English to Italian Law/Patents Law (general) Business Scope

Scusate, mi sono persa in questa frase... non capisco cosa voglia dire/dove debba essere collegato questo "and of and in" nella frase:

To carry on all or any of the business of consultants, engineers, manufacturers, installers, maintainers, designers, suppliers, repairers of and dealers in air-conditioning, engineered systems, equipment, components, ventilating, mechanical, fire precaution, plumbing, commercial and industrial applications, electrical and electronic appliances and apparatus of every description, *and of and* in air-conditioner, ventilator, radio, television and telecommunication requisites and supplies, and fire precaution, plumbing, electrical and electronic apparatus, appliances, equipment, components parts, material and stores of all kinds.

a business of? Ma cosa vuole dire di piu' di quello che ha gia' detto?

Grazie