Well, if you score a bunch of otherwise unidentified individual spare parts, you can take them home and look the part numbers up to see if you can identify what they originally did and what machine they came from... [] ]'>

For this kind of detective work it would be nice to have a number lookup, but if you just have by model, some intelligent guessing often will get you to the right model, just by looking at some of the electronic part date codes within an assembly!