| Oerlikon Contraves a Swiss anti aircraft artillery company established in 1906. The first Oerlikon 20mm cannon is built since 1914.  |
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Used by | Login to Edit | |
| 1969 |  Support Ship Rover class | 2 | ||||
| 1972 |  Frigate Nilgiri class | 2 | ||||
| 1980 | Aircraft Carrier V STOL Invincible class | 2 | ||||
| 1987 |  Landing Ship/Platform Dock Normed class | 2 | ||||
| 1990 |  Support Ship Wu Yi class | 2 | ||||
| 1995 |  Support Ship Amsterdam class | 1 | ||||
| 1995 |  Support Ship Patiño class | 2 | ||||
| 1998 | Landing Ship/Platform Dock Galicia Class | 4 | ||||
In Service | Login to Edit | |
 Portuguese Navy | ||||||
| Royal Fleet Auxiliary | ||||||
 indonesian navy | ||||||
| Indian Navy | ||||||
| Royal Navy | ||||||
| Royal Thai Navy | ||||||
| Republic of China Navy (Taiwan) | ||||||
| Spanish Navy | ||||||
 Peruvian Navy | ||||||
| Royal Netherlands Navy | ||||||
