Hall Research ( U97-Ultra Receiver) and PH211-2S (U97-Ultra Sender)

Hall Research Inc. U97-Ultra Sender Console Extender

Hall Research Inc. U97-Ultra Receiver Console Extender

AMREX SYNCHROSONIC U/50 ULTRA SONIC-TURNS ON-TRULY UNTESTED-SEE DESCRIPTION

HALL RESEARCH, PH211-2S, U97- ULTRA SENDER CONSOLE

Hall Research PH210-2R (U97-Ultra Receiver) and PH211-2S (U97-Ultra Sender)