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US Patent: 1,327,902
Concentrator
Patentee: Henry Bolthoff (exact or similar names) - Denver, CO USPTO Classifications: 209/441 Tool Categories: specialty machines : ore processing apparatus Assignees: None Manufacturer: Hendrie & Bolthoff Manufacturing & Supply CO. - Denver, CO Witnesses: Unknown	Patent Dates: Applied: Mar. 18, 1918 Granted: Jan. 13, 1920 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Hendrie & Bolthoff Mfg. & Supply Co.

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