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  2. 3-ring release system - Wikipedia

    en.wikipedia.org/wiki/3-ring_release_system

    There are a few different variations of the 3-ring system. The original 3-ring release from the late 1970s is now known as large 3-rings. A version using smaller rings (mini rings) was introduced in the 1980s. The reasons for the development of the mini ring system and the associated smaller risers were mostly aesthetic; the mini rings do not ...

  3. Ring binder - Wikipedia

    en.wikipedia.org/wiki/Ring_binder

    The distances between holes are 80 millimetres (3.1 in) (3 × 8). 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.

  4. 50 Companies with Lifetime Warranties: If It Breaks, They’ll ...

    www.aol.com/39-companies-offer-lifetime-warranty...

    16. XIKAR. XIKAR, which makes cigar accessories, offers a limited lifetime warranty on all products. Simply drop your lighter or cigar cutter in the mail, and the company will repair or replace it ...

  5. Borromean rings - Wikipedia

    en.wikipedia.org/wiki/Borromean_rings

    [3] [18] The first work of knot theory to include the Borromean rings was a catalog of knots and links compiled in 1876 by Peter Tait. [3] In recreational mathematics, the Borromean rings were popularized by Martin Gardner, who featured Seifert surfaces for the Borromean rings in his September 1961 "Mathematical Games" column in Scientific ...

  6. Ring size - Wikipedia

    en.wikipedia.org/wiki/Ring_size

    Ring sizes can be measured physically by a paper, plastic, or metal ring sizer (as a gauge) or by measuring the inner diameter of a ring that already fits. Ring sticks are tools used to measure the inner size of a ring, and are typically made from plastic, delrin , wood, aluminium, or of multiple materials.

  7. Planar ternary ring - Wikipedia

    en.wikipedia.org/wiki/Planar_ternary_ring

    A planar ternary ring (PTR) or ternary field is special type of ternary system used by Marshall Hall [1] to construct projective planes by means of coordinates. A planar ternary ring is not a ring in the traditional sense, but any field gives a planar ternary ring where the operation T {\displaystyle T} is defined by T ( a , b , c ) = a b + c ...

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