Defang Yuan

4 Patents

• US117135982023

  Handcuff with Automatic Over-tightening-prevention Mechanism

  0 cites
• US116133472023

  Low Cost, High Reliable, Double Engined VTOL

  0 cites
• US116107522023

  Fast Smart Circuit Breaker

  0 cites
• US115728262023

  Engine and Ignition Assembly with Two Pistons

  0 cites