A tank pressurization system is provided for delivering pressurized air from a pneumatic distribution system to a product tank in an air seeder. The tank pressurization system has a meter housing which has an air inlet in fluid communication with the pneumatic distribution system and an air outlet in...http://www.google.com.hk/patents/US5947040?utm_source=gb-gplus-share專利 US5947040 - Tank pressurization system for air seeder
