The first person 
		to describe the spiral was the Greek scientist Archimedes (approximately 
		287 BC-212 BC). The Archimedes spiral is a huge spiral in a wooden 
		cylinder, used to raise water from one level to another, and irrigate 
		the field. But the real inventor was not Archimedes himself. He just 
		described something that already existed. Maybe it was designed by 
		skilled craftsmen in ancient Egypt for irrigation on both sides of the 
		Nile.
 
		In the Middle 
		Ages, carpenters used wooden or metal nails to connect furniture and 
		wooden structures. In the 16th century, nail workers began to produce 
		nails with spiral threads. These nails can connect things more firmly. 
		This is a small step from this type of nail to a screw.
		Around 1550 AD, 
		the first metal nuts and bolts that appeared as fasteners in Europe were 
		all hand-made on simple wooden lathes.
		Screwdrivers 
		(spins) appeared in London around 1780. Carpenters have found that 
		tightening screws with a screwdriver can fix things better than hitting 
		with a hammer, especially when encountering fine-grained screws.
		In 1797, Mozley 
		invented an all-metal precision screw lathe in London. The following 
		year, Wilkinson made a nut and bolt manufacturing machine in the United 
		States. Screws were quite popular as fixing parts because at that time a 
		cheap production method had been found.
		In 1936, Henry 
		M. Philips applied for a patent for the cross recessed nail head screw. 
		This design makes the screwdriver center automatically and is not easy 
		to slip off, so it is very popular. Universal nuts and bolts can connect 
		metal parts together. Therefore, in the 19th century, the wood used to 
		make machines to build houses could be replaced by metal bolts and nuts.
		In the future, 
		the fastener industry will become more and more formal, and the 
		threshold for entrepreneurship will be higher and higher. In the future, 
		there will be some large-scale enterprises in the industry, the number 
		of small and medium-sized enterprises will be greatly reduced, and the 
		industry concentration will continue to increase.