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In page Timeline of diving technology:
"
- The Communist Bloc fell apart and the Cold War ended (see Fall of Communism and dissolution of the Soviet Union), and with it the risk of future attack by Communist Bloc forces including by their combat divers. After that, the world's armed forces had less reason to requisition rebreather patents submitted by civilians, and sport diving automatic and semi-automatic mixture rebreathers start to appear.[citation needed]
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