File:US591909A Argall rotary furnace transversal view patent.png
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![File:US591909A Argall rotary furnace transversal view patent.png](https://upload.wikimedia.org/wikipedia/commons/thumb/0/01/US591909A_Argall_rotary_furnace_transversal_view_patent.png/800px-US591909A_Argall_rotary_furnace_transversal_view_patent.png?20161213221837)
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