James D. Whelpley Improvement in Steam Engines - DPLA - 017ac72ddca56e502dbc7ca51ca3d3ed (page 5)

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James D. Whelpley Improvement in Steam Engines - DPLA - 017ac72ddca56e502dbc7ca51ca3d3ed (page 5)

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11/07/1871
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Public Domain

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