General Radio Company

275 MASSACHUSETTS AVENUE CAMBRIDGE 39 MASSACHUSETTS

TELEPHONE: TR owbridge 6 - 4 400

BRANCH ENGINEERING OFFICES

NEW YORK 6, NEW YORK LOS ANGELES 38. CALIFORNIA CHICAGO S. ILLINOIS

90 WEST STREET 1 0 00 NORTH SEWARD STREET 920 SOUTH MICHIGAN AVENUE

TEL. — WOrtti 2 - 58 3 7 T E L. — H 011 y w o o d 9 -6201 TEL.—WAhash 2 - 3 8 20

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