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Google Patents Method for using void pantographsĭownload PDF Info Publication number US8743425B2 US8743425B2 US13/148,810 US200913148810A US8743425B2 US 8743425 B2 US8743425 B2 US 8743425B2 US 200913148810 A US200913148810 A US 200913148810A US 8743425 B2 US8743425 B2 US 8743425B2 Authority US United States Prior art keywords pantograph void pantographs foreground background Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US8743425B2 - Method for using void pantographs

US8743425B2 - Method for using void pantographs