How would a salt and water solution clean a penny but a vinegar and salt solution will not clean a penny?
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What is the use of worm gears?
Define what other events in history might have affected the growth of metallurgy?
what other events in history might have affected the growth of metallurgy?
What is the composition of d2?
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Explain a silver and deming drill brit?
Is there any way through hardening and anodizing some type of aluminum, it could be as hard as steel? I have hardened steel rollers that run up and down on a ramp along with spring pressure. Alternatively, if you are familiar with snowmobiles, the rollers run on the helix on the secondary clutch.