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<p>[QUOTE="Voyageur, post: 3108016, member: 83128"]Tantalum (Ta) Atomic Number 73</p><p><br /></p><p>Tantalum is a chemical element that finds use in four areas: high-temperature applications, such as aircraft engines; electrical devices, such as capacitors; surgical implants and handling corrosive chemicals. It is rarely used as an alloying agent because it tends to make metals brittle. Tantalum resists corrosion and is almost impervious to chemical attack, for this reason it has been employed in chemical industry, e.g. for heat exchanger in boilers where strong acids are vaporized. It was discovered in 1802 but not refined in a pure form until 1906.</p><p><br /></p><p>Daniel uses quite a few allegorical components in the design of his 2006 centennial medal. The medal is 76 mm, .995 pure Tantalum clad copper. These were 'test strikes' with two slightly different obverse designs and the same reverse. There were two finishes for each design, Satin and Semi Proof-like. This example is Semi Proof-like and the most common version with mintage of 2. Each of the other versions & finishes have a mintage of 1.</p><p><br /></p><p>Hope the information was helpful.[/QUOTE]</p><p><br /></p>
[QUOTE="Voyageur, post: 3108016, member: 83128"]Tantalum (Ta) Atomic Number 73 Tantalum is a chemical element that finds use in four areas: high-temperature applications, such as aircraft engines; electrical devices, such as capacitors; surgical implants and handling corrosive chemicals. It is rarely used as an alloying agent because it tends to make metals brittle. Tantalum resists corrosion and is almost impervious to chemical attack, for this reason it has been employed in chemical industry, e.g. for heat exchanger in boilers where strong acids are vaporized. It was discovered in 1802 but not refined in a pure form until 1906. Daniel uses quite a few allegorical components in the design of his 2006 centennial medal. The medal is 76 mm, .995 pure Tantalum clad copper. These were 'test strikes' with two slightly different obverse designs and the same reverse. There were two finishes for each design, Satin and Semi Proof-like. This example is Semi Proof-like and the most common version with mintage of 2. Each of the other versions & finishes have a mintage of 1. Hope the information was helpful.[/QUOTE]
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