Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WD4SLM callsign genealogy
Currently held by Krone, Douglas 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 WD4SLM's current licensee, walking backwards.
- Krone, Douglas EWAgranted 2010-03-08cancelled 2016-02-06
Successor callsigns
Callsigns held now by people who previously held WD4SLM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WD4SLM, oldest first.
- KRONE, EDWARD H TN1996-11-21 → cancelled 2008-11-22
- Krone, Douglas E WA2026-01-21 active