Testing Helium Used For The ZR-3 -- Secretary work of the department of the interior and S.C. Lind, Chief chemist of the bureau of mines, are shown here watching a test of helium gas such as is used to inflate the dirigible ZR-3. Experiments are being made at the department with this type of gas which is non-explosive and non-inflammable.... November 15, 1924.
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TOP27912717
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達志影像
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RM
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