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The Indicator is an invaluable resource for anyone interested in the elevator industry. This volume includes Volumes 3-4 of the serial, which cover a wide range of topics related to elevators, including engineering, safety, design, and maintenance. The writers and contributors are all industry experts, making this a must-read for anyone who wants to stay abreast of the latest advances and trends in the field.This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it.This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.