I have pointed it out before. Perfection is not achieved when there is nothing more to add – but rather when there is nothing more to remove. Seen through that lens, John B Lydiards 2020 patent for a shaving brush with interchangeable bristles is far from perfect.
The idea is simple enough. Different shaving brush knots have different qualities, and people prefer different knots. Some likes the softness of badger, some prefer a scritchy boar. Me, I like a good horse. But to get back on track, let us see what John had to say in the patent text
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