The HP-37s scientific calculator?

[lrdheat]

[kby]...we had a Wang Nixie tube calculator in our high school physics classroom! ~1971 as well! If I remember correctly, the display color was an amber color. In a math classroom, we had an HP 9100A with plotter. I dreamed of having something like it for myself, never imagining that much more sophisticated technology would become available in handheld size during my lifetime!