| http://www.w3.org/ns/prov#value | - Description of the Related Art [0002] In an internal combustion engine such as a diesel engine or the like, a diesel particulate filter (hereinafter referred to as a DPF) that collects particulate matter is arranged in an exhaust passage to remove particulate matter (hereinafter referred to as PM) from the exhaust gas discharged by the internal combustion engine.
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