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Priority claimed from US191833Aexternal-prioritypatent/US3241937A/en
Priority claimed from US251682Aexternal-prioritypatent/US3241939A/en
Priority claimed from US251545Aexternal-prioritypatent/US3241938A/en
Priority claimed from US251848Aexternal-prioritypatent/US3345149A/en
Application filed by Pittsburgh Plate Glass CofiledCriticalPittsburgh Plate Glass Co
Application grantedgrantedCritical
Publication of DK107118CpublicationCriticalpatent/DK107118C/da