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Keywords: QF 4 inch Mk XVI gun on Mk XX mounting plan diagram.jpg Plan view diagram showing British QF 4-inch Mk XVI naval gun on Mk XX mounting Plate 4 in B R 257 Handbook for the 4 inch Q F Mark XVI Gun on the H A Twin Mark XIX And Single Mark XX Mountings G3821/41 July 1941 <br>Scanned by Historic Naval Ships Association Downloaded from http //www hnsa org/doc/pdf/br257 pdf 1941 Naval Ordnance Department Admiralty UK PD-Art QF 4 inch Mk XVI naval gun |