stiffleg derrick dragline.pdf · engineering and contracting for december 17, 1919. 691 railway...

2

Upload: halien

Post on 10-Mar-2018

218 views

Category:

Documents


3 download

TRANSCRIPT

Page 1: Stiffleg Derrick Dragline.pdf · Engineering and Contracting for December 17, 1919. 691 Railway Grading with Stiffleg Derrick Draglines TWO ordinary stiff-leg derricks equipped with
Page 2: Stiffleg Derrick Dragline.pdf · Engineering and Contracting for December 17, 1919. 691 Railway Grading with Stiffleg Derrick Draglines TWO ordinary stiff-leg derricks equipped with