First, the authors describe the viewfinder display of metered information, which indicates both the photographer's choice of shutter speeds & the camera's recommendation if they are different. The author's comment: "This alone is brilliant." This may be true, but if so, the credit belongs to Nikon, who originally employed such a display on the Nikkormat EL - 32 years before the introduction of the R2/3A. They have also used it since then on the FE, FE2, & FM3a. The only difference is that Nikon used a match needle system to display the information instead of illuminated number LEDs. For all I know there may be other companies that have also used such a system, but it certainly didn't originate with Cosina, as implied by the authors.
I'm a bear for detail