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A UPC barcode. The Universal Product Code (UPC or UPC code) is a barcode symbology that is used worldwide for tracking trade items in stores.. The chosen symbology has bars (or spaces) of exactly 1, 2, 3, or 4 units wide each; each decimal digit to be encoded consists of two bars and two spaces chosen to have a total width of 7 units, in both an "even" and an "odd" parity form, which enables ...
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Modified UTF-8 strings never contain any actual null bytes but can contain all Unicode code points including U+0000, [67] which allows such strings (with a null byte appended) to be processed by traditional null-terminated string functions. All known Modified UTF-8 implementations also treat the surrogate pairs as in CESU-8.
For example, a coupon may offer a $1.00 discount when the consumer purchases a specific brand and flavor of toothpaste. During the early years of its use, many checkout registers systems could not read GS1 DataBar barcodes. Consequently, coupons would have both a GS1 DataBar coupon and a traditional UPC/EAN barcode coupon for older registers.
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]
In a market with chronic shortages, price fluctuation allowed people with powerful connections to buy goods at low prices and sell at market prices. Party bureaucrats in charge of economic management had enormous incentives to engage in such arbitrage . [ 42 ]