Tubular pin tumbler lock - Design. 1  The design of a tubular lock is similar to the pin tumbler lock, in that there are several stacks of pins. The key is a cylinder shape with notches cut around the outer or (rarely) inner edge. Each of these notches depresses a single pin inside the lock to a specific height allowing the lock cylinder to turn freely.
With more than 31,000 retail locations and the most frequently visited website in the federal government, usps.com, the Postal Service has annual revenue of more than $65 billion and delivers nearly 40 percent of the world's mail.
Postage Rates to Increase in January. The US Postal Service has announced that as of January 27, 2013, the cost to mail first class letters, postcards and packages within the US will go up. The cost to mail a first class letter will be 46 cents, while the cost to mail a postcard will be 33 cents, an increase of 1 cent for each. This is the third increase for postcard postage in less than two years; in April 2011, the USPS boosted the postcard stamp price from 28 cents to 29 cents, and from 29 cents to 32 cents in January 2012.