We recently came across a great photographic history of rollerskiing with some incredible images of early equipment. Skiroll.it reports that rollerskiing first appeared in the 1930's and has a photo dated at 1958. The equipment has come a long way since the earliest models, but interestingly, the changes over the last 30 years have not been as large as one might expect.
And here is video of the true pioneers! (Thanks to Mark Nadell of Far West for alerting us to this video)