Bohm organs are not a known type of organ. It's possible you meant a different type of organ or a misspelling.

Here are some possibilities and where they are made:

* Pipe Organs: These are the traditional, large organs with pipes. They are made all over the world, with prominent manufacturers in countries like Germany, France, the Netherlands, the United States, and the United Kingdom.

* Electronic Organs: These are organs that use electronic oscillators and amplifiers to create sound. They are typically made in various countries including China, Japan, Korea, and the United States.

Could you please clarify what kind of organ you are referring to?