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establishment, mining plant, shaft, tunnel, caisson, trench, excavation, highway, railway, street, runway, (...) clearing, earth moving, grading, excavating, trenching, digging, boring, drilling, blasting, or concreting

(a) digs, bores, trenches, grades, excavates, moves or breaks earth, rock

Scaffolding, trenches, safety devices (...) Scaffolding, trenches, safety devices (...) regulate the excavating, construction and use of trenches;