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PL357965A1
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Salvage ship designed for clearing effects of oil-tanker disasters
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PL357748A1
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Device collecting petroleum from water
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PL354736A1
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Combustion engine for continuous operation
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PL353596A1
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Artificial heart with combined ventricles
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PL351018A1
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Artificial hearth with multiple-function valvules
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PL325931A1
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Axle-mounted engine
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PL313007A1
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Pulsatory internal combustion engine and backward compressor
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PL307005A3
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Water level stabiliser and cradle-type pump
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PL306183A1
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Rocking compressor
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PL305573A1
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Aircraft ball engine
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PL296542A1
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Hydrostatic motor
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PL290562A2
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Aeropulse ship's engine
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PL236377A1
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Vane-type air turbine
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