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  2. Third-party grading - Wikipedia

    en.wikipedia.org/wiki/Third-party_grading

    Third-party grading (TPG) refers to coin grading & banknote grading authentication, attribution, and encapsulation by independent certification services.. These services will, for a tiered fee depending on the value of the coin, "slab" a coin and assign a grade of 1–70 on the Sheldon grading system, with 1 being the lowest grade, with only faint details visible to 70, a practically perfect ...

  3. File:A silver proof state quarter of USA, graded by ICG ...

    en.wikipedia.org/wiki/File:A_silver_proof_state...

    to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.

  4. Coin grading - Wikipedia

    en.wikipedia.org/wiki/Coin_grading

    Coin grading [1] is the process of determining the grade or condition of a coin, one of the key factors in determining its collectible value. A coin's grade is generally determined by six criteria: strike, preservation, luster, color, attractiveness, and occasionally the country/state in which it was minted. Several grading systems have been ...

  5. Paper currency grading - Wikipedia

    en.wikipedia.org/wiki/Paper_currency_grading

    No major damage such as tears or stains should be on notes in this grade. 15 Fine F Notes in this grade will have a good body, sound paper, bright colors, and above-average eye appeal but miss the next grade up due to too many folds or too much circulation. Folds cause a loss of paper durability which may be present in isolated areas.

  6. Rolling (metalworking) - Wikipedia

    en.wikipedia.org/wiki/Rolling_(metalworking)

    Rolling schematic view Rolling visualization. In metalworking, rolling is a metal forming process in which metal stock is passed through one or more pairs of rolls to reduce the thickness, to make the thickness uniform, and/or to impart a desired mechanical property.

  7. Tandem rolling mill - Wikipedia

    en.wikipedia.org/wiki/Tandem_rolling_mill

    Each stand of a tandem mill is set up for rolling using the mill-stand's spring curve [clarification needed] and the compressive curve of the metal so that both the rolling force and the exit thickness of each stand are determined. For mills rolling thinner strip, bridles may be added either at the entry and/or the exit to increase the strip ...