Last night, I saw a Dacotah Paper Company truck much like this one.
I can't read the subtitle on the one in the above image, but I don't think it's the same as the one on the truck that I saw. The side of the truck that I saw said:
The egregious use of quotation marks here gives the impression that the subtitle is not so much fact but the allegation of a single person. It is one man's testimonial, not something that is generally accepted.
Further, I have always hated the idiom:
[Doing something] since
[some year]. They are trying to convey:
Established: [some year]. What they are getting across to me
is that even this one dude wouldn't assert that they were anything
more than a thorn in the region's side prior to 1906.