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近日,由洛阳拖拉机研究所研制的“发动机四腔排气消声器”、“发动机阻抗复合型排气消声器”被国家知识产权局授予实用新型专利权。 据介绍,发动机四腔排气消声
Recently, the Luoyang Tractor Institute developed “engine four chamber exhaust muffler”, “engine impedance composite exhaust muffler” by the State Intellectual Property Office granted utility model patents. According to reports, the four-chamber exhaust muffler