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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

   Zamboni's clock had a vertical needle supported by a pivot and was so energy efficient that it could operate on one battery for over 50 years. In 1840, Alexander Bain, a Scottish clock and instrument maker was the first to invent and patent a clock powered by electric current. His original electric clock patent is dated October 10, 1840.

4. 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 that vibrates or oscillates at a particular frequency. [2]

5. Hermle Clocks - Wikipedia

   en.wikipedia.org/wiki/Hermle_Clocks

   Hermle manufactures mechanical mechanisms, battery operated mechanisms, accessories such as dial, pendulums, weight shells, and do-it-yourself clock kits as well as finished clocks. Hermle is a manufacturer that sells to the wholesale industry and operates in over 80 countries with offices in Germany and the United States , since 1977, as ...

6. Automaton clock - Wikipedia

   en.wikipedia.org/wiki/Automaton_clock

   In the United Kingdom, Kit Williams produced a series of large automaton clocks for a handful of British shopping centres, featuring frogs, ducks and fish. Seiko and Rhythm Clock are known for their battery-powered musical clocks, which frequently feature flashing lights, automatons and other moving parts designed to attract attention while in ...

7. Button cell - Wikipedia

   en.wikipedia.org/wiki/Button_cell

   Button, coin, or watch cells. A button cell, watch battery, or coin battery is a small battery made of a single electrochemical cell and shaped as a squat cylinder typically 5 to 25 mm (0.197 to 0.984 in) in diameter and 1 to 6 mm (0.039 to 0.236 in) high – resembling a button.