An important part of the Railroad industry since the very beginning. But one that doesn't receive much attention.
https://www.gracesguide.co.uk/Morden_Fr ... sing_Works
http://www.idaillinois.org/digital/coll ... s03/id/221
https://patents.google.com/?inventor=Jr ... ct+T+Gibbs
https://www.google.com/books/edition/Ma ... frontcover
https://www.google.com/books/edition/Ma ... frontcover
https://www.gracesguide.co.uk/Morden_Fr ... sing_Works
http://www.idaillinois.org/digital/coll ... s03/id/221
https://patents.google.com/?inventor=Jr ... ct+T+Gibbs
https://www.google.com/books/edition/Ma ... frontcover
https://www.google.com/books/edition/Ma ... frontcover
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