Thank you 'snucci'. It's the "magnetic valve" switches that gets attention I'll bet. As a "data entry system", a keyboard layout akin to the IBM 129 Keypunch certainly makes sense. From their sales brochure: "replacing inefficient, expensive on-line terminals, key/disk clusters, key-tape and key-diskette stations, keypunches, hand-file systems and other remote data entry devices." And in particular: "Ease of learning and use begins with the keyboard designed in the familiar typewriter, keypunch or adding machine style." It's interesting that it assigns the adding-machine style keypad (1-over-M and then increases rightwards and upwards) whereas the original IBM keypunch assigns 1-over-U, and then increases rightwards and downwards.