Dear colleagues, I want to know which country has the Simplex system, and I thank you very much
Simplex is headquarted in the US (to be more specific: Westford, Massachusetts).
However, its products are also available many other jurisdictions, including Canada and several Middle Eastern countries, as well as Australia.
Simplex is most commonly found in America
I for one know they used to be based in Gardner, Massachusetts, but their parent JCI for whatever reason closed down said headquarters some years back (even though Simplex had used & occupied it without a problem for decades).
North America to be specific (mainly Canada & the United States), though as randomperson said their systems can be found across the world.
They are also found in asian countries such as china, the Philippines, indonesia, india, etc. They used to also be found in several european countries such as the UK.