A novel logging system employing M (N+1! redundancy is disclosed having applications in recording both voice and facsimile transactions. The logging system includes M chains of N+1 loggers. Each N+1 chain includes N working loggers and a single spare logger. Within each chain, each working logger is...http://www.google.com.au/patents/US5937029?utm_source=gb-gplus-sharePatent US5937029 - Data logging system employing M N +1! redundancy
