Search Criteria: mark and xxi
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Twin 6 : Twin 6" naval gun on Mark XXI mounting in workshop - front left hand quarter view at 0 degree elevation : 1930 Twin 6 : Twin 6" naval gun on Mark XXI mounting in workshop - front left hand quarter view at 10 degree and 45 degree elevation : 1930 Twin 6 : Twin 6" gun on Mark XXI mounting - front left hand quarter view at 30 degree elevation - in workshop : 1930
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