Grace's Guide

British Industrial History

Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,518 pages of information and 233,949 images on early companies, their products and the people who designed and built them.

David F. Wiseman and Sons

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Butterfly Valve

David F. Wiseman and Sons

1958 Assigned US patent 3,080,145 Butterfly Valve from Frank Edward Swain.

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