Most unique / sub niche industries you have found in search?

November 26, 2021
by an investor from Virginia Polytechnic Institute and State University (Virginia Tech) in Dallas, TX, USA
What are some of the most unique / sub niche industries you have found through your search process that meet the basic search fund criteria?
I'll start:
+ Life insurance settlement
+ Transloading and mixing of chemicals (rail)
+ Disposal wells for oil and gas
from Harvard University in Fort Wayne, IN, USA
from University of Oxford in San Francisco, CA, USA