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  2. Harbor Freight Coupon for 20% Off - AOL

    www.aol.com/news/2011-02-16-harbor-freight...

    Replace old tools or get new ones with this Harbor Freight coupon for 20% off any one item. Expires Feb. 19, 2011. Valid in store, online, or over the phone. Use coupon code 74990607 online or ...

  3. The 20 best Thanksgiving Black Friday deals you can shop ...

    www.aol.com/lifestyle/the-20-thanksgiving-black...

    So, have a quick tour of our top 20 deals to shop right now before the Black Friday madness technically begins. Trending Black Friday deals we love Apple AirTag 4 Pack , $73 (was $99)

  4. Fire hose - Wikipedia

    en.wikipedia.org/wiki/Fire_hose

    The usual working pressure of a firehose can vary between 8 and 20 bar (800 and 2,000 kPa; 116 and 290 psi) while per the NFPA 1961 Fire Hose Standard, its bursting pressure is in excess of 110 bar. (11,000kPa; 1600psi) [2] Hose is one of the basic, essential pieces of fire-fighting equipment. It is necessary to convey water either from an open ...

  5. Heating element - Wikipedia

    en.wikipedia.org/wiki/Heating_element

    80% Ni, 20% Cr; 60% Ni, 16% Cr; 35% Ni, 20% Cr; Nichrome 80/20 is one of the most commonly used resistance heating alloys because it has relatively high resistance and forms an adherent layer of chromium oxide when it is heated for the first time. Material beneath this layer will not oxidize, preventing the wire from breaking or burning out.

  6. Pennsylvania - Wikipedia

    en.wikipedia.org/wiki/Pennsylvania

    Pennsylvania (/ ˌ p ɛ n s ɪ l ˈ v eɪ n i ə / ⓘ PEN-sil-VAY-nee-ə, lit. ' Penn's forest country '), officially the Commonwealth of Pennsylvania [b] (Pennsylvania Dutch: Pennsilfaani), [7] is a U.S. state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States.

  7. Heat exchanger - Wikipedia

    en.wikipedia.org/wiki/Heat_exchanger

    One of the widest uses of heat exchangers is for refrigeration and air conditioning. This class of heat exchangers is commonly called air coils , or just coils due to their often-serpentine internal tubing, or condensers in the case of refrigeration , and are typically of the finned tube type.

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