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..
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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.
Inca's
A quipu was used by the Inca civilization as a system of record-keeping and communication. It consisted of colored, knotted strings that conveyed numerical and other information through the position, color, and type of knots. Quipus were used to keep track of population data, tax records, and other administrative information.
Catherine Mutz has written: 'Quipu' -- subject(s): Incas, Quipu, Antiquities
They used a group of knotted strings called a quipu. The varying knots in a quipu represented different place values, making it easy to count crops or populations or anything that could be numbered in this way.
Quipu (kwee-pu) a string that the Incas used to record information.