https://www.google.com/books/edition/Geyer_s_Stationer/Ml7lJzdUNFIC?hl=en&gbpv=0<br /> Geyer's Stationer<br /> Devoted to the Interests of the Stationery, Fancy Goods and Notion Trades · Volume 82<br /> 1926

page 36 of the 1926 December issue has a "Rapidex" product for the telephone which sounds ostensibly like a Rolodex-type system