Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4USR callsign genealogy
Currently held by DIEGMUELLER, MARVIN E
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 K4USR's current licensee, walking backwards.
- DIEGMUELLER, MARVIN ENCgranted 2015-07-29cancelled 2016-09-02
Successor callsigns
Callsigns held now by people who previously held K4USR.
No current licensee on record previously held this callsign.