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A clock (from the Latin cloca, "bell") is an instrument for measuring time and for measuring time intervals of less than a day—as opposed to a calendar. Those used for technical purposes, of very high accuracy, are usually called chronometers. A portable clock is called a watch. The clock in its most common modern form (in use since at least the 14th century) displays the hours, minutes and, sometimes, seconds that pass during a twelve- or twenty-four-hour period.

History


The clock is one of the oldest human inventions, requiring a physical process that will proceed at a known rate and a way to gauge how long that process has run. As the seasons and the phases of the moon can be used to measure the passage of longer periods of time, shorter processes had to be used to measure off hours and minutes. The sundial, which measures the time of day by the direction of shadows cast by the sun, was widely known in ancient times.

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Clocks of Rocks - Handcrafted and imprinted granite, slate, and stone wall and desk clocks.
Meta Description: [ Personalized gifts personalized stone desk and wall clocks granite clocks wall clocks stone gifts customized gifts personalized gifts personalized desk clocks,personalized wall clocks ]

Fotowatch, Inc. - Offers Logo, promotional and premium watches.
Meta Description: [ Your Logo Watches Supplier with over 400 different Corporate, Sports & European Style models. Promotional Premium Watches & Clocks From $4.99 Including Magic Watches (logo appears & disappears), Mechanical & 24 Hour Dial. ]

Grimm Industries, Inc. - Provides advertising and promotional clocks.
Meta Description: [ A single-source supplier of advertising clocks, signs, displays, point-of-sale and promotional materials. ]

500 Leor International - Italian company sells promotional logo watches.
Meta Description: [ Fabbrica svizzera di orologi da polso e da tasca in metallo, plastica, ceramica, oro e argento. Siamo specializzati nel private label e produciamo articoli di ottima qualit. Possiamo garantire accurata personalizzazione e prezzi eccezionali ]

Logo USA - Watches and clocks embossed with logos or slogans.
Meta Description: [ promotional tote bags, personalized t shirt, custom logo watches, embroidered golf shirts, promotional watches, custom embroidery, company logo apparel, company apparel, corporate apparel ]

Max Marketing-Neon - Offers customization of neon clocks, available in a variety of sizes.
Meta Description: [ Specializing in neon clocks, neon wall clocks, art deco clocks, motorcycle clocks, unique wall clocks, automobile clocks, neon wall clocks, automobile neon clocks, and custom neon clocks. ]

Perfect Timing, Inc. - Offer a large number of logo watch models.
Meta Description: [ Logo Watches! Custom, promotional Logo Watches from the original LogoWatches.com. Free Logo Watch E-Sample! We make it easy. Jewelry-quality logo watches for any budget. ]

Selco Custom Time Corporation - Offers customized watches and clocks for promotional purposes or employee incentives.

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