Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W1OSH callsign genealogy
Currently held by Mook, Michael R
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 W1OSH's current licensee, walking backwards.
- Mook, Michael RWAgranted 2014-03-26cancelled 2014-04-15
Successor callsigns
Callsigns held now by people who previously held W1OSH.
- Mook, Michael RCAgranted 2016-05-06