(1) In the Esso case, the restraint in a supply and purchase contract was reinforced in a mortgage deed.

(2) In the mortgage deed the respondents further covenanted that they would purchase all their requirements from the appellants exclusively.

(3) Again, the appropriate mortgage deed will be sewn into the back of the certificate.

(4) We would give the same construction to the comparable provisions in the other mortgage deeds.

(5) Accordingly, we would construe the guarantee and debenture in the same way that we have construed the mortgage deeds.