Technology connections?

Wait until OP finds out about the aux cable.

Not surprising in the least. 120 format was first introduced in 1901 and is still around and available, and the common 35mm format is coming up on a century (first released in 1934.) And that's if you just look at Kodak. Fujitsu still makes limited runs of 101, which Kodak discontinued in the 1950's for use in medium format cameras.

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I doubt it’s the same product. Virtually all film back then was nitrate, which rapidly declined in use in the post-WWII era because it caught fire so easily.

35mm has been the de facto standard way before 1934. Even early sound-on-film stuff happened before ‘34

He just released a no nut effort november video about a film speed recognition standard for cameras, so OP likely got his other videos about cameras and film recommended.

Whoa, tell us more

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It's the cartridge roll film format which is the same, not the film itself.

There is a link to the 120 film page in this article, that says 120 film has been in use since 1901, and 120 film is way more common and popular than 127 film.

Plus-X was the same film but with a coating that allowed the negatives to be retouched. Unfortunately it's no longer available either. It was nice stuff.

Kodak still makes T-Max 100 in 120 size.

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No doubt. Should have been clearer by saying Kodak 135 format instead of just 35mm, especially considering (as you said) there are other 35mm formats.