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Railway mechanical engineer . Fig. 12- □Lockyer Double Beat Valve Showing Assembled Valveand Separate Parts shop which is of sufticient capacity to more than take careof the needs of the road.
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File:Double-beat valve, from beam engine cylinder (New Catechism of the Steam Engine, 1904).jpg - Wikimedia Commons
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Manufacturer of 'Double Beat Valve' from Kolkata by Prima Engineering Works