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Well, not surprising, just unexpected as we haven't really been trying to optimize the process by that. This was industrial-like interface so there was no keyboard shortcuts in the usual sense, other than hitting Tab to move through the input fields (but that was supported with touchscreen too). The main speed up was because of higher tolerance for imprecision that mechanical system gives you. You can hit the button while doing something else, as you walk by, or use it wearing gloves, or even hit it with elbow without having to lay down the tools, which turned out to be a huge time saver in their specific use case. We've also added some extra big buttons next to the keyboard specially for the common tasks, to maximize on this effect.

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