This Chapter shall not prevent the following activities:
8. (ii) the performance of internal engineering or survey work by amanufacturingor communications common carrier company, or by a research and development company, or by employees of those corporations provided that the work is in connection with, or incidental to products of, or nonengineering services rendered by those corporationsor their affiliates.9. The routine maintenance or servicing of machinery, equipment, facilities or structures, the work of mechanics in the performance of their established functions, or the inspection or supervision of construction by a foreman, superintendent, or agent of the architect or professional engineer, or servicesof an operational nature performed by an employee of a laboratory, a manufacturing plant, a public service corporation, or governmental operation.