Many articles used in a building are practically part of it, yet legally the question of whether or not they were included in the sale, if not specifically mentioned, might give rise to dispute, such as shades, curtains, janitors' tools, runners, etc. A great deal of trouble also has been occasioned by reason of the owner turning over to the purchaser without any explanation articles to which he has no title, having not yet paid for them, as gas stoves, ice boxes, etc. To prevent quibbling and to compel the seller to state positively his ownership, the contract reads, "All personal property appurtenant to or used in the operation of said premises is represented to be owned by the seller and is included in this sale."