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  2. Take 20% Off Raycon Earbuds, Headphones and Speakers ... - AOL

    www.aol.com/entertainment/20-off-raycon-earbuds...

    These Basic Earbuds. The Work Earbuds Classic. Raycon. For everyday wear that’s easy to take in and out, these buds are the perfect pick! See it! Get The Work Earbuds Classic (originally $120 ...

  3. The best tech deals to shop this Prime Day - AOL

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    1More: Up to 40% off earbuds and headphones. Pny: Up to 25% off memory cards and flash drives. Raycon: Up to 30% earbuds, headphones and speakers. Moft: Up to 20% laptop and phone accessories ...

  4. Coupon - Wikipedia

    en.wikipedia.org/wiki/Coupon

    Believed to be the first coupon ever, this ticket for a free glass of Coca-Cola was first distributed in 1888 to help promote the drink. By 1913, the company had redeemed 8.5 million tickets. [6] Coca-Cola's 1888-issued "free glass of" is the earliest documented coupon. [6] [7] Coupons were mailed to potential customers and placed in magazines ...

  5. GS1 DataBar Coupon - Wikipedia

    en.wikipedia.org/wiki/GS1_DataBar_Coupon

    GS1 DataBar Stacked Omni-Directional barcode symbol encoding 00123456789012. The GS1 Databar Coupon code has been in use in retail industry since the mid-1980s. At first, it was a UPC with system ID 5. Since UPCs cannot hold more than 12 digits, it required another barcode to hold additional information like offer code, expiration date and ...

  6. Morse code - Wikipedia

    en.wikipedia.org/wiki/Morse_code

    Chart of the Morse code 26 letters and 10 numerals [1]. This Morse key was originally used by Gotthard railway, later by a shortwave radio amateur [2]. Morse code is a telecommunications method which encodes text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs.

  7. Headphones - Wikipedia

    en.wikipedia.org/wiki/Headphones

    One of the earliest companies to make headphones for wireless operators was the Holtzer-Cabot Company in 1909. [20] They were also makers of head receivers for telephone operators and normal telephone receivers for the home. [20] Another early manufacturer of headphones was Nathaniel Baldwin. [21]