共 50 条
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- [26] INEXPENSIVE NONELECTRICAL LIQUID NITROGEN CONSTANT LEVEL CONTROL SYSTEM FOR ULTRAHIGH VACUUM TRAPPING REVIEW OF SCIENTIFIC INSTRUMENTS, 1964, 35 (08): : 1082 - &
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- [30] IMPROVED LIQUID-NITROGEN LEVEL SENSOR JOURNAL OF PHYSICS E-SCIENTIFIC INSTRUMENTS, 1979, 12 (07): : 584 - 584