The IBM 4704 (further details here) uses application-specific buckling spring keyboards of relatively unique layouts. This page details the examples that I’ve come across personally.
In 2011, while consulting with fellow enthusiasts of IBM keyboards, I was introduced to the keyboards for the IBM 4704 display terminal. This is the terminal for the IBM 4700 Finance Communication System, introduced at the beginning of the 1980s. This page details the information and resources I have been able to find about this system, notably surrounding 4704 terminals for this system and repurposing 4704 input peripherals for modern computers. Continue reading