Manufacturing razor blades.
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Previously:
https://www.homemadetools.net/forum/...556#post166719
https://www.homemadetools.net/forum/...374#post116664
https://www.homemadetools.net/forum/...053#post172025
https://www.homemadetools.net/forum/...109#post145332
https://www.homemadetools.net/forum/...187#post121169
