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generate, transform, transmit, distribute, or manage electricity necessary to operate qualified tangible personal property; and all other tangible personal property that is essential to the operations of a computer data center. The term "qualified tangible personal property" also includes building materials physically incorporated into the qualifying data center. To document the exemption allowed under this Section, the retailer must obtain from the purchaser a copy of the certificate of eligibility issued by the Department of Commerce and Economic Opportunity. This item (32) is exempt from the provisions of Section 3-55. (33) Beginning July 1, 2022, breast pumps, breast pump collection and storage supplies, and breast pump kits. This item (33) is exempt from the provisions of Section 3-55. As used in this item (33): "Breast pump" means an electrically controlled or manually controlled pump device designed or marketed to be used to express milk from a human breast during lactation, including the pump device and any battery, AC adapter, or other power supply unit that is used to power the pump device and is packaged and sold with the pump device at the time of sale. "Breast pump collection and storage supplies" means items of tangible personal property designed or marketed SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468