Brad, start by compiling a list of lift manufacturers, Rotary, Mohawk, Challenger, etc. Some of the names you encounter will be just that, names placed on generic Chinese lifts, so then comes the task of categorizing the names into manufacturers who actually make lifts, and those who have them made for them, US made, European made, Asian made, etc. After you build a data base of them, then you can start accumulating data on each company, how long in biz, how many different models they make, etc.
Charles