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  2. Ring binder - Wikipedia

    en.wikipedia.org/wiki/Ring_binder

    There is a variant for half-letter size pages (8 + 1 ⁄ 2 by 5 + 1 ⁄ 2 inches or 220 mm × 140 mm), whose three rings are 2 + 3 ⁄ 4 inches (70 mm) apart. "Ledger" size binders hold 11-by-17-inch (28 by 43 cm) paper, and may use standard 3-ring spacing or multiple additional rings.

  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. List of prime knots - Wikipedia

    en.wikipedia.org/wiki/List_of_prime_knots

    0 1: 0a1 — — 0 Trefoil knot: 3 1: 3a1 4 6 2 [3] 123:123 Figure-eight knot: 4 1: 4a1 4 6 8 2 [22] 1234:2143 1231\4324 Cinquefoil knot: 5 1: 5a2 6 8 10 2 4 [5] 12345:12345 Three-twist knot: 5 2: 5a1 4 8 10 2 6 [32] 12345:12543 1231\452354 Stevedore knot: 6 1: 6a3 4 8 12 10 2 6 [42] 123456:216543 1231\45632654 6 2 knot: 6 2: 6a2 4 8 10 12 2 6 ...

  5. Pinwheel calculator - Wikipedia

    en.wikipedia.org/wiki/Pinwheel_calculator

    A pinwheel calculator is a class of mechanical calculator described as early as 1685, and popular in the 19th and 20th century, calculating via wheels whose number of teeth were adjustable. These wheels, also called pinwheels, could be set by using a side lever which could expose anywhere from 0 to 9 teeth, and therefore when coupled to a ...

  6. Little Professor - Wikipedia

    en.wikipedia.org/wiki/Little_Professor

    The Little Professor was first released by Texas Instruments on June 13, 1976. [5] As the first electronic educational toy, [6] [7] the Little Professor is a common item on calculator collectors' lists. [8] In 1976, the Little Professor cost less than $20. More than 1 million units sold in 1977. [9]

  7. Lone divider - Wikipedia

    en.wikipedia.org/wiki/Lone_divider

    There are two cases. Case A: At least one of the non-dividers marks two or more pieces as acceptable. Then, the third partner picks an acceptable piece (by the pigeonhole principle he must have at least one); the second partner picks an acceptable piece (he had at least two before, so at least one remains); and finally the divider picks the last piece (for the divider, all pieces are acceptable).

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