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US Patent: 1,404,770
Air Brake Recording Apparatus
Patentee: Frank H. Hopkins (exact or similar names) - Somerville, Middlesex County, MA USPTO Classifications: 346/50, 346/62, 73/39, 73/712 Tool Categories: industrial machines : industrial recording apparatus Assignees: American Steam Gauge & Valve Mfg. Co. - Boston, Suffolk County, MA Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Oct. 26, 1916 Granted: Jan. 31, 1922 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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