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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.
A wheel hub with a castellated nut secured in the center using a cotter pin to prevent it from unscrewing. A positive locking device is a device used in conjunction with a fastener in order to positively lock the fastener.
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The Dainese Technology Center (D-Tec) develops protection and apparel-related technologies for the group companies and other applications. The company has registered 118 patents. [24] In MotoCAP's independent safety research, various Dainese products – such as the Avro 4, Prima72 and Fighter jackets – have achieved high test scores. [25]
Lock and key, a mechanical device used to secure items of importance; Lock (firearm), the ignition mechanism of small arms Lock (water navigation), a device for boats to transit between different levels of water, as in a canal
The hole is an oval 4.9 in (124.5 mm) on the long axis with two flat sides 2.5 in (63.5 mm) apart. The male component is the twistlock, which is fitted to cranes and transport bases. This can be inserted through the hole (it is roughly 4.1 in or 104.1 mm long and 2.2 in or 55.9 mm wide), and then the top portion (normally pointed to make ...
A BiLock padlock. Bilock is a high-security keying system designed and manufactured by Australian Lock Company. It is advertised to be bump-proof, pick-resistant, and drill-resistant.
A split pin, also known as a cotter pin, or cotter key in the US, [1] is a metal fastener with two tines that are bent during installation, similar to a staple or rivet. Typically made of thick wire with a half-circular cross section, split pins come in multiple sizes and types.