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  2. Mint-made errors - Wikipedia

    en.wikipedia.org/wiki/Mint-made_errors

    1918/7 Buffalo nickel; 1918/7-S Standing Liberty quarter; 1937-D 3-legged Buffalo nickel; 1942/1 Mercury dime; 1942/1-D Mercury dime; 1943 copper cent; 1944 steel cent; 1955 doubled die obverse cent; 1958 handsome mule Franklin half dollar; 1970-S doubled die obverse cent with a small or large date; 1972 doubled die obverse cent; 1982 No P dime

  3. United States nickel mintage figures - Wikipedia

    en.wikipedia.org/wiki/United_States_nickel...

    Key dates for the series include the 1939-D, and 1950-D nickels. The 1939-D nickel with a mintage of 3,514,000 coins is the second lowest behind the 1950-D nickel. The cause of the key date of 1939 stems from the new design that excited collectors the year prior, after the initial hype had settled down fewer nickels were saved.

  4. Postage stamps and postal history of the United States

    en.wikipedia.org/wiki/Postage_stamps_and_postal...

    A normal U. S. stamp was wrapped around a circular cardboard disc and then placed inside a coin-like circular brass jacket. A transparent mica window in the jacket allowed the face of the stamp to be seen. All eight denominations available in 1861–62, ranging from 1 cent to 90 cents, were offered in encased versions.

  5. Liberty Head nickel - Wikipedia

    en.wikipedia.org/wiki/Liberty_Head_nickel

    The Liberty Head nickel, sometimes referred to as the V nickel because of its reverse (or tails) design, is an American five-cent piece. It was struck for circulation from 1883 until 1912, with at least five pieces being surreptitiously struck dated 1913. The obverse features a left-facing image of the goddess of Liberty.

  6. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  7. Lathe faceplate - Wikipedia

    en.wikipedia.org/wiki/Lathe_faceplate

    A lathe faceplate is a basic workholding accessory for a wood or metal turning lathe. It is a circular metal (usually cast iron) plate which fixes to the end of the lathe spindle. The workpiece is then clamped to the faceplate, typically using t-slot nuts in slots in the faceplate, or less commonly threaded holes in the faceplate itself.

  8. Nickel electroplating - Wikipedia

    en.wikipedia.org/wiki/Nickel_electroplating

    Nickel electroplating is a process of depositing nickel onto a metal part. Parts to be plated must be clean and free of dirt, corrosion, and defects before plating can begin. [ 3 ] To clean and protect the part during the plating process, a combination of heat treating , cleaning, masking, pickling , and etching may be used. [ 1 ]

  9. U.S. Military connector specifications - Wikipedia

    en.wikipedia.org/wiki/U.S._Military_connector...

    A MIL-DTL-38999 circular connector plated with a nickel–teflon composite. Left: plug (male) type connector; Right: receptacle (female) type connector) Electrical or fiber-optic connectors used by U.S. Department of Defense were originally developed in the 1930s for severe aeronautical and tactical service applications, and the Type "AN" series set the standard for modern military circular ...