Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WB4SQM callsign genealogy
Currently held by RICHARDSON, DAVID B
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 WB4SQM's current licensee, walking backwards.
- RICHARDSON, DAVID BSCgranted 2016-07-19cancelled 2019-11-19
Successor callsigns
Callsigns held now by people who previously held WB4SQM.
No current licensee on record previously held this callsign.