Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KM9H callsign genealogy
Currently held by WIDMAR SR, WILLARD M
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 KM9H's current licensee, walking backwards.
- Semmelmann, SvenAZgranted 2018-07-25cancelled 2020-11-10
Successor callsigns
Callsigns held now by people who previously held KM9H.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KM9H, oldest first.
- WIDMAR SR, WILLARD M WI2008-07-11 → cancelled 2020-10-10
- Semmelmann, Sven CA2020-11-10 active