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US Patent: 2,809,515
Coolant Testing Instrument
Patentees: Larry A. Bard (exact or similar names) - Birmingham, Oakland County,, MI Donald E. Cardoze (exact or similar names) - Roseville, Macomb County, MI Lennart M. Hellstrom (exact or similar names) - Detroit, Wayne County, MI USPTO Classifications: 73/61.43, 73/61.59 Tool Categories: metalworking tools : machinist tools : coolant testing apparatus Assignees: Michigan Tool Co. - Detroit, Wayne County, MI Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Oct. 20, 1954 Granted: Oct. 15, 1957 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Michigan Tool Co.

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