Keywords: Tracts vol 25 p89 John Birkinshaw's patent for Malleable Iron Rails 1821 plate description.jpg John Birkinshaw's patent for Malleable Iron Rails 1821 original tract held in the North of England Institute of Mining and Mechanical Engineers and uploaded with the authority of their librarian Jennifer Hillyard 2013-10-15 12 39 35 Patent Specification of John Birkinshaw for Malleable Iron Rails 1821 - original in North of England Institute of Mining and Mechanical Engineers John Birkinshaw PD-Old PD-US Uploaded with UploadWizard North of England Institute of Mining and Mechanical Engineers |