hart, Frederick (P) Underwood (P) Computing Machine Comp. : Combined type-writing and computing machine
  • Patent:US1190171 04.07.1916 Hart, Frederick (P) Underwood (P) Computing Machine Comp. : Combined type-writing and computing machine
  • Patent:US1190233 04.07.1916 Hart, Frederick (P) Underwood (P) Computing Machine Comp. : Combined type writing and computing machine
  • Patent:US1211148 02.01.1917 Hart, Frederick (P) Underwood (P) Computing Machine Comp. : Combined type writing and adding machine
  • Patent:US1213100 16.01.1917 Hart, Frederick (P) Underwood (P) Computing Machine Comp. : Combined type-writing and computing machine
  • Patent:US1231523 26.06.1917 Hart, Frederick (P) Underwood (P) Computing Machine Comp. : Combined type writing and computing machine
  • Patent:US1237513 21.08.1917 Hart, Frederick (P) Underwood (P) Computing Machine Comp. : Combined type-writing and computing machine
  • Patent:US1237899 21.08.1917 Hart, Frederick (P) Underwood (P) Computing Machine Comp. : Combined typewriting and computing machine
  • Patent:US1237900 21.08.1917 Hart, Frederick (P) Underwood (P) Computing Machine Comp. : Combined typewriting and computing machine
  • Patent:US1254627 22.01.1918 Hart, Frederick (P) Underwood (P) Computing Machine Comp. : Combined type writing-and computing machine
  • Patent:US1270411 25.06.1918 Hart, Frederick (P) Underwood (P) Computing Machine Comp. : Combined typewriting and computing machine
  • Patent:US1281362 15.10.1918 Hart, Frederick (P) Underwood (P) Computing Machine Comp. : Combined type writing and computing machine
  • Patent:US1281953 15.10.1918 Hart, Frederick (P) Underwood (P) Computing Machine Comp. : Combined type writing and computing machine
  • Patent:US1282823 29.10.1918 Hart, Frederick (P) Underwood (P) Computing Machine Comp. : Combined type writing and computing machine
  • Patent:US1285150 19.11.1918 Hart, Frederick (P) Underwood (P) Computing Machine Comp. : Combined type writing and computing machine
  • Patent:US1287301 10.12.1918 Hart, Frederick (P) Underwood (P) Computing Machine Comp. : Combined type-writing and computing machine
  • Patent:US1296953 11.03.1919 Hart, Frederick (P) Underwood (P) Computing Machine Comp. : Combined type writing and computing machine
  • Patent:US1325469 16.12.1919 Hart, Frederick (P) Underwood (P) Computing Machine Comp. : Combined type-writing and computing machine
  • Patent:US1339704 11.05.1920 Hart, Frederick (P) Underwood (P) Computing Machine Comp. : Combined typewriting and computing machine
  • Patent:US1382286 21.06.1921 Hart, Frederick (P) Underwood (P) Computing Machine Comp. : Combined typewriting and computing machine
  • Patent:US1388257 23.08.1921 Hart, Frederick (P) Underwood (P) Computing Machine Comp. : Combined typewriting and computing machine
  • Patent:US1414639 02.05.1922 Hart, Frederick (P) Remington (P) Accounting Machine Comp. : Calculating machine
  • Patent:US1464095 07.08.1923 Hart, Frederick (P) Remington (P) Accounting Machine Comp. : Calculating machine
  • Patent:US1517424 02.12.1924 Hart, Frederick (P) Remington (P) Accounting Machine Comp. : Computing machine
  • Patent:US1583290 04.05.1926 Hart, Frederick (P) Remington (P) Accounting Machine Comp. : Calculating machine
  • Patent:US1693753 04.12.1928 Hart, Frederick (P) Remington (P) Accounting Machine Comp. : Computing machine
  • Patent:US1737586 03.12.1929 Hart, Frederick (P) Remington (P) Accounting Machine Comp. : Combined typewriting and computing machine
  • Patent:US1767792 24.06.1930 Hart, Frederick (P) Remington (P) Accounting Machine Comp. : Combined typewriting and computing machine
  • Patent:US1973313 11.09.1934 Hart, Frederick (P) Remington (P) Typewriter Comp. : Computing machine
  • Patent:US2063737 08.12.1936 Hart, Frederick (P) Remington (P) Typewriter Comp. : Combined typewriting and computing machine
  • Patent:US2083994 15.06.1937 Hart, Frederick (P) Remington (P) Rand Inc : Accounting machine

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