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US Patent: 3,547,505
Biological service center
Patentees: Arthur W. Carlson (exact or similar names) - Muskegon, MI Donald E. Ott (exact or similar names) - Muskegon, MI USPTO Classifications: 312/1, 312/209 Tool Categories: Assignees: E. H. Sheldon & Co. - Muskegon, MI Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jul. 09, 1969 Granted: Dec. 15, 1970 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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