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A prototype is an important aspect in your product development process. And even though virtual prototypes are becoming increasingly popular, many inventors still make an actual physical prototype.
Documented in your inventor's log, a photo of your prototype and pages that describe its making serve as good proof that you were the first inventor. Your prototype can also help you work out product flaws. No matter how advanced a virtual prototype may seem, there are practical ergonomic reasons for wanting to hold a prototype in your hands, feel its weight and ease of use.