Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K7OOS callsign genealogy
Currently held by Mardock, Harold C
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 K7OOS's current licensee, walking backwards.
- Mardock, Harold CORgranted 2003-04-22cancelled 2004-10-01
Successor callsigns
Callsigns held now by people who previously held K7OOS.
No current licensee on record previously held this callsign.