What happens to a lower grade of Commercial Radiotelegraph License when a licensee qualifies for a higher grade?
The lower grade is allowed to expire and may not be renewed
The Second or Third Class Radiotelegraph license is modified to a higher class
The lower grade is canceled. Only one unexpired radiotelegraph operator's certificate may be held at the same time
Licensees are permitted to hold any number of radiotelegraph operator certificates at the same time
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