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2. These are the top 100 Black Friday deals, according to Walmart

   www.aol.com/lifestyle/these-are-the-top-100...

   Walmart is keeping track of its 100 most popular deals for Black Friday weekend, including TVs, AirPods, HP laptops, and more.

3. All of the best Black Friday deals: Amazon, Walmart, Wayfair ...

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   Apple 2022 MacBook Air, $749 (was $1,000) at Amazon. Apple iPad 10th Gen, $250 (was $350) at Amazon with on-page coupon. ... Best Black Friday Deals on Kitchen Gadgets & Appliances.

4. Ultra low frequency - Wikipedia

   en.wikipedia.org/wiki/Ultra_low_frequency

   Ultra low frequency (ULF) is the ITU designation [1] [2] for the frequency range of electromagnetic waves between 300 hertz and 3 kilohertz, corresponding to wavelengths between 1,000 to 100 km. In magnetosphere science and seismology , alternative definitions are usually given, including ranges from 1 mHz to 100 Hz, [ 3 ] 1 mHz to 1 Hz, [ 4 ...

5. Walmart's best early Black Friday deals under $100: Save on ...

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   Walmart's best early Black Friday deals under $100: Save on Apple, Shark, Barbie, Ninja and more. Brittany Nims. Updated December 8, 2024 at 3:14 PM.

6. Reference tone - Wikipedia

   en.wikipedia.org/wiki/Reference_tone

   In telecommunication, a standard test tone is a pure tone with a standardized level generally used for level alignment of single links and of links in tandem. [1]For standardized test signal levels and frequencies, see MIL-STD-188-100 for United States Department of Defense (DOD) use, and the Code of Federal Regulations Title 47, part 68 for other Government agencies.

7. Programmable sound generator - Wikipedia

   en.wikipedia.org/wiki/Programmable_sound_generator

   A programmable sound generator (PSG) is a sound chip that generates (or synthesizes) audio wave signals built from one or more basic waveforms, and often some kind of noise. PSGs use a relatively simple method of creating sound compared to other methods such as frequency modulation synthesis or pulse-code modulation .