Earthmoving machinery, excavation, shovel, pushing or leveling machinery such as soil and sand. Widely used in construction, water conservancy construction, road construction, airport construction, mining, dock construction, farmland improvement and other projects. The earliest earthmoving machinery was powered by human or animal power. The emergence of steam engines in the 18th century made various earthmoving machinery come out one after another. Later, the power was developed from the steam engine to the current gasoline engine and diesel engine. The structure was gradually improved and the performance was improved.
surveyor outside steel measuring tape
4x Retraction Measuring Tape,50m Retraction Measuring Tape,Survey Tape Measure
Shangqiu Acer Measuring Tool Co.,Ltd. , https://www.acertoolshn.com