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People seem to be confusing having a glass substrate with having a glass cover.
The substrate goes under the E-Ink film. It is not visible. The only way to tell if an E-Ink screen has a glass or plastic substrate is to check the specifications.
The cover goes over the E-Ink screen, and is used to provide a level front to the device, along with touch screen and light guides. An example is the Kindle Oasis.
The Basic Kindle has no glass in front of the E-Ink screen, but still has a glass substrate.
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