Pretty sure they were known by what you mentioned there. I used to have an early model 45 panel which was quite basic bit still quite a lovely panel. I have one of those plastic things that goes on the key switch if you want it? To get that 41a working again
I have just noticed that the keyswitch is missing the plastic arm that pushes the Microswitch in, and that also allows the solenoid to lock the key switch
memories had a set of walkie talkies and sat one ontop of the speaker triggered doing the walk test
beep lim z1 beepbepp lim z2 god im getting old
just a nightmare popping back to the panel to restart a new lim
had a few jobs with about 10-15 lims on glad there gone