Elevators Hydraulic and Electric —— A Complete Hand Book Containing Full Descriptions and Illustrations of the Mechanism of All the Modern Types of Electric and Hydraulic Elevators; Also Instructions Regarding Their Care and Operation

----- 电梯液压和电动

ISBN: 9781333883751 出版年：2016 页码：112 Calvin Franklin Swingle Forgotten Books

Each type of elevator is clearly illustrated in detail, and the action of the working parts so plainly described that a man does not require to be an expert in such matters in order to comprehend their principles. A complete cate chism of Questions and Answers follows at the close of the subject matter.