American portable typewheel machines, ink-roller, downstroke, 28 keys in three rows, two shift-keys, 84 characters, invented by George C. Blickensderfer (1850–1917) in 1891 and manufactured by the Blickensderfer Typewriter Co., Stamford, Connecticut, USA. 1) "Blickensderfer No. 8", 1909 onwards, American typewheel machine, decimal tabulator and a backspace key, carriage movement stiff, with original oak case. – Literature: Martin, 1949, p. 136. (2–3/3) – And: 2) "Blickensderfer No. 5", 1894, serial no. 69024, DHIATENSOR keyboard, with original oak case. (2–3/2–3)品相: (–/–)