Check valves are designed to pass flow in one direction with minimum resistance
and to prevent reverse or back flow with minimal leakage.
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The purpose of 4NF, or the 4th Normal Form, is to remove multivalued dependencies. This means that by adding a new value to the database, multiple other values are not required to maintain consistency.
Please check your pocket change. It's a common circulation coin with no added value. Huge numbers were minted.
Morgan dollars were minted from 1878 to 1904 and in 1921. Please check your coin again and post a new question
Please check your pocket change. Over 3.5 BILLION dimes were minted in 1999 so they're not rare and not scarce. If you found it in change it has no extra value. A nice uncirculated one might retail for a dollar or so.
Please check your date again. "Bison" nickels were minted in 2005. If that's what you have, it's only worth face value if you got it in change. A nice uncirculated one might bring 50¢ to $10 depending on its quality.