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Priority claimed from US447088Aexternal-prioritypatent/US3901449A/en
Application filed by Hudson Mfg Co H DfiledCriticalHudson Mfg Co H D
Publication of ATA152375ApublicationCriticalpatent/ATA152375A/de
Application grantedgrantedCritical
Publication of AT341820BpublicationCriticalpatent/AT341820B/de