Oerlikon Contraves a Swiss anti aircraft artillery company established in 1906.
The first Oerlikon 20mm cannon is built since 1914.
The first Oerlikon 20mm cannon is built since 1914.
Specifications |
| 0.48 | weight (tn) |
| 1 | crew |
| 20 | caliber (mm) |
| 300 | Rate of fire (round/min) |
| 2 | range (km) |
Used by |
| 1969 |  Rover class support ship AO | 2 |
| 1972 |  Nilgiri class frigate FF | 2 |
| 1980 | Invincible class aircraft carrier v stol CVS | 2 |
| 1987 |  Normed class landing ship/platform dock L | 2 |
| 1990 |  Wu Yi class support ship AO | 2 |
| 1995 |  Amsterdam class support ship AO | 1 |
| 1995 |  Patiño class support ship AO | 2 |
| 1998 | Galicia Class landing ship/platform dock L | 4 |
In Service |
| Royal Fleet Auxiliary |
 Indonesian Navy |
 Portuguese Navy |
| Indian Navy |
| Royal Navy |
| Royal Thai Navy |
| Republic of China Navy (Taiwan) |
| Royal Netherlands Navy |
| Spanish Navy |
 Peruvian Navy |
