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Priority claimed from US06/037,418external-prioritypatent/US4233176A/en
Application filed by Alvin J. Conner Sr.filedCriticalAlvin J. Conner Sr.
Priority claimed from EP19800301531external-prioritypatent/EP0020042B1/de
Application grantedgrantedCritical
Publication of ATE6795T1publicationCriticalpatent/ATE6795T1/de