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Automatic sprinkler installation consisting of sluice valve
Automatic sprinkler installation consisting of sluice valve, piping, cocks, pressure gauge, gong driven by water pressure. Terminating in two Grinnell's patent, 1881-90 sprinklers.
Automatic sprinkler installation consisting of sluice valve, piping, cocks, pressure gauge, gong driven by water pressure. Terminating in two Grinnell's patent, 1881-90 sprinklers.