A structurally improved spray gun includes a hollow housing having a hollow handle, an electromagnet in the housing to acturate an oscillating armature which repeatedly impinges a piston in a cylinder to aspirate the paint from a container into the cylinder to spray out to the atmosphere through a nozzle...http://www.google.com.au/patents/US6631855?utm_source=gb-gplus-sharePatent US6631855 - Structurally improved spray gun
