and sealed, and the farmer later says that he was enfeoffed thereof and proffers a  charter or instrument which is denied by the lessor; if he acknowledges the term, and  the document made as to the term and its seal, [and] if the seals of both the term and  the feoffment correspond in all respects, he cannot deny the charter of feoffment because  of the correspondence of the seals, unless he can except against it on grounds of  fraud or duress. Thus charters and documents are proved by a comparison of seals.
If several instruments are produced.
 If when several sealed instruments are put forward none of them has earlier been  acknowledged by the other party or proved by him who produces them, recourse  must then of necessity be had to the instruments of others, sealed with the same seal,  which have earlier been acknowledged or proved.1 It suffices if one of them is proved,  provided both are similar.
Another kind of warranty, that is,2 warranty of charter.
 There is also another kind of warranty called warranty of charter, where one is bound  by his own deed and feoffment, or that of his ancestors, to defend another in his seisin  and acquit him by the service named in his charter when he is distrained and vexed by  others, as by the chief lords, to do more services than are expressed in the charter.  When he is not impleaded as to the tenement he holds, but vexed, as aforesaid,3 in the  county court, and there4 vouches a warrantor, since [it has no power to summon a  warrantor]5 recourse must be had to the lord king's court, and let him who is bound  to warrant be summoned by this writ.
Writ of warranty of charter.
 The king to the sheriff, greeting. Order such a one [B.] that rightfully and without  delay he warrant to such a one [A.] so much land with the appurtenances in such a vill  which he holds and claims to hold of him and as to which he has his [B.'s] charter, as  he says. Or thus: and as to which he has the charter or such a one, the father (or  mother, brother or sister, uncle or aunt, grandfather or grandmother,  greatgrandfather or greatgrandmother) of [B.], though he who complains is a  very remote heir, whose heir he is, as he says. And unless he does so and if the said A.  has made you secure with respect to prosecuting his claim, then summon the said  [B.] by good summoners to be before our justices at Westminster on such a day (or  before our justices