The relevant provision runs thus: "21(1) Notwithstanding anything contained in this Act, every person who, on the date immediately preceding the date of vesting, occupied or held land as . . (h) a tenant of sir of land referred to in sub clause (a) of clause (i) of the explanation under section 16, a sub tenant referred to in sub clause (ii) of clause (a) of section 20 or an occupant referred to in sub clause (i) of the said section where the land holder or if there are more than one land holders, all of them were person or persons belonging (a) if the land was let out or occupied prior to the ninth day of April, 1946, both on the date of letting or occupation, as the case may be, and on the ninth day of April, 1946, and (b) if the land was let out or occupied on or after the ninth day of April, 1946, on the date of letting or occupation, to any one or more of the classes mentioned in sub section (I) of Section 157.