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Working Model of a Horizontal Four-Stroke Ott...
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Heinrici-Type Hot-Air Engine, c. 1920...
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Märklin No. 16051 Steam Engine...
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Twin-Cylinder Hot-Air Engine Working Model...
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Working Model of a Single-Cylinder Walking Be...
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Hot-Air Engine, c. 1920...
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Twin-Cylinder Hot-Air Engine Working Model...
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Horizontal Single-Cylinder Lenoir Gas Engine ...