Trapezoidal Trapezoidal Tucet Traput Patent Patent Patent Pather Pather-2019

May 19-keedii , 2010, Viga trapezoid saqafka saran ee loo yaqaan 'naqshadeeya naqshadeeya naqshadeeye Peter Kuang, wuxuu helay shahaadada paytent-ka naqshadeynta leh ee Xafiiska Guryaha Chranta ee P.R.C. Shahaadada Maya. Ref.:1220930 taas oo leh ilaa laga helo ilaa May 18-keeda 2020.