Right! I too am amazed at the their ability to effectively use these muti-imaging systems. From what I have read, they were quite efficient.
Originally Posted by Konical
Your 1970's account is the latest I have heard of anyone using multi-exposure backs. I have a few studio cameras with sliding backs for multiple exposures on 5x7 and 8x10 film -- these cameras are from the 1920's and 30's. I had a back for my Deardorff that supported at least two exposures on 5x7. You're the first of anyone I've talked to who has accounted any real use of these backs though.