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Precious Plastic is an open hardware plastic recycling project and is a type of open source digital commons project. The project was started in 2013 by Dave Hakkens and is now in its fourth iteration. It relies on a series of machines and tools which grind, melt, and inject recycled plastic, allowing for the creation of new products out of ...
Gentex smoke detectors are used in hospitals, hotels, offices and other buildings worldwide. [9] In the early 1990s, Gentex introduced a smoke detector equipped with a strobe light which is designed to alert deaf and hard of hearing individuals. [10]
How Infrared motion detector components work; Design advice and assembly instructions from a motion detector kit; U.S. patent 3,703,718, Infrared Intrusion Detector System, issued November 21, 1972 to Herbert L. Berman, contains a very clear explanation
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Once installed, use it to open jars and lids of any size, from small nail polish bottles to bulky pickle jar lids and more. $14 at Walmart Explore More Buying Options
Traditional smoke detectors are ionization smoke detectors which create an electric current between two metal plates, which sound an alarm when disrupted by smoke entering the chamber. Ionization smoke alarms can quickly detect the small amounts of particles produced by fast-flaming fires, such as cooking fires or those fueled by paper or ...
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Products sold with the brand include carbon monoxide detectors, smoke alarms, fire extinguishers, and other safety products like flashlights and fire escape ladders. First Alert supports fire safety in partnership with Safe Kids USA and The United States Fire Administration , providing smoke alarms at reduced cost to low-income families in the ...