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International Business Machines Corp
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International Business Machines Corp
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Priority claimed from US00418696Aexternal-prioritypatent/US3852723A/en
Application filed by International Business Machines CorpfiledCriticalInternational Business Machines Corp
Publication of ES431922A1publicationCriticalpatent/ES431922A1/es
Supervisory arrangement for detecting faults in means for selecting crossing points corresponding to switching means ina reading matrix ina telecommunication system controlled by computers