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Valve with ball-shaped stop cock
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Plug valve
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Seal for sealing areas of different pressures with regard to each other
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Free piston compressor system with double acting compressor piston
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Air-cushioned free piston type compressor
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Rotary piston engine
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Rotary piston compressor
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Rotary lobe compressor with eccentrically arranged rotary lobes
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Improvements in or relating to cocks with spherical plugs
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