No-one knows. Forms of the drawbridge were used, albeit rarely, as far back as ancient Egypt, 3000 BC. They did not become common until the Middle Ages in Europe. Leonardo da vinci designed some - he is not the inventor though.
the sumerians invented it.
the Egyptian invented the pyramids
USA invented the javelin rocket.
The ancient Summarians invented cuneiform.
they are not invented but used for accesories in India
Drawbridges are usually found on old castles over the moat.
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The Aztecs used a combination of wood, stone, and ropes to build drawbridges. They would create a framework using wooden beams and stone supports, then use ropes to attach the bridge to a mechanism for raising and lowering it. These drawbridges were commonly used in their cities to span canals and waterways.
For over 8,000 years ago they have been in use in some form.
Castles over a moat.
Drawbridges are made to allow boats to pass underneath while still maintaining a pathway for pedestrian and vehicular traffic. They are designed to rise up or swing open to create a gap for taller vessels to navigate through.
Hydraulic systems may be used to open and close drawbridges.
Castles had drawbridges to allow some people inside, usually by providing a bridge to get over a moat or ditch. Drawbridges could be brought up to keep other people out, such as enemies, since they could not get over the moat or ditch without it.
Drawbridges.
A drawbridge (bascule bridge) is utilized where the low clearance of a bridge over a waterway would not allow some ships and boats to pass beneath it. This is most commonly seen on active waterways where a bridge is desirable for traffic, but taller/larger ships and boats MUST pass through. Alternatives to drawbridges include vertical lift bridges, where the middle section can be raised high enough to allow ships beneath it, and swing bridges that can pivot in the center. Counter-weighted drawbridges, however, are more common, because they were usually cheaper and easier to construct. In many cities with high vehicular traffic, or for interstate highways, drawbridges have been replaced by modern high-rise bridges.
swords, knights, guards, moats, drawbridges, attack weapons etc.
Bernard C. Winn has written: 'From \\' -- subject(s): Social life and customs, Childhood and youth, Biography 'San Francisco underfoot' -- subject(s): Pictorial works, Equipment and supplies, Manhole covers, Public utilities 'California drawbridges, 1853-1995' -- subject(s): Drawbridges, History 'Railways revisited' -- subject(s): Railroads