A seeding apparatus having a distribution manifold with selectively openable outlet ports thereon, to permit or stop delivery of seed or fertilizer to soil A meter device, responsive to both the number of selected open ports and the speed of the apparatus over the ground, is provided to regulate supply...http://www.google.es/patents/US7555990?utm_source=gb-gplus-sharePatente US7555990 - Air seeder/fertilizer apparatus having metering means and distribution manifold with selectively openable ports
Air seeder/fertilizer apparatus having metering means and distribution ...
