A channeled photosensitive element and a process and apparatus for laminating the same are described. In particular, a substantially solid, photoresist-forming layer having grooves or channels therein is applied with pressure to a surface having raised areas, such as a printed circuit board without entrapping...http://www.google.ca/patents/US3984244?utm_source=gb-gplus-sharePatent US3984244 - Process for laminating a channeled photosensitive layer on an irregular surface
