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2. Kitchen hood - Wikipedia

   en.wikipedia.org/wiki/Kitchen_hood

   A kitchen hood, exhaust hood, hood fan, extractor hood, or range hood is a device containing a mechanical fan that hangs above the stove or cooktop in the kitchen. It removes airborne grease, combustion products, fumes, smoke, heat, and steam from the air by evacuation of the air and filtration. [ 1 ]

3. Microwave oven - Wikipedia

   en.wikipedia.org/wiki/Microwave_oven

   A microwave oven or simply microwave is an electric oven that heats and cooks food by exposing it to electromagnetic radiation in the microwave frequency range. [1] This induces polar molecules in the food to rotate and produce thermal energy in a process known as dielectric heating .

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5. Microwave - Wikipedia

   en.wikipedia.org/wiki/Microwave

   Practical use of microwave frequencies did not occur until the 1940s and 1950s due to a lack of adequate sources, since the triode vacuum tube (valve) electronic oscillator used in radio transmitters could not produce frequencies above a few hundred megahertz due to excessive electron transit time and interelectrode capacitance. [30]

6. Mullard–Philips tube designation - Wikipedia

   en.wikipedia.org/wiki/Mullard–Philips_tube...

   KK2 (Cap E) was a pinch-type valve fitted with an American 7-pin base. Sometimes special versions were made with US (Ux-4 to 7) bases with no change in the type number (e.g. AF2, AK1, KK2), but; in the case of Octal (IO) often a "G" would be appended to the type number; examples are ECH3G, ECH4G, EK2G, EK2G/GT, EL3G, EL3NG, KF3G, KK2G and KL4G.

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