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The electric clock market grew rapidly in the 1930s, and Telechron's patented power interruption indicator gave his clocks an advantage over competing synchronous clocks, but by the 1950s battery-operated clocks that weren't dependent on the power grid took market share, and in the 1960s the quartz clock replaced synchronous clocks.
Synchronous motor clocks are rugged because they do not have a delicate pendulum or balance wheel. However, a temporary power outage will stop the clock, which will show the wrong time when power is restored. Some synchronous clocks (e.g. Telechron) have an indicator which shows if it has stopped and restarted.
The Hammond Clock Company was founded in 1928 to produce and market clocks that were equipped with Hammond's new motor. The Hammond clock factory manufactured more than 100 different clock models, some simple and cheap, others made from expensive materials such as marble and onyx. [ 4 ]
Circuit City Corporation, Inc., formerly Circuit City Stores, Inc., is an American consumer electronics retail company, which was founded in 1949 by Samuel Wurtzel as the Wards Company, operated stores across the United States, and pioneered the electronics superstore format in the 1970s.
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The words "Kit-Cat" were added to the clock's face in 1982. The original clocks were AC-powered, but due to scarcity of American-made AC motors, the clock was redesigned for battery power in the late 1980s. [3] The manufacturer estimates that an average of one clock has been sold every three minutes for the last 50 years. [4]
Mechanical clocks must be wound periodically, usually by turning a knob or key or by pulling on the free end of the chain, to store energy in the weight or spring to keep the clock running. In electric clocks , the power source is either a battery or the AC power line .
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