I have been presented with an old MultiBlitz IIIb flash unit from 1964. It seems to be in working order, but I don't yet entirely understand it. For example, there are 5 connector sockets, where probable at least two of them are to be used as trigger connectors. And there's a second, smaller block beneath the power house, where I would expect a battery unit, that contains similar power electronics with a really huse capacitor as the main power unit. I have no clue yet how this is supposed to cooperate with the main unit other than how to connect it physically. Therefore I am quite desperately looking for the original manual, or a copy of it. There are pics of it at Pinterest's, but they don't lead me to the text. Would anyone here have a tip where to look for it?