File:Plan of Cochran Patent Vertical Multitubular Boiler for Risoy, 1919.pdf
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![File:Plan of Cochran Patent Vertical Multitubular Boiler for Risoy, 1919.pdf](https://upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Plan_of_Cochran_Patent_Vertical_Multitubular_Boiler_for_Risoy%2C_1919.pdf/page1-800px-Plan_of_Cochran_Patent_Vertical_Multitubular_Boiler_for_Risoy%2C_1919.pdf.jpg?20210615100148)
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