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US Patent: 768,473
Recording Pen
Patentee: Coleman J. Manning (exact or similar names) - Medford, Middlesex County, MA USPTO Classifications: 346/140.1 Tool Categories: industrial machines : industrial recording apparatus Assignees: American Steam Gauge & Valve Co. - Boston, Suffolk County, MA Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Feb. 01, 1904 Granted: Aug. 23, 1904 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for American Steam Gauge Co.

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