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Radio Insulators¹
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Installing Pyrex insulators at station WRNY, Hotel Roosevelt, New York City

INSTALLING PYREX INSULATORS AT STATION WRNY
HOTEL ROOSEVELT, NEW YORK CITY



*PYREX Radio Insulators have been adopted by Commander Byrd for his Antarctic Expedition. They are installed on his aeroplanes and base ship and will be used also at his shore and island stations.



C-70 Printed in U.S.A. 5M -- 9-28