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The first American invention to obtain an English patent
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Catalogue reference: MAF 136/40
This record is about the Ordnance survey maps: marking of catchment board boundaries on 6 inch scale maps dating from 1930-1951 in the series Ministry of Agriculture and Fisheries and Ministry of Agriculture, Fisheries and.... It is held at The National Archives, Kew.
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Ordnance survey maps: marking of catchment board boundaries on 6 inch scale maps
MAF 136
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Ordnance survey maps: marking of catchment board boundaries on 6 inch scale maps
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