Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 167,717 pages of information and 247,131 images on early companies, their products and the people who designed and built them.
Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 147,919 pages of information and 233,587 images on early companies, their products and the people who designed and built them.
of Pittsburgh
1877 Patented a method of rolling metal bars to leave a thickened section (typical thicker at each end to allow the formation of eye bars, as used on bridges). US Patent 188,741 here.
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