A retroreflective cube corner article is manufactured by providing a substrate having a surface that includes cube corner elements formed therein, and removing at least a portion of one of the lateral faces on at least one of the cube corner elements, wherein the height of a peak on such cube...http://www.google.com.au/patents/US6168275?utm_source=gb-gplus-sharePatent US6168275 - Retroreflective cube corner article
