Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K7OSU callsign genealogy
Currently held by DEAL MR, MICHAEL W
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 K7OSU's current licensee, walking backwards.
- Schaaf, John RORgranted 2013-12-27cancelled 2014-01-14
Successor callsigns
Callsigns held now by people who previously held K7OSU.
- DEAL, MICHAEL WWAgranted 2009-01-10cancelled 2010-10-22
All historical holders
Every license row we've seen with the callsign K7OSU, oldest first.
- DEAL MR, MICHAEL W WA2008-01-25 → cancelled 2009-01-10
- Schaaf, John R OR2024-01-18 active