After all, many refer to a bicycle as a Machine.
its not all from 1 factory like a car..
A Bike is a frame with a name on it , and every other part is collected from various other companies,
in large numbers ..
to an assembly facility.
Your bike shop may have a collection of all the various product sheets for the various components ,
factory often packs a copy of those for several components in the shipping box
but they would be too much to pack into the hang tag with the price statement,
So, you have to ask for them , when you buy the bike , it it matters ...(most of the customers don't care)
PDF downloads found online has been mentioned..
you could also buy a few books on bicycle repair & service , to have on your bookshelf @ home..
..