A Preventive Maintenance Model Subject to Sequential Inspection for a Three-Stage Failure Process
Xiaoxiao Caoa, Chao Guoa, Huasheng Xiongabc*(), Duo Lib, and Xiaojin Huangc

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Figure 1.. (a) Corrective replacement happens in $({{S}_{{{A}_{n}}+i}},{{S}_{{{A}_{n}}+i+1}})$; (b) Corrective replacement is taken in $({{S}_{{{A}_{n}}+i+1}},{{S}_{{{A}_{n}}+i+1}}+\tau )$