I'm a bit surprised at the display choices. I thought most hand-held calculators in the 70's used LED displays, which I assume would use less power than VFD's.

I'm a bit surprised at the display choices. I thought most hand-held calculators in the 70's used LED displays, which I assume would use less power than VFD's. Also I don't recall LCD's coming into widespread use until a good bit later, well into the 80's I would think.