General Radio Company

275 MASSACHUSETTS AVENUE CAMBRIDGE 39 MASSACHUSETTS

TELEPHONE: TR owbridge 6- 4 400

BRANCH ENGINEERING OFFICES

NEW YORK 6. NEW YORK LOS ANGEIES 38, CALIFORNIA CHICAGO 5, ILLINOIS

90 WEST STREET 1 000 NORTH SEWARD STREET 9 20 SOUTH MICHIGAN AVENUE

TEL.—WOfth 2 - 5 8 3 7 T E L. — H 0 11 y w 0 0 d 9 - 6 20 1 TEL. WAbash 2 - 3820

VOLUME XXVII No. 2 JULY, 1952

Copyright, 1952, General Radio Company, Cambridge, Mass., U. S. A.

VOLUME XXVII No. 2 JULY, 1952

Copyright, 1952, General Radio Company, Cambridge, Mass., U. S. A.

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