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Mechanical Calculators Manufacturer Database
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Brand
|
Manufacturer |
Origin |
First |
Last |
Type |
Info |
|
| O | |||||||
 | O.K.E | ARG | - | - | S | - | |
| OAO Kalibr | RUS | - | - | S |  | |
| Oerlikon-Bührle & Co. | SWI | 1906 | act. | E | - | |
| Ohico | HOL | 1930s | - | S |  | |
| Ohmoto Tekko (->Tiger ) | JAP | <1923 | - | M | | |
| Oliver Co. | AUT | - | - | M | - | |
| Olivetti Industria | ARG | - | - | M | - | |
 | Olivetti Underwood | Olivetti | USA | 1950s | - | M | - |
 | Olpimatic | GER | 1950s | - | M | - | |
| Olson | Relay/Ricoh | USA | - | - | S | |
| Olympe | ? | 1958 | - | M | | |
| Olympi | Olympia-Werke AG | GER | 1948 | - | M, E | |
| Omaro | FRA | 1928 | - | S | | |
| Omega | Wescosa | USA | - | - | A | - |
| Omega | Relay/Ricoh | USA | - | - | S | |
| Optima | Dr. Albert Hauff | GER | 1910 | - | S | |
| Optische Antstalt C.P. Goerz AG | GER | 1921 | - | A | - | |
| Optischen Maschinenbaum-Industrie AG (OMIAG) | GER | 1924 | - | M, S | - | |
| Orga AG | GER | 1920 | - | M | | |
| Orga-Constant | Maschinenbau Koch | GER | 1921 | - | M | - |
| Oriette | ? | 1957 | 1959 | M | - | |
| Orions | ? | - | - | S | | |
| Orlin | ? | 1892 | - | M | - | |
| Oslo University | NOR | 1938 | 1942 | D | | |
| Otis King | Carbic, Ltd. | UK | <1940 | >1950 | S | |
 | Ott, Albert | GER | 1938 | - | D | - | |
| Ott, Max | GER | - | - | ? | - | |
| Otto Holzapfel und Cie. | GER | 1914 | 1953 | M | | |
| Otto Meuter & Sohn | GER | 1928 | 1973 | A | | |
| Oxner Rechnemaschinen-Fabrik | SWI | 1951 | 1954 | M | - | |
| Ozone | ? | - | - | S | - | |
(c) epocalc 2012