A couple of days ago I posted about an all in one shaving kit. As mentioned, that patent is cited by a couple of much more resent patents, including this one from 1991 for a portable shaving brush.
As I keep repeating, inventions are about solving problems. Some are imaginary, others are real. And the problem Paul Hiromura tried to solve was traveling with a brush. To quote from the introduction to his patent:
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