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2. Mattress protector - Wikipedia

   en.wikipedia.org/wiki/Mattress_protector

   A mattress protector (also mattress cover, mattress pad may mean this or a mattress topper [1]) is an item of removable bedding that sits on top of, or encases, a mattress to protect it. Some mattress protectors also provide protection to the person sleeping on the mattress from allergens and irritants such as dust mites , bed bugs , mold , and ...

3. Mattress pad - Wikipedia

   en.wikipedia.org/wiki/Mattress_pad

   A mattress topper on a boxspring mattress. A mattress pad, mattress topper, or underpad is designed to lie atop a mattress.Made from a variety of materials including wool, cotton, memory foam, feather and latex, [1] its function is to provide an extra layer of comfort, especially when the existing mattress is worn or uncomfortable.

4. Cover (topology) - Wikipedia

   en.wikipedia.org/wiki/Cover_(topology)

   The cover is said to be an open cover if each of its members is an open set. That is, each is contained in , where is the topology on X). [1] A simple way to get a subcover is to omit the sets contained in another set in the cover. Consider specifically open covers.

5. Set cover problem - Wikipedia

   en.wikipedia.org/wiki/Set_cover_problem

   In the fractional set cover problem, it is allowed to select fractions of sets, rather than entire sets. A fractional set cover is an assignment of a fraction (a number in [0,1]) to each set in S {\displaystyle {\mathcal {S}}} , such that for each element x in the universe, the sum of fractions of sets that contain x is at least 1.

6. Surge protector - Wikipedia

   en.wikipedia.org/wiki/Surge_protector

   Surge Protection Device (SPD) for installation in a low-voltage distribution board. A surge protector (or spike suppressor, surge suppressor, surge diverter, [1] surge protection device (SPD), transient voltage suppressor (TVS) or transient voltage surge suppressor (TVSS)) is an appliance or device intended to protect electrical devices in alternating current (AC) circuits from voltage spikes ...

7. Stone Protectors - Wikipedia

   en.wikipedia.org/wiki/Stone_Protectors

   Stone Protectors is a 1993 multi-media entertainment property consisting primarily of an action figure line and animated series. [1] The series also had a tie-in video game released for the Super NES and the Sega Genesis. It served as a late attempt to market the troll doll craze of the early 1990s to young boys.