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Padlock. Typical modern padlock with keys. Padlocked door. Padlock in the Mayenne Castle Museum (France) Padlocks are portable locks usually with a shackle that may be passed through an opening (such as a chain link, or hasp staple) to prevent use, theft, vandalism or harm .
Wrought iron. Wrought iron is an iron alloy with a very low carbon content (less than 0.05%) in contrast to that of cast iron (2.1% to 4.5%). It is a semi-fused mass of iron with fibrous slag inclusions (up to 2% by weight), which give it a wood-like "grain" that is visible when it is etched, rusted, or bent to failure.
Gate of the Winter Palace in St Petersburg. Ironwork is any weapon, artwork, utensil, or architectural feature made of iron, especially one used for decoration. There are two main types of ironwork: wrought iron and cast iron. While the use of iron dates as far back as 4000 BC, it was the Hittites who first knew how to extract it (see iron ore ...
Dog (engineering) In engineering, a dog is a tool or part of a tool, such as a pawl, that prevents or imparts movement through physical engagement. [ 1] It may hold another object in place by blocking it, clamping it, or otherwise obstructing its movement. Or it may couple various parts together so that they move in unison – the primary ...
Doors excavated from Lake Nemi and dated to around 1st century CE feature knob-shaped handles. [9] In Asia, China by the 4th century CE was producing a range of automated doors, door locks and door bars. [10] There is little record of door handle development between the Fall of Rome and about 1000 CE.
An ironmonger's shop in France, with iron goods and other consumer goods. Ironmongery originally referred, first, to the manufacture of iron goods and, second, to the place of sale of such items for domestic rather than industrial use. In both contexts, the term has expanded to include items made of steel, aluminium, brass, or other metals, as ...
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