Illustrated description of a device installed on the Charles River bridge, at Boston. (400 w.) (No. 36232)
An automatic bumper for drawbridges
Elec Ry Jour
1912
Article (Journal)
English
© Metadata Copyright Elsevier B. V. All rights reserved.
Engineering Index Backfile | 1896
Rail-end connections for drawbridges
Engineering Index Backfile | 1914
Yielding barriers close roads at Drawbridges
Engineering Index Backfile | 1919
Chicago has problem to protect street traffic at drawbridges
Engineering Index Backfile | 1917
|Automatic plant for polishing bumper bars
Engineering Index Backfile | 1962