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US Patent: 3,941,040
Fume hood
Patentee: Arthur W. Carlson (exact or similar names) - Muskegon, MI USPTO Classifications: 108/150, 454/56, 55/DIG.018 Tool Categories: Assignees: E. H. Sheldon & Co. - Muskegon, MI Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Feb. 12, 1975 Granted: Mar. 02, 1976 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for E. H. Sheldon & Co.

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