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Came across the patent described above on google, whilst searching for the same product
https://patents.google.com/patent/US8122606
Does anyone know if they ever utilised this? I use cartridge razor's ironically for safety reasons (mental health, don’t think I need to go further) and to be honest I struggle to know when a razor needs replacing other than when it’s very uncomfortable to use and was hoping for something with some kinda refill indicator.
I do not think you can rely on lube strips as an indicator as they often wear out well before the blades.
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