Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB1OSO callsign genealogy
Currently held by PINNEY JR, WILLIAM B
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 KB1OSO's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KB1OSO.
No current licensee on record previously held this callsign.