The B3 series appear to mostly be copies of Sharp designs. Hell, the whole -= += ×÷ nonsense was something Sharp introduced in 1970. edit: interestingly enoug

The B3 series appear to mostly be copies of Sharp designs. Hell, the whole -= += ×÷ nonsense was something Sharp introduced in 1970. edit: interestingly enough, the Sharp QT-8 also had the funky 8-segment display.