Charitable tax exemption under clause 23C(iv) granted to museum, subject to exclusive income use and compliance conditions. Notification designates K.D. Malviya National Oil Museum as eligible for the charitable exemption provision for specified assessment years subject to conditions requiring exclusive application or accumulation of income for its objects; investment or deposit of funds only in permitted forms; exclusion of business income unless incidental and separately accounted; regular filing of income-tax returns; and transfer of surplus and assets on dissolution to a like-minded charitable organization.