I (just a humble listener mind you) was one of the very first people to ever use the then new identitifier of "95.5" instead of "95 1/2" on air.I just noticed a bit of pre-digital radio trivia: the FM was shown as "94 1/3"!
I think it was 1985 and I called in and was allowed to announce the next song at about 7:00 am on the very morning they made the change. This was on Shana's morning show and the song was (one of my favorites) "Happy" by the Rolling Stones. They repeatedly told me to make sure I said 95.5 instead of 95 1/2 since it was so new.