Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K7OSQ callsign genealogy
Currently held by LINDENAU, WILLIAM F
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 K7OSQ's current licensee, walking backwards.
- LINDENAU, WILLIAM FIDgranted 2012-12-08cancelled 2012-12-27
Successor callsigns
Callsigns held now by people who previously held K7OSQ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K7OSQ, oldest first.
- LINDENAU, RICHARD D WA1996-12-31 → cancelled 2009-01-01
- LINDENAU, WILLIAM F ID2024-01-09 active