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  2. Box-spring - Wikipedia

    en.wikipedia.org/wiki/Box-spring

    Standard "high profile" box springs are 9 inches (23 cm) in height, whereas "low profile" box springs are between 5 and 5.5 inches (13 and 14 cm). Changing the thickness of the box spring and mattress requires revisions to the mattress and box spring coil stiffness. This is often why box springs and mattresses are matched and sold in pairs.

  3. Mattress Performance (Carry That Weight) - Wikipedia

    en.wikipedia.org/wiki/Mattress_Performance...

    The mattress later became the focus of the piece. [25] Sulkowicz's thesis was supervised by artist Jon Kessler, a professor at Columbia. As the idea for Mattress Performance developed, Kessler and Sulkowicz discussed the nature of endurance art and the work of Tehching Hsieh, Marina Abramović, Ulay and Chris Burden. [26]

  4. XTRMNTR - Wikipedia

    en.wikipedia.org/wiki/XTRMNTR

    XTRMNTR (pronounced "Exterminator") is the sixth studio album by Scottish rock band Primal Scream.It was first released on 31 January 2000 in the United Kingdom by Creation Records and on 2 May 2000 in the United States by Astralwerks. [1]

  5. Marshall coil - Wikipedia

    en.wikipedia.org/wiki/Marshall_coil

    Marshall coils were invented in 1899 by Canadian-born James Marshall, a machinist and engineer who was born near Haldimand, Ontario, Canada.He received a Canadian patent [1] in 1900, and United States [2] and United Kingdom [3] [4] patents in 1902.

  6. Spring Air Company - Wikipedia

    en.wikipedia.org/wiki/Spring_Air_Company

    Spring Air Company is a mattress company based in the United States.It was founded in Chicago in 1926 when Francis Karr patented a mattress design with free-end coils. Because of the heavy weight, high transportation costs, and low value per unit weight of mattresses, they are often manufactured lo

  7. Tyler Howe - Wikipedia

    en.wikipedia.org/wiki/Tyler_Howe

    The company later changed its name to Howe Spring-Bed Company, and opened a showroom at 173 Canal Street in New York City. [1] Howe and his son later patented a number of improvements to the box-spring, [7] and Howe became very wealthy. [6] Howe was healthy and still working at his factory even at the end of his life. [1]

  8. Duality gap - Wikipedia

    en.wikipedia.org/wiki/Duality_gap

    This alternative "duality gap" quantifies the discrepancy between the value of a current feasible but suboptimal iterate for the primal problem and the value of the dual problem; the value of the dual problem is, under regularity conditions, equal to the value of the convex relaxation of the primal problem: The convex relaxation is the problem ...

  9. Upholstery coil springs - Wikipedia

    en.wikipedia.org/wiki/Upholstery_Coil_Springs

    Prior to the early 1900s, springs were used as bed bases or box springs; these spring sets were not covered with fabrics. There were no "innerspring" mattresses manufactured until after 1900. Bushnell's patent has been cited [ 26 ] as an innerspring but it was an under bed spring--which in the mid-1800s was also called a mattress or base layer ...

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