"In supplying such an implied term the Court, in truth, declares the whole contract entered into by the parties. In this connection
the concept, common intention of the parties, comprehends, it would seem, not only the actual intention of the parties but also an
imputed intention. In other words, the Court impl
es not only terms which the parties must actually have had in mind but did not trouble to express but also terms which the parties,
whether or not they actually had them in mind, would have expressed if the question, or the situation requiring the term, had been