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@sysop408 @kwayk42
tl;dr The manufacturing process for making layers of things in rolls was already well-established for other things. Now even more so, so there's not any real incentive to retool for something else.
Apparently this: https://onlinelibrary.wiley.com/doi/10.1002/9781119163824.ch1
(Says a PBS article I found.)
Huh. So 9V batteries are _actually_ batteries!
M