Patents/Inventors

Hongjia Wang

ShanghaiCN3 patents

4 Patents

US122691012025
Twist Drill
0 cites
US120538312024
Step Drill Bit and Method for Drilling a Workpiece by Using a Step Drill Bit
0 cites
US118656272024
Twist Drill
0 cites
US115544242023
Twist Drill
0 cites