. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools, and a hand-book for the use of engineers in field and office . Fig. 132.—Teack-bolt. NUT-LOCKS. 295. Design of nut-locks. The designs for nut-locks may bedivided into three classes: (a) those depending entirely on an 332 BAILEOAD CONSTRUCTION. §

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