A. Marketing & Service Co. A. Marketing & Service Co. provides the following power protection products: SPD/TVSS: UL1449 3rd Edition Listed Surge Protection Devices (SPD/TVSS). Transformers: Dry type, harmonic mitigating, hazardous use, K-rated and zig-zag. UPS: Double Conversion, Modular & Traditional; single phase and three-phase. Harmonic Filters: Magnetic, passive and active Grounding: Electrolytic ground rods & low resistance back-fill. Lightning Dissipation: multi-point discharge products, lightning rods, system design and component parts. Company Overview brochure State of Texas HUB Certificate Send mail to webmaster@amarketingservice.com with questions or comments about this web site.