Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WH7C callsign genealogy
Currently held by Umemura, Kazuhiro
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 WH7C's current licensee, walking backwards.
- Umemura, KazuhiroHIgranted 2010-02-19cancelled 2010-09-10
Successor callsigns
Callsigns held now by people who previously held WH7C.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WH7C, oldest first.
- TAMAKI, MITSUYA HI1998-08-19 → cancelled 2010-08-20
- Umemura, Kazuhiro HI2020-07-07 active