Earliest handheld / battery calculator with hyperbolics?

[Didier Lachieze]

(05-08-2018 09:16 PM)Gene Wrote:  Sharp ? Don't recognize the model.

Which model is this? Looks like the PC-1801 or PC-1802, but those did not have hyperbolics.

Any earlier model with sinh, cosh, tanh built-in?

This looks very much the Sharp PC-1801 which don't have hyperbolics, it may be a confusion with the Sharp PC-1001 from 1973 which has built-in hyperbolics, but the PC-1001 is a desktop calculator, not a handheld / battery calculator.