Some do and some don't
Refrigerator magnets, car magnets, neodymium magnets are names of small magnets.
which is the cheapest magnets
Not all magnets are made of metal. There are various types of magnets, including ceramic magnets (made of ferrite), neodymium magnets (made of neodymium, iron, and boron), and even electromagnetic magnets that are not made of metal.
magnets
Sticking things on refrigerators, some toys have magnets, there are magnets in computers and in TVs, certain doors have magnets, and most electronics have magnets.
If you mean an electric can opener, then yes. The electric motor contains an electromagnet, and the cutting arm contains a magnet to lift the can into place and hold the lid. But manual can openers usually don't, unless they were made to double as refrigerator magnets. You usually see that with bottle openers rather than can openers.
Because it is a TIN coating on the inside of cans of food {today replaced by teflon/plastic} with the majority of metal comprising of steel.
You can view images of can openers on Google Images. In addition, you will be able to find images of can openers of kitchen retailers such as Kitchen Stuff Plus.
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The Chamberlain Group is a manufacturer of garage door openers and associated Chamberlain - the company's do-it-yourself line of garage door openers
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Gate openers are sold in LIftmaster.com. Liftmaster is an elite and prestigious company that is known for selling the openers for gates. Their cheap prices and great inventory will suit your needs.
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can openers where invented in 1858 this was found on this website: http://www.ideafinder.com/history/inventions/canopener.htm
Yes Tiffany's sells very elegant letter openers. They cost about $300.
Garage door openers can be purchased from hardware and DIY stores or online though various websites. Garage door openers come in a number of different styles to suit your needs.