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 3.. (a) Inspection replacement happens at ${{S}_{{{A}_{n}}+i+1}}$; (b) Inspection replacement istaken at ${{S}_{{{A}_{n}}+m+1}}$