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  2. Ring binder - Wikipedia

    en.wikipedia.org/wiki/Ring_binder

    The most common type in Canada and the United States is a three-ring system for letter size pages (8 + 1 ⁄ 2 by 11 inches or 220 mm × 280 mm), whose size is similar to ISO 216-based A4 size. A standard 8 + 1 ⁄ 2 by 11 inches (220 mm × 280 mm) sheet of paper has three holes with spacing of 4 + 1 ⁄ 4 inches (110 mm).

  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. Foolscap folio - Wikipedia

    en.wikipedia.org/wiki/Foolscap_folio

    Folded foolscap was often 12 + 1 ⁄ 2 by 16 inches (317 mm × 406 mm), but smaller and larger sizes were also found. [14] Legal foolscap of 8 by 24 inches (203 mm × 610 mm) was always sold ruled and folded in half at the printers by a folding machine , resulting in a leaflet 8 by 12 inches (203 mm × 305 mm), almost the same as modern A4 ...

  5. Power dividers and directional couplers - Wikipedia

    en.wikipedia.org/wiki/Power_dividers_and...

    Hybrid ring coupler in planar format. The hybrid ring coupler, also called the rat-race coupler, is a four-port 3 dB directional coupler consisting of a 3λ/2 ring of transmission line with four lines at the intervals shown in figure 12. Power input at port 1 splits and travels both ways round the ring.

  6. Linear-feedback shift register - Wikipedia

    en.wikipedia.org/wiki/Linear-feedback_shift_register

    Important LFSR-based stream ciphers include A5/1 and A5/2, used in GSM cell phones, E0, used in Bluetooth, and the shrinking generator. The A5/2 cipher has been broken and both A5/1 and E0 have serious weaknesses. [14] [15] The linear feedback shift register has a strong relationship to linear congruential generators. [16]

  7. Punched pocket - Wikipedia

    en.wikipedia.org/wiki/Punched_pocket

    The thinnest pockets may be less than 2 mil (0.051 mm), while the thickest are over 4 mil (0.10 mm). Punched pockets are made in several sizes, with the most prevalent being A4 (210 mm × 297 mm; 8.3 in × 11.7 in) for Europe, or 8.5 by 11 inches (216 by 279 mm) for the United States.

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