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US Patent: 1,129,988
Sight Glass
Patentee: Edgar A. Kelsey (exact or similar names) - Mount Vernon, Westchester County, NY USPTO Classifications: 184/96, 220/663, 73/331 Tool Categories: industrial tools : tool lubricators : lubricating accessories Assignees: Nathan Mfg. Co. - New York, NY Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Apr. 21, 1914 Granted: Mar. 02, 1915 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Nathan Mfg. Co.

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