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History
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Full foot fins
Full foot fins
By 1974, modern-looking swimfins in regular use in landlocked, "second-world" Hungary.
By 1974, modern-looking swimfins in regular use in landlocked, "second-world" Hungary.
1959 Soviet postage stamp with image of finned recreational diver in tribute to the DOSAAF sport organisation.
1959 Soviet postage stamp with image of finned recreational diver in tribute to the DOSAAF sport organisation.
Swim fin sole showing compliance with German standard DIN 7876:1980
Swim fin sole showing compliance with German standard DIN 7876:1980
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Fish get thrust moving vertical tail fins from side to side.
Fish get thrust moving vertical tail fins from side to side.
Cetaceans get thrust moving horizontal tail fins up and down.
Cetaceans get thrust moving horizontal tail fins up and down.
Stingrays get thrust from large pectoral fins.
Stingrays get thrust from large pectoral fins.
Ship propeller
Ship propeller