Modular Security Systems Incorporated (MSSI), is leading the one stop shop to a more secure world, and we're building it one turnstile at a time. The patented Modular Access Control (MAC) Portal was the first of MSSI modular security/perimeter security systems to recieve a patent from the US patent and Trademark Office. The Patented MAC Portal is a portable access control system with full height turnstiles and access control technology. Modular Security Systems Inc. is an Ohio based intellectual properties holding company with expertise in designing and portable perimeter security systems that can incorporate any type of access control technology as well as any manufacturers brand turnstiles. MSSI can be found online at SecuredByMAC.com. Visit Us!