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2. Aluminum disc - Wikipedia

   en.wikipedia.org/wiki/Aluminum_disc

   Aluminum disc. In the field of audio recording, an aluminum disc ( aluminium in the UK and elsewhere) is a phonograph (gramophone in the UK) record made of bare aluminum, a medium introduced in the late 1920s for making one-off recordings. Although sometimes used for making amateur studio or home recordings or in coin-operated "record-your ...

3. Glossary of numismatics - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_numismatics

   A coin with one type of metal in the center with an outer ring of a different metal. Examples are the 1 and 2 Euro coins and the Canadian "toonie" two-dollar coin. blank. Also called a planchet or flan. 1. A prepared disk of metal on which the design for a coin will be stamped. [1] 2. The un-struck or flat side of a uniface coin or medal. brass

4. Aluminium - Wikipedia

   en.wikipedia.org/wiki/Aluminium

   Chemically, aluminium is a post-transition metal in the boron group; as is common for the group, aluminium forms compounds primarily in the +3 oxidation state. The aluminium cation Al 3+ is small and highly charged; as such, it has more polarizing power, and bonds formed by aluminium have a more covalent character.

5. AOL Mail

   mail.aol.com

   You can find instant answers on our AOL Mail help page. Should you need additional assistance we have experts available around the clock at 800-730-2563.

6. Engraving - Wikipedia

   en.wikipedia.org/wiki/Engraving

   Other terms often used for printed engravings are copper engraving, copper-plate engraving or line engraving. Steel engraving is the same technique, on steel or steel-faced plates, and was mostly used for banknotes, illustrations for books, magazines and reproductive prints, letterheads and similar uses from about 1790 to the early 20th century, when the technique became less popular, except ...

7. Are Blank Coins Valuable? If You Can Find One, It Could Be ...

   www.aol.com/blank-coins-valuable-one-could...

   According to a 2021 article on The Spruce Crafts website, most blank coins are worth a few dollars if they are “clad,” meaning they feature multiple layers of metal such as copper and nickel.