Did the company build cars for more than 5 years?
This is where it gets tricky. I have to say yes -although they had a change of name in the 20's, but still used the same basic design of car. Focus more on the pre 1920's era.
Also, I'd like to add that this isn't an obscure one-of-built in the basement of a remote castle in South Eastern Scotland kind of car. There is a very comprehensive website devoted to these cars.