"Use Work-Organizers" advertisement, Bookseller & Stationer and Office Equipment Journal, Toronto, October 1920, Vol XXXVI, No. 10, p70.

https://www.google.com/books/edition/Bookseller_Stationer_and_Office_Equipmen/toZQAAAAYAAJ?hl=en&gbpv=1&dq=dictaform%20meilicke&pg=RA9-PA70&printsec=frontcover

Photo of a work organizer for indexing/filing on both a desktop as well as within the desk drawer.