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20x139 Ammunition
The 20×139 ammunition family was developed in Switzerland by Hispano-Suiza in the late 1940s for their HS 820 20 mm automatic cannon, later known by its Oerlikon designation of KAD. Later Swiss (Oerlikon) ammunition, which used the same projectiles as their 20×128 ammunition range, included: armour-piercing hard core tracer (AP-T); high explosive incendiary (HEI); high explosive incendiary tracer (HEI-T); semi-armour-piercing high explosive in...
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