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A metal roof is a roofing system featuring metal pieces or tiles exhibiting corrosion resistance, impermeability to water, and long life. It is a component of the building envelope . The metal pieces may be a covering on a structural, non-waterproof roof, or they could be self-supporting sheets.
Swedish snaplock gun from the early 16th century. The origin of this proto-flintlock is unclear. The earliest source which could be speaking of a snaplock is an account from 1515 where a young man in Konstanz, Germany accidentally shot a girl with a pistol, thinking it could not go off due to the lack of a lit match.
A snap shackle spliced to a line. As the name implies, a snap shackle is a fast action fastener which can be implemented single-handedly. It uses a spring-activated locking mechanism to close a hinged shackle, and can be unfastened under load. This is a potential safety hazard, but can also be extremely useful at times.
The same physical principles are involved in lock bumping, but the snap gun automates the transfer-of-energy process. A correctly applied snap gun can open a lock very quickly compared to traditional lock picking, but the sharp impact is more likely to damage the lock mechanism than raking, which mimics normal key movements.
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Snap-together connectors have been used for thousands of years. The first ones were metal. Some of the oldest snap-fits found are snap fasteners, or buttons, shown on the Chinese Terracotta Army featuring soldiers from the late Warring States period. Metal snap fasteners, spring clips, and other snap-type connectors are still in broad use today.
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