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2. Telechron - Wikipedia

   en.wikipedia.org/wiki/Telechron

   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.

3. Electric clock - Wikipedia

   en.wikipedia.org/wiki/Electric_clock

   These keep time by counting the oscillations of a calibrated tuning fork with a specific frequency. These were only made in battery-powered form. Battery-powered clocks have been made using the schemes above with the obvious exception of a synchronous movement. All battery-powered clocks have been largely replaced by the lower cost quartz movement.

4. Digital clock - Wikipedia

   en.wikipedia.org/wiki/Digital_clock

   Digital clocks typically use the 50 or 60 hertz oscillation of AC power or a 32,768 hertz crystal oscillator as in a quartz clock to keep time. Most digital clocks display the hour of the day in 24-hour format; in the United States and a few other countries, a commonly used hour sequence option is 12-hour format (with some indication of AM or PM).

5. Quartz clock - Wikipedia

   en.wikipedia.org/wiki/Quartz_clock

   In most clocks, the resonator is in a small cylindrical or flat package, about 4 mm to 6 mm long. [6] The 32 768 Hz resonator has become so common due to a compromise between the large physical size of low-frequency crystals for watches and the larger current drain of high-frequency crystals, which reduces the life of the watch battery.

6. Clock - Wikipedia

   en.wikipedia.org/wiki/Clock

   The electric clock was patented in 1840, and electronic clocks were introduced in the 20th century, becoming widespread with the development of small battery-powered semiconductor devices. The timekeeping element in every modern clock is a harmonic oscillator , a physical object ( resonator ) that vibrates or oscillates at a particular ...

7. Stanley recalls 2.6 million mugs after reports of burns from ...

   www.aol.com/stanley-recalls-2-6-million...

   Stanley is recalling 2.6 million mugs sold in the U.S. after the company received dozens of consumer complaints, including some users who reported getting burned and requiring medical attention ...