Seeking a timeline of feature introductions by HP

[Vincent Weber]

First programmable (and mag card) was the HP-65 (1974).
First with indirect addressing was the TI SR-52 (1975).
First with PAUSE and merged steps was the HP-25 (1975).
First with continuous memory was the HP-25C (1976).
First with hardware modules was the TI-59 (1977).
First (Yellow) LCD was the Casio fx-501p/502p (1978, one year before the HP-41C). They had been some LCD attempts circa 1972/1973 but nothing really worth of note.
First with alphanumerics could be the HP-41C (July 1979) but also the Sharp EL-5100 (1979, I could never find out with month). In any case the EL-5100 is the very first one with natural formula, preceding the first BASIC (Sharp PC-1211) by one year.
The HP-34C (1979) had the first built-in SOLVE but also INTEGRATE.
The HP-15C (1982) is the first with built-in complex numbers and matrices.
First graphic calculator is not the HP-28C (1987) but the Casio fx-7000g (1985). The HP-28C remains the first symbolic calculator.
The first one with soft keys could be the HP-18C or the TI-95 PROCALC, both from 1986.
The HP-42S(1988) is the first with 2-line display and polar complex entry.
The HP-48SX (1990) is the first with a natural equation writer, and the first with a real PC connection.
The first CAS in the TI-92 (1995).
The TI-89 (1998) is the first one with flash memory.