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As its name suggests, the easiest way to compare key profiles is to look at them from the side. The keyboard profile refers to the profile shapes of each row of keycaps. With different profiles, keys can vary in size, shape, and thickness. When (most) modern key sets vary in profile from row to row, this is called a sculpted profile. [14] [15] [16]
The first known example of a tumbler lock was found in the ruins of the Palace of Khorsabad built by king Sargon II (721–705 BC.) in Iraq. [1] Basic principles of the pin tumbler lock may date as far back as 2000 BC in Egypt; the lock consisted of a wooden post affixed to the door and a horizontal bolt that slid into the post.
As the key slides into the lock through the keyway, the wards align with the grooves in the key's profile to allow or deny entry into the lock cylinder. A traditional pick set. From left to right: torsion wrench, "twist-flex" torsion wrench, offset diamond pick, ball pick, half-diamond pick, short hook, medium hook, saw (or "L") rake, snake (or ...
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The Euro key on a pedestrian crossing in Vienna. Euro key (German: Euroschlüssel) is a locking system which enables people with physical disabilities to access facilities free of charge: [citation needed] for example disabled-accessible elevators and ramps, public toilets on motorways, at train stations, in pedestrian zones, shopping centers, museums, public authorities etc.
An arrow lock is metal and rectangular, measuring 2.005 in × 3.566 in × 0.620 in (50.9 mm × 90.6 mm × 15.7 mm) with a keyhole in the center. [2] When the user turns the key, a metal bar that normally protrudes from one side is moved through the lock to the other side.
It is a lock key, like Caps Lock and Scroll Lock. Its state affects the function of the numeric keypad commonly located to the right of the main keyboard and is commonly displayed by an LED built into the keyboard. The Num Lock key exists because earlier 84-key IBM PC keyboards did not have cursor control or arrows separate from the numeric ...
Percussion caps have been manufactured in various sizes to fit snugly over different sized nipples. Nipples for 4.5mm and 6mm percussion caps. The percussion cap, percussion primer, or caplock, introduced in the early 1820s, is a type of single-use percussion ignition device for muzzle loader firearm locks enabling them to fire reliably in any weather condition. [1]
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