An inexpensive stereoviewer for color views on cardstock. The box held 10 stories with 10 views each. Five views came on a card, to be cut apart by the user.

The first card in each story lists the illustrators as Paul & Charlie Satterfield (or P. & C. Satterfield) of Hollywood. There was a Paul Satterfield who was an animator and director for Walt Disney and worked on Bambi and Fantasia in the 1940s. It seems likely this is the same person. I've found nothing online about Charlie Satterfield (Perk 2024).

Between 1948 and 1960, Richard P. Fuller filed for a number of patents for slide viewers of various kinds while apparently working for Craftsmen's Guild. I haven't found a patent for the Tri-Scope, but the viewer says "Patent Pending" on the bottom.