Zip Signs receives official COR Certification from IHSA! By Aaron Bennink Posted September 29, 2016 In Uncategorized 0 0 Aaron Bennink Recent PostsA beautiful day for a high level install! (photo in post)2016 Christmas Party – Rock Climbing! (photos in post)Zip Signs receives official COR Certification from IHSA!Zip Signs celebrates 45 years in business Leave a Comment Cancel reply Currently you have JavaScript disabled. In order to post comments, please make sure JavaScript and Cookies are enabled, and reload the page. Click here for instructions on how to enable JavaScript in your browser.