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US Patent: 1,850,690
Retaining device for plate valves
Patentee: Snowden B. Redfield (exact or similar names) - Easton, PA USPTO Classifications: 137/454.4, 137/601.13, 251/61.2, 417/446, 417/454, 92/94 Tool Categories: industrial machines : pneumatic : air compressors Assignees: Ingersoll-Rand Co. - Jersey City, NJ Manufacturer: Ingersoll-Rand Co. - Jersey City, NJ Witnesses: Unknown	Patent Dates: Applied: Dec. 01, 1928 Granted: Mar. 22, 1932 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Ingersoll-Rand Co.

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