Abstract: A container having associated with it at least one memory device in which a record of the contents of the container is stored, the memory device being addressable such that the record of contents may be altered during use of the container to maintain a record of the remaining contents of the container.

Abstract: A modular fluid spraying system including: at least one container for the fluid or fluids to be sprayed the container being fluid plug connectable to at least one fluid pumping which is in turn fluid plug connectable to at least one boom section, the boom section carrying fluid supply connections and being fluid plug connectable to other boom sections and to at least one sprayhead assembly detachably securable to the said boom section or sections; and at least one electronic data processing circuit electrically plug-connectable to the system and pre-set so as to regulate at least one electrically responsive operating parameter of the system when the system is connected to a source of electrical power in use; whereby various numbers of containers and/or various numbers of boom sections may be added or subtracted to the system to achieve a desired combination of fluid delivery and spray area.