From the book "The Dawn of Diagnostic Ultrasound" by Toshio Wagai, 1987. (In Japanese)
Earliest A- and B- mode scanner fabricated from modificatons of the original A-scope, around 1955. Scans were called "ultrasono-tomograms".
Schematics of the early design, 1955.
Back to History of Ultrasound in Obstetrics and Gynecology.