Excerpt from "National" Pipe Standards: Appendix to 1913 Edition Book of Standards; Containing Tables and Useful Information Pertaining to Tubular Goods as Manufactured by National Tube Company, Pittsburgh, Pa
For-a number of years National Tube company has been publishing, at intervals, informatory, educational literature in various forms which has a widely acknowledged value, as evidenced by the constantly increasing requests from technical and practical engineers, mechanical men, manufacturers, students and many others interested in pipe and allied products.
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