Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WT0MM callsign genealogy
Currently held by MARSTEIN, THOMAS O
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 WT0MM's current licensee, walking backwards.
- MARSTEIN, THOMAS OVAgranted 2007-01-17cancelled 2007-02-21
Successor callsigns
Callsigns held now by people who previously held WT0MM.
No current licensee on record previously held this callsign.