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Patent:AT18131B 10.11.1904 Howieson, John Thomas (P) und Spiekermann, Frank (P) : Rechenmaschine [68.41%]
Patent:AT47330B 10.04.1911 Howieson, John Thomas (P) : Mit Schreibmaschinen beliebiger Type kuppelbare Rechenmaschine samt geeigneter Triebvorrichtung, Zehnerschaltung und Tastensperrung für Rechen- bezw. Schreibrechenmaschinen [62.49%]

Patent:CA84955 19.01.1904 Howieson, John Thomas (P) : Calculating machine [70.64%]

Patent:DE152639 31.08.1902 Howieson, John Thomas (P) und Spiekermann, Frank (P) : Addierwerk für Schreibmaschinen [67.70%]
Patent:DE258767 16.12.1909 Howieson, John Thomas (P) : Schreibrechenmaschine [70.64%]

Patent:GB190218853 28.05.1903 Howieson, John Thomas (P), Spiekerman, Frank (P) : Improvements in Calculating Machines [76.19%]
Patent:GB190930426 30.01.1911 Howieson, John Thomas (P) : Improvements in the Column Printing and Denomination Selecting Arrangements of Computing Attachments for Typewriters [64.99%]
Patent:GB191028058 30.01.1911 Howieson, John Thomas (P) : Improvements in the Reversing and Transfer Mechanism of Calculating and like Machines [72.72%]
Patent:GB191028362 30.01.1911 Howieson, John Thomas (P) : Improvements in and relating to the Differential Actuating Mechanism of Computing Attachments for Typewriters [65.65%]
Patent:GB191028363 30.01.1911 Howieson, John Thomas (P) : Improvements in and relating to Spring Motors for Driving Calculating and like Machines [66.41%]

Patent:US1030470 25.06.1912 Howieson, John T. : Calculating-machine [96.12%]
Patent:US712381 28.10.1902 Howieson, John T. : Calculating machine [96.12%]
Patent:US838996 18.12.1906 Howieson, John T. (P) American Arithmograph Comp. : Calculating machine [67.70%]
Patent:US946366 11.01.1910 Howieson, John T. : Calculating-machine [96.12%]

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