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US Patent: 2,558,938
Heat Pump and Control Means
Patentees: Earnest J. Dillman (exact or similar names) - Detroit, Wayne County, MI Thomas E. Noakes (exact or similar names) - Detroit, Wayne County, MI USPTO Classifications: 236/1R, 62/160, 62/509 Tool Categories: specialty machines : heating apparatus specialty machines : refrigeration apparatus Assignees: Detroit Lubricator Co. - Detroit, Wayne County, MI Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Dec. 30, 1948 Granted: Jul. 03, 1951 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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