knights american mechanical dictionary a description of tools instruments machines processes and engineering history of inventions general technological vocabulary and digest of mechanical appliances in science and the arts kfjs permutation lock biuation is discovered by the introduction of a pin into theback plate of the lock when the door is open the pin im pinges upon the inclined bead of a pintle and forces it throughthe slots of of the tumbler wheels g as they are brought intoline by turning the knob the combination is shown by theposition of the index finger when the pin 2am4arm.jpg from 昆希大学 mechanical engineering degree certificate☀️网址：zjw211 com☀️ View Photo