Anyone know how a top-cut hotdog bun factory works?

Insomnia got the better of me last night and I started thinking about New England style hot dog buns, and how you never see the end rolls- the ones that have one brown side as well. That in turn got me thinking about the factory process, and now I'm really curious.

Anyone have any idea how factories make these, or better yet, know of one of those tour-type videos of this type of factory?

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