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Quartz clock. Circuit board of an e block from a chronograph -wristwatch. Quartz oscillator crystal on right. Quartz clocks and quartz watches are timepieces that use an electronic oscillator regulated by a quartz crystal to keep time. This crystal oscillator creates a signal with very precise frequency, so that quartz clocks and watches are at ...
The 24-hour dial has Roman numerals on the outer band and Hindu–Arabic numerals on the inner one. [ 1 ] The history of watches began in 16th-century Europe, where watches evolved from portable spring-driven clocks, which first appeared in the 15th century. The watch was developed by inventors and engineers from the 16th century to the mid ...
November 1917 ad for an Ingersoll "Radiolite" watch, one of the first watches mass marketed in the USA featuring a radium-illuminated dial. Radium was discovered by Marie and Pierre Curie in 1898 [1] and was soon combined with paint to make luminescent paint, which was applied to clocks, airplane instruments, and the like, to be able to read them in the dark.
A SINCGARS is being operated from within a HMMWV. Single Channel Ground and Airborne Radio System ( SINCGARS) is a very high frequency combat-net radio (CNR) used by U.S. and allied military forces. In the CNR network, the SINCGARS’ primary role is voice transmission between surface and airborne command and control assets.
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The leather strap version of the watch (model 69721) was worn by commander William Shepherd during Expedition 1 and cosmonaut Mikhail Tyurin, Expedition 14, on the ISS. Timex Datalink or Timex Data Link is a line of early smartwatches manufactured by Timex and is considered a wristwatch computer. [ 1]
AEC Routemaster. The AEC Regent III RT was one of the variants of the AEC Regent III. It was a double-decker bus produced jointly between AEC and London Transport. It was the standard red London bus in the 1950s and continued to outnumber the better-known Routemaster throughout the 1960s.
The MO-120 RT (factory designator) or MO-120-RT is a French heavy mortar.The RT in the designator stands for rayé, tracté, which means rifled, towed.The MO-120-RT is currently used by the French Army (where it is known as RT F1 or Mortier de 120 mm Rayé Tracté Modèle F1—"120 mm rifled towed mortar, model F1"), and has also been exported to more than 24 foreign countries or in some cases ...