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US Patent: 897,311
Pressure Recorder
Patentee: George Spencer (exact or similar names) - Medford, Middlesex County, MA USPTO Classifications: 346/113, 73/712, 73/732 Tool Categories: industrial tools : pressure indicators industrial machines : industrial recording apparatus Assignees: Crosby Steam Gage & Valve Co. - Boston, Suffolk County, MA Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Mar. 13, 1908 Granted: Sep. 01, 1908 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Crosby Steam Gage & Valve Co.

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