Methods and apparatus for making and using tools, for example concrete cutting blades, may include fluid flow elements within a channel of the blade. Fluid flow elements may include a tube, a transition element including an inlet fitting, a fluid pressure containment structure inserted into the channel...http://www.google.com.au/patents/US20060288991?utm_source=gb-gplus-sharePatent US20060288991 - Tools and methods for making and using tools, blades and methods of making and using blades
