US Patent 2,067,609
US Patent 2,067,609 of 1937-01-12, to Paul D. Kendall for "Ingot Feeder for Type Casting Machines."
(Production note: This PDF is assembled from PNG images of each patent page which were in turn converted from the TIFF images of the pages (300 dpi, I think) presented by the USPTO. It is therefore at the full available resolution; I don't have anything better.)
US patent documents are in the public domain. The PDF of the Kendall patent here is also in the public domain.
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