Convoys are used for many things. They can be used to deliver goods to areas that are in need. They can also be used in military regions as protection.
IT is used for probating measurement
Shabtis are used for tombs and putting slaves in
they used iron
Many do not know the exact date it was first used but we do know it has been used years ago.
The invention is Quipu..
The Inca made advances in engineering, art, and medicine.The Inca used a tool called a quipu. The Inca used this tool as a record keeping system. Since they had no system of writing, the quipu was very important.The Inca used the quipu to keep track of trade goods, military troops, and populations in the territory. Another type of quipu helped the Inca recall their history.
the incas used the quipus to keep records
The Inca's used the quipu to record numbers since they didn't have a form of writing. The quipu is a system of strings and knots used to represent numbers so that the Inca's wouldn't have to write down anything.
A Inca Quipu is a string with many knots used to record information as there was no system of writing during the Inca empire. The strings were often colored to represent something.
As a writing system to record information about the ruler
* Quipu or Khipu were recording devices used in the Inca empire. It consisted of coloured spun and plied strings from Illa or Alpaca hair or cotton cords with numeric and values encoded by knots in a base 10 positional system.
They used runners to carry verbal messages. Pictographs as representations. An innovation also used was was a 'Quipu'. Which was a complex set of knotted strings. For more information on Quipu see the link below.
Catherine Mutz has written: 'Quipu' -- subject(s): Incas, Quipu, Antiquities