An inhalation device of the type adapted to receive and locate an aerosol container designed to administer a multiplicity of metered doses, said aerosol container having a composition under pressure therein and having metering valve means including a valve stem and associated metering means, the valve...http://www.google.es/patents/US4291688?utm_source=gb-gplus-sharePatente US4291688 - Inhalation device
