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  • Ralphs

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    Ralphs is an American major supermarket chain in the Southern California area and the largest subsidiary of Cincinnati-based Kroger. It is the oldest such chain west of the Mississippi River and by 2015, there were 200 locations. Kroger also operates stores under the Food 4 Less and Foods Co. names in California.

  • Shopping cart

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    A row of parked shopping carts equipped with coin-operated locking mechanisms Shopping cart A shopping cart (American English) or trolley (British English), also known by a variety of other names, is a cart supplied by a shop, especially supermarkets, for use by customers inside the shop for transport of merchandise to the checkout counter during shopping. In many cases customers can then also use the cart to transport their purchased goods to their vehicles, but some carts are designed to prevent them from leaving the shop. In many places in the United States and the United Kingdom, customers are allowed to leave the carts in designated areas within the parking lot, and store personnel will return the carts to the storage area. In many continental European premises, however, coin- (or token-) operated locking mechanisms are provided to encourage shoppers to return the carts to the correct location after use. Studies have shown that it is advisable for shoppers to sanitize the handles and basket areas prior to handling them or filling them with groceries due to high levels of bacteria that typically live on shopping carts.

  • Heliograph

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    Fig. 1: Signaling with a Mance heliograph, 1910 A heliograph (helios (), meaning "sun", and graphein (), meaning "write") is a wireless telegraph that signals by flashes of sunlight (generally using Morse code) reflected by a mirror. The flashes are produced by momentarily pivoting the mirror, or by interrupting the beam with a shutter. The heliograph was a simple but effective instrument for instantaneous optical communication over long distances during the late 19th and early 20th century. Its main uses were military, survey and forest protection work. Heliographs were standard issue in the British and Australian armies until the 1960s, and were used by the Pakistani army as late as 1975.

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