Has anyone ever heard the LA CA Allertors/Mobile-Directos. I want to know which port they were 10/12 or 9/12 like the 500T's as ACA Used Federal rotors/Stators in 10/12 port in there sirens made in the 50's and early 60's.
late 60's early 70's ACA used 8/12 and than around 1973 it was 9/12
the 8/12 & 9/12 were made by ACA