This keyboard module was OEMed for TRW.
The TRW keyboard module is unique as they were never put into a terminal that they were designed for. No information about the terminal has been found that these modules were designed for. The only information that is currently available is the TRW part number that is displayed on the PCB of the keyboard module. Additionally, the only other information is the NMB part number that is also located on the PCB.
The keyboard’s layout is unique to this keyboard:
The keycaps are made out of PBT with dye-sublimated legends. The keycaps for the keyboard module have the printing centered on all axes. The sides of the keycaps are shiny therefore this module was produced between the late 80's and early 90's.
Bottom of Keycap
The switch plate is made out of stamped steel. The plate is bent on either so that it can be mounted to the upper case. The plate is painted with a thin layer of black paint. The paint is then protected by a thin layer of oil to prevent rust.
The PCB is a double-sided PCB with all traces on the backside of the PCB. There is no keyboard controller therefore, you are able to connect the module straight into a microcontroller and use the keyboard over USB. See the end of the Gallery section for more information.