221(g) Case Number mentioned as >>> 2017 xxx xxx 1/2/3/4, what is 1/2/3/4?

on my 221(g) form the Case Number mentioned as >>> 2017 xxx xxx 1/2/3/4, what is meant by “1/2/3/4”?

is the case number just “2017 xxx xxx” or it should include “1/2/3/4”?

can someone please help me here?

Can someone please help me out here?

Hi
Did you figure out ,what the 1/2/3/4 means . What is the case number actually.