A handheld marking instrument includes a body having a substantially flat shape, a first chamber formed within the body and having an inner surface configured to receive and contain a marking substance within the body, and a first marking device configured to deliver the marking substance to a desired...http://www.google.com.au/patents/US20030143014?utm_source=gb-gplus-sharePatent US20030143014 - Marking instruments and methods of manufacturing marking instruments
