Seeking a timeline of feature introductions by HP

[pinkman]

Even if it is interesting to give TI, Casio and Sharp innovations, I think the OP wanted to keep focus only on HP:

Quote:I'm not thinking only of features where HP was first, but also HP's first offering of a given feature.

Edit:
In fact I already regret my comment! Have the HP features illustrated with the competitors is really a good idea.