Seeking a timeline of feature introductions by HP

[EdS2]

(I have an ulterior motive: I'd like to figure out what calculator innovations came out from HP since 2002.) But of more general interest, I would think, would be a timeline from the beginning. I'm not thinking only of features where HP was first, but also HP's first offering of a given feature.

Off the top of my head, I would guess at these features in very approximately this order, for handheld calculators and pocket computers, but I welcome all corrections, additions, and details of model and introduction year:

- first handheld calculator, first consumer product (1972, HP-35)

- first programmable handheld
- first continuous memory (1976, HP-25C)

- first magnetic card storage

- first financial/business offering (1973, HP-80)

- first wristwatch (1977, HP-01)

- first LCD display

- first alphanumeric capable (1979, HP 41)
- first with pluggable ROMs
- first with ability to interface with lab instruments (1979, HP 41)

- first RPL

- first landscape format
- first to offer complex arithmetic
- first to offer matrix operations

- first re-offering of a model with higher performance

- first model labelled to celebrate an anniversary

- first Basic
- first Forth

- first flip-open clamshell model

- first Limited Edition celebration model (2011, HP-15c Limited Edition)

- first CAS (1987, HP-28C)
- first graphing calculator (1987, HP-28C)

- first colour display

- first USB connectivity

- first reprogrammable with user firmware

Having written all that, I see there's an official timeline up to 1990. Which notes these ideas I'd missed:

- first solver (1979, HP-34C)

Edit: see for reference
https://en.wikipedia.org/wiki/HP_calculators
https://en.wikipedia.org/wiki/Comparison...alculators