Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9OSU callsign genealogy
Currently held by Kuzel, James J
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 K9OSU's current licensee, walking backwards.
- Friedemann, James TOKgranted 2024-11-05cancelled 2025-01-07
Successor callsigns
Callsigns held now by people who previously held K9OSU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9OSU, oldest first.
- Kuzel, James J IL2010-07-17 → cancelled 2022-07-19
- Friedemann, James T OK2025-01-07 active