Doncha just love that? You go into some of these old panels and you don't dare touch the wires for fear that the masking tape lables will disintegrate to mear flakes and you'll have to buzz out the entire job.
The soulution? You take each wire, one by one, VERY very carefully ....... read the lable ( if you can) write the description on a NEW piece of masking tape and there ya go. Good for another few years or so.
GAWD! ...... You'd think they'd come back more often to change the tape .....Right? ..... SIGH!
Me? I don't have none of that. .... Ya gotta use something that lasts a long long time. It takes up alot of space and it's hard to get off the roll, but ....... I use duct tape.