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Not to alter the mode of admeasurement to ascertain light duties, &c.
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XVII. Provided always, That nothing herein contained, shall in any wife be construed to alter the manner of admeasuring the tonnage of any ship or vessel, which has heretofore been practised for the purpose of ascertaining the light duties, or any other duties or imposts whatever, payable according to the tonnage of any ship or vessel.
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