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Valves, namely, flow-control valves, metering valves, shut-off valves, outlet valves and stop slide valves for the transport of bulk materials and liquid goods from one container to another or from a container to a processing machine in the food industry, pharmaceutical industry and chemical industry; valve systems comprised primarily of flow-control valves, metering valves, shut-off valves, outlet valves and stop slide valves for the transport of bulk materials and liquid goods from one container to another or from a container to a processing machine in the food industry, pharmaceutical industry and chemical industry