A warranty of 'quiet possession' in a contract for the sale of chattels located on land owned by a third party does not extend to interference by that third party based on its ownership of the land, where neither vendor nor purchaser held any interest in the land and both knew this at the time of contracting. The term 'encumbrance' in such a contract refers to interests, rights, claims or demands in or over the chattels themselves, not claims founded on ownership of the land on which the chattels are situated. Pre-contractual negotiations remain admissible to identify the subject matter of a contract where the contractual description is ambiguous.
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