Seeing the apparent ease with which UBM TechInsights tears it down, it's a wonder to me that Apple is so resistant in their interviews. It's difficult to get through an Apple interview without bumping into a "proprietary concern." Yet, it appears from this teardown that reverse engineering of the hardware must be commonplace.
Linear guides are one of the most important components required for the design of automated or computer-controlled equipment. Aluminum profile extrusions, used for these guides, can enable designed-in functional features.
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