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Re:Electronics That Last: How I Built an Heirloom Laptop by tim333 on Saturday January 16, 2016 @04:13AM (#10914807)
Stone knives 3.3 million years:

http://archaeologynewsnetwork.blogspot.com/2015/04/worlds-ol...

Tutankhamun's metal ones from 3000 odd years ago look quite modern:

https://www.google.com/search?q=Tutankhamun+knife&num=20&tbm...

Re:Electronics That Last: How I Built an Heirloom Laptop by kiiski on Saturday January 16, 2016 @06:06AM (#10914989)
I'd say that knives can be either inheritable or usable, but not both. Like all tools they will be worn pretty quickly if used actively.