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US Patent: 2,187,038
Method of and Apparatus for Cold Control
Patentee: Irving J. Knudson (exact or similar names) - Kenilworth, Cook County, IL USPTO Classifications: 137/505.44, 62/115, 62/223 Tool Categories: specialty machines : refrigeration apparatus Assignees: Detroit Lubricator Co. - Detroit, Wayne County, MI Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: May 14, 1935 Granted: Jan. 16, 1940 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Detroit Lubricator Co.

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