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US Patent: 3,332,317
Chalk screen image projector
Patentees: Eugene F. Peckman (exact or similar names) - Pittsburgh, PA Arthur W. Carlson (exact or similar names) - Muskegon, MI Frank R. Torrey (exact or similar names) - Silver Spring, MD USPTO Classifications: 353/44, 353/98, 434/408 Tool Categories: Assignees: E. H. Sheldon & Co. - Muskegon, MI Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: May 19, 1965 Granted: Jul. 25, 1967 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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