OA00042A
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Improvement in machines with opposed free pistons.
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DE1451653A1
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Machine with free-flying opposed piston
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US3183900A
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Floating-piston internal-combustion machine
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GB944312A
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Improvements in a starting system for free-piston internal combustion engines
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GB969234A
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Improvements in or relating to devices for the compressed-air starting of internal combustion engines with free opposed pistons
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ES268060A1
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Improvements relating to internal-combustion operated free-piston gas generators
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US3106913A
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Combustion gas generator of the free-floating piston type
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CA709723A
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Motor-compressor system
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CA645127A
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Combustion gas generator of the free-floating piston type
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CA672362A
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Floating-piston, internal-combustion machine
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