Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4GLM callsign genealogy
Currently held by TRUMAN, WILLIAM C
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 K4GLM's current licensee, walking backwards.
- Boal III, Ralph SFLgranted 2001-05-04cancelled 2003-06-10
Successor callsigns
Callsigns held now by people who previously held K4GLM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4GLM, oldest first.
- TRUMAN, WILLIAM C OH1988-10-18 → cancelled 2000-10-19
- Boal III, Ralph S FL2023-05-02 active