In August 2016, patent certificate of the folding central coupler awarded to Haiduo by the State Intellectual Property Office of People's Republic of China.
Patent No.: ZL 201620261182.2, Period of validity: 10 years.
Haiduo is also applying for patents for other products that are currently under development. Our widely used patented products has won the appreciation of both oversea and domestic customers in the railway market.
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