From what I know, they break out the communications section like this:
384.3 Computer communication
384.5 Wireless communication
And I think they put Morse code under Telegraph.
If that is the case, I can't help but protest and say that Morse code is not limited to land-line telegraph. It has also been a wireless tool since the first decade of the 20th century. In fact, the code can also be sent using light. Now, perhaps they have a separate entry for these other media by which Morse code can be sent, but I have no way of knowing for sure.
Ok, now when people ask me what I do for a living, I will point to this entry.
I make classification systems for a living.
And I must say, they are a lot easier to make when you know the domain really well.