A system for classifying industries. Established in 1937. Similar to and generally superseded by the North American Industry Classification System (NAICS). Still used by the Occupational Health and Safety Administration (OSHA) and by the U.S. Securities Exchange Commission (SEC).
Software and content available as one open source download package. Not sure if you can extract the content separately.
Can be browsed online via the Vocabulary Bank for Education but interface is complicated so probably better to download.
Will be translated into more languages. "The complete thesaurus, or any substantial part of the thesaurus, may not be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise without the permission of the copyright holder."