40 Manufacture to the specification of others of equipment for bulk materials loading, personnel safety access and fall protection, namely, canopies, bulk loading stations, towers, spill containment pans, stairs, platforms, loading arms, guardrails, cages, gangways, safety enclosures, crossovers, handrails, and pipe racks; technical consulting services in the field of the manufacture of bulk loading equipment, safety access equipment, fall protection equipment, and industrial steel structures