Wondering if it's possible to buy stock from Rosenbauer International on the Vienna Market?

With the world seemingly burning down I figured it would be a smart investment to invest in something that produces fire equipment. Rosenbauer International is the number one international seller of fire fighting vehicles, and equipment. They even have a division here in the USA called Rosenbauer America. The stock is listed on the Vienna Stock Exchange with the ticker symbol ROS.VI . The thing is I can't seem to find that it's possible to purchase the stock anywhere. I'm based in the USA, and my father has a Fidelity account. Although Fidelity says it allows trading on international markets, including the Vienna Exchange, when we search for Rosenbauer's stock it just doesn't come up. I'm thinking from all the websites I've seen that show the stock evaluation over time, that all the stocks may be held by people in the company, and it is not actually sold outside of the company on the exchange, since I can't find anywhere to buy the stock, but really I'm not sure as I've never done any international investments. If anyone knows of an online broker that makes it possible to buy stock in the company I'd appreciate the info.

I'd also be interested to know of any other publicly traded companies, or publicly traded parent companies that own companies that make fire fighting equipment. So if any of you know of any companies like that, that I can invest in, I'd love to have that information as well. Although I'm mostly just looking to have my first question answered.

Thanks for reading, and thanks for any information or advice on the subject.