William S. Otis, of the firm of Carmichael, Fairbanks and Otis, when living in Canton, Massachusetts in 1834 and 1835, while his firm was performing grading work for the Boston & Providence Railroad built the first steam excavator – a steam shovel.
Front shovels are used predominately for hard digging above track level and for loading haul units.
Loading of shot rock would be a typical application.
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دانلود پاورپوینت SHOVELS