Dave. thank you for doing this !! 1) shows no one is an expert. 2)shows that nothing is text book.
I agree some items / parts were made by that company or a specific supplier.
it's like seeing posted photos or heer or luftwaffe daggers get picked apart ,because it's not text book. YET, the book(s) sighted only cover half or 1/3 of the total companies that made that item

I will not take this challenge , as I know better.
plus we all know SS daggers were under contracts year to year.
no one knew if next year they would get a contract , so why buy 1 million rune devices for this years' 5,000 dagger contract ?

also ,these "expert" books do show companies buying parts from each other from time to time.
Again thanks dave. jeff