there was a link to this on another thread somewhere if you get permission in writing from said companys you could get stickers made be carefull using logos with no permission but names of manufactures are fine
polyflor is an easy one i did it recently if you contact them they will email you a form to fill out email back so they have your details stored
If you get in contact with the companys whom you want the logos for, they will (if they approve you) send you hi-res images for you to give to local sign writers etc Thats what i did, worked brilliantly! Not worth using logos if you need permission and chance it, they will demand you rip em off if found out. Not worth the agri imo, best to get permission