Can US visa be renewed before expiry?

Related questions

1. Can I renew my US visa in the US?
2. How long is a US tourist visa valid for?
3. Is US visa valid on Old passport?
4. How long does it take to get esta?
5. How can I get job in USA?
6. How much is a US visa from Australia?
7. WHO issued visa?
8. What happens if you declare more than 10000 US?
9. Which is visa number in US visa?
10. How much is US visa renewal fee?

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