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These Japanese Tapestry Artisans File Their Fingernails Into Thread-Channeling Tools
Jewish ritual slaughterers (shochtim) use their fingernails to check the sharpness of their knives and as a result, often have an unusually long fingernail on one of their fingers. See here (http://www.thekosheromnivoresquest.com/blog/deconstructing-kosher-slaughter-part-2-the-basics, there's a picture there too):
Guitarists also grow their nails to be used as guitar picks. Richie Havens being a famous example of one such guitarist.