Files are a jeweler's best friend and we should all know at least the basics about them. Rasp files are great for matt carving wax and a mill curved tooth file is useful when working with injecting wax, it doesn't clog as fast as a standard one.
Here are videos that helped me with the knowledge about use & care.
Photo of the book:
https://www.collectorsweekly.com/stories/101884-1950--nicholson-file-company-booklet?in=all
Filosophy-Use & Care of Files
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