, earth tampers, cement mixers, small mechanical hoists, surveying and measuring equipment, and a variety of other equipment... and instruments May clean and prepare sites, dig trenches, set braces to support the sides of excavations, erect scaffolding, clean...
operate hand and power tools of all types: air hammers, earth tampers, cement mixers, small mechanical hoists, surveying... and measuring equipment, and a variety of other equipment and instruments. May clean and prepare sites, assist craft workers...