Drew thank you for posting this wonderful manual. I have one around here somewhere I think, although I don't have any of the pre-1950 mixers, save for the second one they came out with, ivory with green glassware and wooden handle, one of may items which decorates my father's kitchen above the cabinets. I'm almost positive this manual is a pre-war version, although I don't know if the mixer you have is or not. Have you used it at all?
Early on, there was even a special cabinet you could purchase from Sunbeam to properly store your full set of attachments. I have a feeling many of the people that had that much of the set probably had household help. Certainly they would have been in the higher echelons. And all these things you did with the 120 watt motor or whatever it was. This is how I've come to know that the quality of a motor has to have far more to it than its wattage.
I didn't know about the juicer, but while the slicer shredder, meat grinder, and drink mixer (with the addition of the blender) continued with the post 1950 models (10 and above), they are not, for a number of reasons, interechangeable with one another. I sold some attachments on Ebay in the past and was always careful to mention that to people.