Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W7SWM callsign genealogy
Currently held by Muller, Stephen
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by W7SWM's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held W7SWM.
No current licensee on record previously held this callsign.