Williams Sound, Stereo Receiver, models:

PPA R19-6	Specifications
PPA R751	Specifications
PPA SelectView R38	Quick Step Manual
Personal PA Receiver PPA R19	Specifications
Personal PA Wideband Receiver PPA R7-4NA	Specification Sheet
Personal Receiver R1-173	Instructions For Use And Care
Receiver WIR RX14-2	Instructions For Use And Care
Receiver WIR RX16	Instructions For Use And Care Manual
SoundPlus Infrared System WIR SYS 90V	Specification Sheet
SoundPlus Value Courtroom System WIR SYS 2	Specification Sheet