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you may have used the same patented designs well into the late 1930's.
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Correct! Where did I get the information from? Copies of the 1936 Specifications that were referred to and studied at length by the Department of National Defence, Ottawa, from 1937 onwards. The Scammell bogie as used in the [Canadian] Ford-Scammell and Chevrolet-Scammell FATs as well as a [British] Dennis-Scammell and Bedford-Scammell FATs complied with the patents.