Associated R100A Battery Charger

Does anyone know where to find a manual or information on an Associated R100A With Alternator Protection battery charger? I picked this one up and was going to restore it but it works perfectly. With a little cleaning it looks pretty good so I'm going to leave as is with all of its history showing. If it could only talk! It is all original including the decals and factory inspection sticker on the back.
Attached Images R100A Battery Charger.jpg (49.4 KB) R100A Control Panel.jpg (65.0 KB) #GeneralToolDiscussion