Compression spring is a kind of spiral spring,which bears inward pressure. The section of raw material usually is circle,and sometimes is
rectangle. The compression springs have the equal pitch. The compression springs have many shapes,such as cylinder,cone,convex,concave and non-circular and so on. The compression springs have a certain gap between coils. When the spring bears the load,it can contract distortion and store energy.
Compression Spring,Stainless Steel Compression Springs,Heavy Duty Compression Springs,Compression Coil Springs Changyi Precision Spring Co.,Ltd , http://www.cps-spring.com
Apple store new anti-theft device
Apple store new anti-theft device 
Recently, according to foreign media on Wednesday visited several Apple stores and found that Apple is deploying a new type of anti-theft data line, the main deployment area is close to the exit location there is a third-generation iPad. This new type of data cable is not so different from the traditional data cable in appearance, and it has a “lock†logo, which can avoid the theft of a thief without losing the appearance of simplicity. It cannot be removed after it is installed on the i device.