His inventions include a guide robot, an earthquake alarm and an electronic door lock.
他的发明包括一个导盲机器人、一台地震报警器和一把电子门锁。
Valve Guide, Valve Seat, Valve Lock, Valve Spring Retainer, Casting Products.
气门导管，气门座圈，气门锁片，气门弹簧座，铸件系列。
Valve Guide, Valve Seat, Valve Lock, Valve Spring Retainer, Casting Products.
气门导管，气门座圈，气门锁片，气门弹簧座，铸件系列。
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