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  2. 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 ...

  3. 3D printing processes - Wikipedia

    en.wikipedia.org/wiki/3D_printing_processes

    EBM manufactures parts by melting metal powder layer by layer with an electron beam in a high vacuum. Unlike metal sintering techniques that operate below melting point, EBM parts are void-free. Binder jetting. The binder jetting 3D printing technique is the deposition of a binding adhesive agent onto layers of material, usually powdered.

  4. Cemented carbide - Wikipedia

    en.wikipedia.org/wiki/Cemented_carbide

    Cemented carbide. Circular saw blade with tungsten-carbide inserts. Cemented carbides are a class of hard materials used extensively for cutting tools, as well as in other industrial applications. It consists of fine particles of carbide cemented into a composite by a binder metal. Cemented carbides commonly use tungsten carbide (WC), titanium ...

  5. Multi-material 3D printing - Wikipedia

    en.wikipedia.org/wiki/Multi-material_3D_printing

    Multi-material 3D printing is the additive manufacturing procedure of using multiple materials at the same time to fabricate an object. Similar to single material additive manufacturing it can be realised through methods such as FFF, SLA and Inkjet (material jetting) 3D printing. By expanding the design space to different materials, it ...

  6. Bookbinding - Wikipedia

    en.wikipedia.org/wiki/Bookbinding

    Bookbinding is the process of building a book, usually in codex format, from an ordered stack of paper sheets with one's hands and tools, or in modern publishing, by a series of automated processes. Firstly, one binds the sheets of papers along an edge with a thick needle and strong thread. One can also use loose-leaf rings, binding posts, twin ...

  7. Porphyrin - Wikipedia

    en.wikipedia.org/wiki/Porphyrin

    Porphyrin. Porphine, the parent porphyrin. Porphyrins ( / ˈpɔːrfərɪn / POR-fər-in) are a group of heterocyclic macrocycle organic compounds, composed of four modified pyrrole subunits interconnected at their α carbon atoms via methine bridges (=CH−). In vertebrates, an essential member of the porphyrin group is heme, which is a ...

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