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  2. Ring binder - Wikipedia

    en.wikipedia.org/wiki/Ring_binder

    A ring binder, folded A Swiss "federal binder" (32 cm × 28 cm × 7 cm or 12.6 by 11.0 by 2.8 inches), created in 1908. Ring binders (loose leaf binders, looseleaf binders, or sometimes called files in Britain) are large folders that contain file folders or hole punched papers (called loose leaves). These binders come in various sizes and can ...

  3. Trapper Keeper - Wikipedia

    en.wikipedia.org/wiki/Trapper_Keeper

    A Pink Five Star Trapper Keeper. Trapper Keeper is a brand of loose-leaf binder created by Mead.Popular with students in the United States and parts of Latin America from the 1970s to the 1990s, it featured sliding plastic rings (instead of standard snap-closed metal binder rings), folders, and pockets to keep schoolwork and papers, and a wrap-around flap with a Velcro closure (originally a ...

  4. Loose leaf - Wikipedia

    en.wikipedia.org/wiki/Loose_leaf

    Loose leaf. A loose leaf (also loose leaf paper, filler paper or refill paper) is a piece of paper of any kind that is not bound in place, or available on a continuous roll, and may be punched and organized as ring-bound (in a ring binder) or disc-bound. Loose leaf paper may be sold as free sheets, or made up into notepads, where perforations ...

  5. Leucine zipper - Wikipedia

    en.wikipedia.org/wiki/Leucine_zipper

    The leucine zipper is formed by amphipathic interaction between two ZIP domains. The ZIP domain is found in the alpha-helix of each monomer, and contains leucines, or leucine-like amino acids. These amino acids are spaced out in each region's polypeptide sequence in such a way that when the sequence is coiled in a 3D alpha-helix, the leucine ...

  6. Timeline of United States inventions (1890–1945) - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_United_States...

    1893 Zipper. Three zippers: metal, plastic, and nylon. The zipper is a popular device for temporarily joining two edges of fabric. Zippers are found on trousers, jeans, jackets, and luggage. Whitcomb L. Judson was an American mechanical engineer from Chicago who was the first to invent, conceive of the idea, and to construct a workable zipper. [35]

  7. 16 Best Back-to-School Items To Buy at Walmart With a $50 Budget

    www.aol.com/finance/16-best-back-school-items...

    Pen+Gear D-Ring Binder. Price: $3.38. This 1-inch D-ring binder offers the perfect place to store filler paper. If a larger-size binder is needed, Walmart offers a 2-inch option for $4.94.

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