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INDUSTRIAL EDUCATION SERIES
SHEET METAL DRAFTING
PREPARED IN THE
EXTENSION DIVISION OF
THE UNIVERSITY OF WISCONSIN
BY
ELLSWORTH M. LONGFIELD
HEAD, SHEET METAL DEPARTMENT,
BOSTON TRADE SCHOOL
First Edition
McGRAW-HILL BOOK COMPANY, Inc.
NEW YORK: 370 SEVENTH AVENUE
LONDON: 6 & 8 BOUVERIE ST., E. C. 4
1921
