42 Engineering services in the field of telecom structures, substation design, substation construction, layout and site design, substation control building design and construction, transmission line structure design, transmission line tower foundation design and construction, and overhead transmission line design and construction.; Engineering design services; Engineering design services in the field of telecom structures, substation design, substation construction, layout and site design, substation control building design and construction, transmission line structure design, transmission line tower foundation design and construction, and overhead transmission line design and construction; Structural engineering design services; Consulting in the field of structural engineering