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A keychain (/ ˈkitʃeɪn / ⓘ) (also key fob or keyring) is a big ring or chain of metal to which several keys can be attached. The length of a keychain allows an item to be used more easily than if connected directly to a keyring. Some keychains allow one or both ends to rotate, keeping the keychain from becoming twisted, while the item is ...
Clockspring. A plastic clock spring. Note that tension is created when it is "wound", or the end is rotated about the center. A clockspring (also referred to as spiral spring or spiral cable) [1] is a type of spring often found in automobiles, that stores energy on a rotating axis. Clocksprings generally consist of a flat multicore cable wound ...
The first clock known to strike regularly on the hour, a clock with a verge and foliot mechanism, is recorded in Milan in 1336. [96] By 1341, clocks driven by weights were familiar enough to be able to be adapted for grain mills, [97] and by 1344 the clock in London's Old St Paul's Cathedral had been replaced by one with an escapement. [98]
A remote control for a keyless entry system built into an ignition key: pressing a button on the key unlocks the car doors, while another button locks the car and activates its alarm system. A remote keyless system (RKS), also known as remote keyless entry (RKE) or remote central locking, is an electronic lock that controls access to a building ...
Zenith SA is a Swiss luxury watchmaker. The company was started in 1865 by Georges Favre-Jacot in Le Locle in the canton of Neuchâtel [1] and is one of the oldest continuously operating watchmakers. Favre-Jacot invented the concept of "in house movements", believing that only through control of the entire watchmaking process could the highest ...
In essence, the maintaining power consists of a disc between the driving drum of the clock and the great wheel. The drum drives the disc, and a spring attached to the disc drives the great wheel. The spring is selected to be slightly weaker than the driving drum, so in normal operation it is fully compressed. When the pressure from the drum is ...
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