I am seriously stuck on o45. I have gotten the area of the blue rectangle, I've looked up the subclass but it doesn't mean anything to me. I keep searching for relations to tennis or other words for the sublcass but I can't get anywhere. If I just type in the number I get a CBNC. What am I doing wrong?
This one was misleading. You probably have what you need to solve it. Enter us patent number, subclass the number you get CBNC.
The answer is two words, not a number.