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Transcript of Construction: Saw
Saws and blades
first one:Stone saws set into handle also blade were made of copper and stone
Improvement:Stronger blades also narrower,made with iron and copper
Present day:High speed blades
Invention Technology Evolution
The society need a saw to make log cabin for the winter,cut trees ,cut car doors for car accident
The society wants a saw to cut bushes and make stuff like skateboards,paper,pencil and etc
Society wants and needs
To cut wood and other thing
Also to build things
use of invention
During the Chun Qiu