An Unlocking History Research Group team member holds a rare unopened example of a letterpacket with a paper lock. (Unlocking History Research Group) Hundreds of years ago, before the invention of ...
Over recent years we’ve been treated to a series of fascinating advances in the world of x-ray imaging, as researchers have developed their x-ray microtomography techniques and equipment to the point ...
Keys: How to Use this Book -- Introduction to Letterlocking -- Building the Story of Letterlocking -- Reading Letterlocking Features -- Locking Mechanisms, Security, and Authentication -- Distinctive ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback