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In page De Havilland Mosquito:

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Initially much of the specialised yellow birch wood veneer and finished plywood used for the prototypes and early production aircraft was shipped from firms in Wisconsin, US.[2] Prominent in this role were Roddis Plywood and Veneer Manufacturing in Marshfield. In conjunction with the USDA Forest Products Laboratory, Hamilton Roddis had developed new plywood adhesives and hot pressing technology.[3] [nb 1]