That was MTAFs. MBZs were later. Then they were all CTAFs but were still a zone. Then some of the CTAFs become manatory zones. A little G demo thrown in there. At the same time CTAFs became a concept, not thing. Then Dick's biscuits took over. Then Dick's biscuits were removed. Now we have what I am going to guess will be called ETAFs (the mandatory broadcast zones in E airspace).
Um, what was the question again? This is all sounding like a bad dream, a bad dream like EUORVISION which is on tonight OMG!!!!