may be some periods of working on the client s site surveying existing equipment , and installing and commissioning systems
O O O O O O O O O O O B-SKILL I-SKILL I-SKILL O O B-SKILL I-SKILL I-SKILL I-SKILL
MD VB DT NNS IN VBG IN DT NN VBZ NN VBG VBG NN , CC NN CC VBG NNS