Attachments for lawn mowers, namely, operator-controlled discharge chute blockers and component parts therefor; Accessories for lawn mowers, namely, operator-controlled discharge chute blockers, and component parts therefor; Attachments for lawn mowers, namely, discharge opening covers, and component parts therefor; Accessories for lawn mowers, namely, discharge opening covers, and component parts therefor; Discharge opening covers for use with lawn mowers, and component parts therefor; Attac...