How to make perforation on films?

[Whr]

Hello everyone, I found a perforated Kodak 2468 on an e-commerce platform in China. Generally speaking, Kodak 2468 film does not have perforations. I wonder how this perforation is made.

examples

Contrast perforated film with unperforated film

135 Kodak 2468 black and white film
film kodak black and white reflection film red film base sensitivity ISO 0.8, moderate contrast, rich layers, 40 counting sub-packing, D76 development about 15 minutes directly positive, has uploaded the sample

I'm sorry, because it was translated by the translator, some words may be inaccurate

[philslizzy]

I wouldn't think it would be too difficult to make a perforating machine. I made one for APS on my kitchen table