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US Patent: 1,721,249
Gyratory fan
Patentee: Frederick Diehl (exact or similar names) - Elizabeth, NJ USPTO Classifications: 416/110, 74/86 Tool Categories: Assignees: Diehl Mfg. Co. - Elizabeth, NJ Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Apr. 27, 1928 Granted: Jul. 16, 1929 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Diehl Mfg. Co.
Description: Improvement to patent 1,099,693.

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