Cam Cover differences

#1
Just curious, I've noticed different wordings on the 4G63 Cam Cover. Can someone clarify:

It seems that:
Before EVO 8: It says "DOHC 16 Valves"
EVO 8: 2 straight lines
EVO 9: MIVEC TURBO

There're some that says "EVOLUTION" too

Anyone has a chronological order to it ?