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agricultural irrigation units; mechanized agricultural irrigation units; irrigation sprinklers; sprinkler heads for irrigation sprinklers; irrigation spray nozzles; valves sold as an integral component of irrigation sprinklers; valves being parts of irrigation sprinkler systems; irrigation valves for sprinkler systems; sprinkler drops for irrigation sprinklers; pressure regulators for water installations; irrigation end guns; goosenecks for irrigation use; drop weights for irrigation sprinklers