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Excerpt from Progress Report of the National Screw Thread Commission: Authorized by Congress, July 18, 1918, H. R 10852, as Approved June 19, 1920, January 4, 1921 Criticisms and suggestions for the improvement of the report should be addressed to the National Screw Thread Commission, Bureau of Standards, Washington, D. C. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.