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US Patent: 3,621,998
Sheet grader
Patentee: Victor Prochaska (exact or similar names) - Unknown, Austria USPTO Classifications: 209/552, 209/643, 271/197 Tool Categories: trade specific : printer Assignees: Durand Machine Works Ltd. - New Westminster, BC Canada Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Feb. 27, 1970 Granted: Nov. 23, 1971 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Durand Machine Works

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