I believe that the Registered PATCO Logo should be used as the standard for establishing this matter. It is very clear they are an independent union established in 96, and not affiliated with a dental union/afscme. The logo as shown on AFSCME is not the one used by the strikers in 81 and has no history attached to it. Most strikers still belong to the PATCO Registered union, and not the other.
my two cents