تويت
Machinery’s Reference Series Each Number is One Unit in a Complete Library of Machine Design and Shop Practice Revised and Machine Design and Shop Practice Revised and Republished From Machinery
Methods of Testing the Hardness of Metals The Brinell Method of Testing the Hardness of Metals, by Erik Oberg, Machines for Testing the Hardness of Metals by the Brinell Method
The Shore Scleroscope, by a. F. Shore and J. F. Springer , The Ballentine Hardness Testing Device , The Derihon Method for Testing the Durability of Metals
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