Show Farm arm Machinery Curb Effective April 30 WASHINGTON April 21 UP UPI Manufacture of all tired rubber d farm arm machinery except harvester harvester- thresher combines must be stopped d April 30 the war production board boar d ordered Tuesday Production o othe of df f the he combines must cease July 31 Included under the April 30 deadline dead- dead deadline line ine are all farm tractors requiring rubber tires W P B officials said additional time ime was permitted makers of combines because a new small-size small machine had been developed requiring re requiring requiring re- re quiring rubber tires for complete efficiency I |