the bars being rocked about axes transverse to their lengths

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    • Patent number 2,278,317
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    • F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES
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    1456707

    • Patent number 1,456,707
    • Issue date May 29, 1923
    • F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES
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    2250

    • Patent number 2,250
    • Issue date Sep 11, 1841
    • F24 - HEATING RANGES VENTILATING

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