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US Patent: 1,641,838
Pressure gauge
Patentee: Henry J. Burkhardt (exact or similar names) - Mount Ephraim, NJ USPTO Classifications: 73/709, 73/732 Tool Categories: gauges : vacuum and pressure gauges propulsion and energy : steam apparatus : stationary boilers : steam pressure gauges Assignees: J. E. Lonergan Co. - Philadelphia, PA Manufacturer: J. E. Lonergan Co. - Philadelphia, PA Witnesses: Unknown	Patent Dates: Applied: Nov. 21, 1921 Granted: Sep. 06, 1927 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for J. E. Lonergan Co.

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