Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB7OLZ callsign genealogy
Currently held by Knowlton, Craig 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 KB7OLZ's current licensee, walking backwards.
- Knowlton, Craig FWAgranted 2009-11-18cancelled 2009-12-11
Successor callsigns
Callsigns held now by people who previously held KB7OLZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB7OLZ, oldest first.
- KNOWLTON, CRAIG F WA1994-04-12 → cancelled 2006-04-14
- Knowlton, Craig F WA2019-10-25 active