One can hold BOTH an "A" and "B" license. Perhaps a power limit less than
1500w.



There actually was a time when you could not have a novice *and* a tech
license
at the same time. Tech required 5wpm then, and general written. And
presumidly
novice written. So Tech would have been a superset of novice, but if
you upgraded
from novice to tech then, you gave up your old HF privs to get on above
50MHz.
This was more likely a brearucratic screw up than actual desired policy.
Like today's
lifetime credit for passing a 5 wpm test but none for 13 or 20.