Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W1OPA callsign genealogy
Currently held by GRIESEMER, MANFRED 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 W1OPA's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held W1OPA.
No current licensee on record previously held this callsign.