Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB0CDO callsign genealogy
Currently held by OSBORNE, CLEMENT D
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 KB0CDO's current licensee, walking backwards.
- OSBORNE, CLEMENT DCOgranted 2014-06-26cancelled 2014-07-15
Successor callsigns
Callsigns held now by people who previously held KB0CDO.
- OSBORNE, CLEMENT DCOgranted 2024-01-26
All historical holders
Every license row we've seen with the callsign KB0CDO, oldest first.
- WILLIAMSON, CHARLES G MO1988-07-19 → cancelled 2000-07-20
- OSBORNE, CLEMENT D CO2014-07-15 → cancelled 2024-01-26