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US Patent: 476,512
Device for testing pressure-gauges
Patentee: Charles Bartlett Bosworth (exact or similar names) - Everett, MA USPTO Classifications: 73/1.68, 73/1.69 Tool Categories: propulsion and energy : steam apparatus : stationary boilers : steam pressure gauges Assignees: Crosby Steam Gage & Valve Co. - Boston, MA Manufacturer: Crosby Steam Gage & Valve Co. - Boston, MA Witnesses: Dudley P. Bailey J. H. Millett	Patent Dates: Applied: Feb. 17, 1892 Granted: Jun. 07, 1892 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Crosby Steam Gage & Valve Co.

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