The term "sale at retail" shall not include (i) any such transfer of tangible personal property or rendition of services for the purpose of resale, or (ii) such rendition of services or the transfer of tangible personal property including, but not limited to, machinery and equipment and parts therefor and supplies to be used or consumed by the purchaser directly in the operations of--
(D) Processing as defined in clause (d) of this section.
The exclusions provided in paragraphs (A), (B), (C) and (D) shall not apply to any vehicle required to be registered under The Vehicle Code, except those vehicles used directly by a public utility engaged in business as a common carrier; to maintenance facilities; or to materials, supplies or equipment to be used or consumed in the construction, reconstruction, remodeling, repair or maintenance of real estate other than directly used machinery, equipment, parts or foundations therefor that may be affixed to such real estate.
The exclusions provided in paragraphs (A), (B), (C) and (D) shall not apply to tangible personal property or services to be used or consumed in managerial sales or other nonoperational activities, nor to the purchase or use of tangible personal property or services by any person other than the person directly using the same in the operations described in paragraphs (A), (B), (C) and (D) herein.
The exclusion provided in paragraph (C) shall not apply to (i) construction materials, supplies or equipment used to construct, reconstruct, remodel, repair or maintain facilities not used directly by the purchaser in the production, delivering or rendition of public utility service, (ii) construction materials, supplies or equipment used to construct, reconstruct, remodel, repair or maintain a building, road or similar structure, or (iii) tools and equipment used but not installed in the maintenance of facilities used directly in the production, delivering or rendition of a public utility service.
The exclusions provided in paragraphs (A), (B), (C) and (D) shall not apply to the services enumerated in clauses (k)(11) through (18) and (w) through (kk), except that the exclusion provided in this subclause for farming, dairying and agriculture shall apply to the service enumerated in clause (z).