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2. Electric watch - Wikipedia

   en.wikipedia.org/wiki/Electric_watch

   The Hamilton Watch Company would be the first to produce and retail an electric watch beginning in 1957, before the commercial introduction of the quartz wristwatch in 1969 by Seiko with the Astron. Their timekeeping element was either a traditional balance wheel or a tuning fork, driven electromagnetically by a solenoid powered by a battery.

3. Black Watch (wristwatch) - Wikipedia

   en.wikipedia.org/wiki/Black_Watch_(wristwatch)

   A user operating a Black Watch. The Black Watch is an electronic wristwatch launched in September 1975 by Sinclair Radionics. It cost £24.95 ready-built, but was also available for £17.95, as a kit. [1] These prices are equivalent to around £230 and £160 respectively in 2023, when adjusted for inflation . The Black Watch was supplied with a ...

4. 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 single-cell battery 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. Stainless steel usually forms the bottom body and positive terminal of the cell; insulated from ...

5. Renata (battery) - Wikipedia

   en.wikipedia.org/wiki/Renata_(battery)

   Renata was founded in 1952 by Kurt Zehntner, as a manufacturer of components for mechanical watches and diversified into production of coin or button cells in 1974. Renata was acquired by SMH Swiss Corporation for Microelectronics and Watchmaking Industries Ltd in 1982 (in 1998, SMH became known as The Swatch Group) and produces cells, batteries and associated encapsulation technologies and ...

6. Watch - Wikipedia

   en.wikipedia.org/wiki/Watch

   Watch. A watch is a portable timepiece intended to be carried or worn by a person. It is designed to keep a consistent movement despite the motions caused by the person's activities. A wristwatch is designed to be worn around the wrist, attached by a watch strap or other type of bracelet, including metal bands, leather straps, or any other kind ...

7. HP-01 - Wikipedia

   en.wikipedia.org/wiki/HP-01

   HP-01. The Hewlett-Packard HP-01 is a calculator watch. It was designed and manufactured by Hewlett-Packard (HP). The HP-01 used 7 light-emitting diodes (LEDs)/digit in a 7 digit + decimal point arrangement for its digital display. Introduced in 1977 at the height of the LED watch craze, five models were available, two gold filled models and ...