Components can be supplied mounted on carrier tapes. Hydraulic energy may be supplied by a pump, or stored in accumulators. In laboratory use, clean air may be supplied through attached hoses. Later China also supplied some equipment. Bose has since supplied audio systems for many car manufacturers. Alternatively dsRNA can be supplied without genetic engineering. Fuel is typically supplied via a fuel pump. Protein should be supplied only for anabolic purposes. This machine could be supplied by a dedicated generator. Electricity was supplied by portable generators. Previously, Microsoft had supplied such documentation freely but only on request. Instead, the crossings were supplied with additional protections. Aivazovsky also supplied Feodosia with drinking water. Also, M113s were supplied to the ARVN. However, electricity has always been supplied from Italy.