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The first American invention to obtain an English patent
Piece
Catalogue reference: MAF 33/603
This record is about the Grassland Improvement Station. County grassland trials: grant: Royal Agricultural... dating from 1943-1950 in the series National Agricultural Advisory Service and predecessors: Education and Research Correspondence.... It is held at The National Archives, Kew.
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Grassland Improvement Station. County grassland trials: grant: Royal Agricultural Society of England.
MAF 33
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Grassland Improvement Station. County grassland trials: grant: Royal Agricultural...
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