John holt unveils new fire fighting equipment

I apologize, but I couldn't find any information on a person named John Holt unveiling new firefighting equipment. It's possible that you may have misspelled the name or that this is a fictional event.

If you could provide more context or clarify who John Holt is, I may be able to help you better. Alternatively, if you're looking for information on new firefighting equipment, I can try to provide you with some general information on the latest advancements in firefighting technology.