Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W9GRM callsign genealogy
Currently held by Grim, Hans P
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 W9GRM's current licensee, walking backwards.
- Grim, Hans PTXgranted 2021-01-11cancelled 2021-01-29
Successor callsigns
Callsigns held now by people who previously held W9GRM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W9GRM, oldest first.
- MARCUM, GARY R IL2000-08-26 → cancelled 2012-08-28
- Grim, Hans P TX2021-01-29 active