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FR2506619A1
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Swim fin with zones for propulsion - has half truncated cones with wide base at front to trap water
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FR2480129A1
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Swimming fin with variable inclination - has reinforcing ribs extended under foot and pivoting around point under arch
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FR2455905A1
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Variable curve swimming flipper - has axial rib to limit curvature with v-shaped notches along its length
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US4300255A
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Foot flipper device
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FR2410488A1
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Swimming flipper with increased propulsion effect - has foot cavity extended by ducts, and flipper panel attached to upper surface
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FR2387406A1
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Pressure release valve for submerged breathing equipment - has diaphragm operating slide valve which connects with system
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FR2387055A1
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Flipper for underwater swimming - has trapezoidal cross=section reinforced rib which connects foot portion to flat, flexible, propulsive area
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FR2355529A1
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Flipper for underwater swimming - has side ribs and central channel to stabilise and guide water expelled by flexible flap valves
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US3525321A
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Catapult cord attachment device on a projector
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