The following is from a 1965 Model 35 Teletype sales brochure:
These units are new. They are designed for heavy-duty use in instantly communicating information in printed page form. They can be used in inter- and intra-location systems that range in complexity from simple 2- or 3-point arrangements to ones involving many hundreds of stations.
Successors to today's most widely used teletypewriting equipment, the Model 28 Line, the Model 35's inherit the same reliability with a minimum of maintenance. Unlike the Model 28's, however, the Model 35's are compatible with the newly approved ASCII code*. This means they can offer many extra benefits such as typewrite-like four-row keyboards that eliminate shifting for figures and the more common punctuation marks. On the following page, you'll find more features of the Model 25's.
*American Standard Code for information interchange developed by the American Standards Association.
A video of a Model 35ASR in action is available here.