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March 18, 1964 Source: Dentaku Museum(no reference, no source given) "Announcement; Price Undecided"
March 19, 1964
Below is a translation from announcement made in the Nihon Keizai Shimbun newspaper on March 19, 1964 (no picture came with the announcement):
"The specifications of this calculator are 20 calculated digits, 80 calculation speeds per second, 60 subtractions, 2.5 multiplications, 1.2 divisions, and a weight of 25 kg. This is faster than an electric tabletop calculator and has no noise or vibration at all. The price is around 500,000 yen each, and the initial monthly production target is around 300 units."