Many years ago I worked in a portrait studio and we used Keith Cameras. Ours were all 4x5s and we used 70mm long roll film backs for color and 5" wide roll film for black and white. The studio was in Ontario, CA only 20 miles or so from the Keith shop in Riverside.

The cameras were well made, very reliable, and the parallax correction system was quite accurate. They do indeed look a lot like the Gowlandflex cameras.

JD