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Today, maintenance strategies and their analyses remain a worrying problem for companies. Socio economic stakes depending on competitiveness of each strategy are even more linked to activity and quality of maintenance interventions. A series of specific events can eventually warn the expert of an imminent breakdown. Our study aims at understanding such "signature" thanks to hidden Markov models. On that purpose, two methods for damage level estimation of maintained system are proposed todoi:10.1177/1748006x11406335 fatcat:snkctsm2szhrbgwy2e2wc2vkyy