Flying has always been a dream of humans, and Leonardo's fascination with birds and flight was evide…

One of the most common types of bridges for freight trains, our Truss Design Lift Bridge is a workin…

The Siege Tower was use by invading armies to breach the walls of the castle they were attacking. Th…

Originally invented by the Greeks∗ over 2000 years ago and widely used by the Romans in battles and …