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How a zipper makes lock on two ends ?
Please refer zhenyu's zipper top stop machines, it widely apply to metal zipper, nylon zipper and invisable zippers.
There is metal double top stop machine, nylon u type double top stop machine, invisible top stop machine and injection top stop machine for plastic zipper.Material of metal zipper top stop: flat wire and particles material of top stop ( U type and Y type). 

Nylon zipper: U type top stop.

Invisable zipper: invisable top stop, which is widely use in women dress.

                                

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