Final answer:
If boilers are operated by unlicensed or improperly licensed persons, they should not be used until the operators are properly licensed.
Step-by-step explanation:
In the context of boiler operation, if it is found that the boilers are operated by unlicensed or improperly licensed persons, they should not be used until the operators are properly licensed.
This is in order to ensure the safety and proper functioning of the boilers. Licensing requirements for boiler operators vary depending on the jurisdiction and the specific type of boiler being operated.