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  2. Harbor Freight Tools - Wikipedia

    en.wikipedia.org/wiki/Harbor_Freight_Tools

    Harbor Freight Tools, commonly referred to as Harbor Freight, is an American privately held tool and equipment retailer, headquartered in Calabasas, California. It operates a chain of retail stores, as well as an e-commerce business. The company employs over 28,000 people in the United States, [5] and has over 1,500 locations in 48 states. [6] [7]

  3. Coupon - Wikipedia

    en.wikipedia.org/wiki/Coupon

    Some retailers and companies use verification methods such as unique barcodes, coupon ID numbers, holographic seals, and watermarked paper as protection from unauthorized copying or use. Other than newspapers, there are also coupon book publishers and retailers who compile vouchers and coupons into books, either for sale or free.

  4. Extreme Couponing - Wikipedia

    en.wikipedia.org/wiki/Extreme_Couponing

    Extreme couponing is an activity that combines shopping skills with couponing in an attempt to save as much money as possible while accumulating the most groceries. The concept of "extreme couponers" was first mentioned by The Wall Street Journal on March 8, 2010, in an article entitled "Hard Times Turn Coupon Clipping Into the Newest Extreme Sport". [2]

  5. Polyurethane foam - Wikipedia

    en.wikipedia.org/wiki/Polyurethane_foam

    An assortment of polyurethane foam products for cushioning and insulation. Polyurethane foam is a solid polymeric foam based on polyurethane chemistry. As a specialist synthetic material with highly diverse applications, polyurethane foams are primarily used for thermal insulation and as a cushioning material in mattresses, upholstered furniture or as seating in vehicles.

  6. Current limiting - Wikipedia

    en.wikipedia.org/wiki/Current_limiting

    An inrush current limiter is a device or devices combination used to limit inrush current. Passive resistive components such as resistors (with power dissipation drawback), or negative temperature coefficient (NTC) thermistors are simple options while the positive one (PTC) is used to limit max current afterward as the circuit has been operating (with cool-down time drawback on both).

  7. Crowbar (circuit) - Wikipedia

    en.wikipedia.org/wiki/Crowbar_(circuit)

    High voltage crowbars are used for HV tube (klystron and IOT) protection. Many bench top power supplies have a crowbar circuit to protect the connected equipment. Microwave ovens often use a microswitch that acts as a crowbar circuit in the door latch assembly. This monitor switch will absolutely prevent the magnetron from being energized with ...

  8. Channel wing - Wikipedia

    en.wikipedia.org/wiki/Channel_wing

    Channel Wing aircraft CCW-5. The channel wing is an aircraft wing principle developed by Willard Ray Custer in the 1920s. The most important part of the wing consists of a half-tube with an engine placed in the middle, driving a propeller placed at the rear end of the channel formed by the half-tube. Antonov Izdeliye 181 Experimental

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