7^6 ¥i - PDF Document
7^6 ¥i. REPORT CCG 71-57, NBS 2210471. NBS IR 75-648. /. ULTRASONIC INTERFEROMETER MANOMETER. Fetev L. M. Heydemann. Pressure and Vaouvm Section. Heat Division, NBS. 20234. Washington,. B.C. January. 1975.
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