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US Patent: 483,367
Cementing-machine
Patentee: William Robertson (exact or similar names) - Hamilton, ON Canada USPTO Classifications: 222/377, 239/331, 239/590.3, 401/151, 401/179, 425/458 Tool Categories: Assignees: Elbert D. Weyburn - Chicago, IL James A. McPherson - Hamilton, ON Canada Manufacturer: Not known to have been produced Witnesses: H. H. Bicknell Frederick Dunn	Patent Dates: Applied: Apr. 20, 1892 Granted: Sep. 27, 1892 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin
Description: Inventor Robertson was a "subject of the Queen of Great Britain".

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