I used to work with a bunch of guys who did this kind of thing, we called them technical writers - they produced manuals and technical specifications that would be distributed with our software. I expect they are known by the same term in other industries - but I could be wrong.
I have a friend in Norway who produces this kind of thing for many industries including the automobile industry. If you want his contact details then send me a PM. I have no idea what his rates are but I am sure he can provide sample work and a quote.
You should be looking for a technical writer if you want things like product manuals written.
If you want more general (say advertising or marketing) writing, you should be looking for a copywriter.
If you want your autobiography written, then you look for a ghost writer.
Long day - yes I stand corrected.
I'm just looking for a writer......
lionrock88 - just sent you a PM.
Hi,
I've just sent a PM too