Identifying Triggers

[Lapua40X]

I have a collection of Remington 700 triggers that extend back quite a few years. There are slight differences within the group that make it obvious they are different models but I can't seem to find any documentation that sets one of them apart from another.
Anyone have a link to comparative images that catalogues the history of Rem. 700 triggers. I'm not interested in articles that speculate exclusively about their relative safety. Just looking for data on what features set on apart from the other.

 

[Dans40X]

Earliest to latest configuration-
Trigger group side plates -quad staked w/ 2pc sear/safety bar & flat knob bolt lock safety.
Trigger group side plates- button head riveted w/ matte nickel plated sear/safety bar & round knob bolt lock safety.
Trigger group w/ chrome plated sear/safety bar & round knob non bolt locking safety.
Solid trigger shoes.
D prefix lettered receivers & ISS/J Lock era(90's)
Channel shaped trigger shoes.
2006 X Mark/Pro trigger groups & 4ea milled fluted firing pins.

The difference between the 700 & Seven trigger groups is the bolt release lever on the Seven's trigger group.

40X
International w/ fwd/aft adj trigger shoe,3 lever design.
Single shot -2oz,3 lever design(w/o safety)
Repeater -w/safety & bolt release & bottom pull weight adj screw.