Click Here to Continue Viewing Current Query Results or Home to Start a New Query. Description: Syncro Electric Hone Sharpener - Model 400 - 110-120 Volts AC Manufacturer: Syncro Saw Corporation, 520 Woodward Av., Rochester, MI Type: Electric Country: USA Patent: US - 2092187(9/7/1937) Comment: Also, it came in white. Invoice dated 12/31/1949. Patent applies to an electric razor sharpener. Source: twillard Editors: