NNN E 00920 : B
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
31-01-1996
Requirements for a boiling flask, Soxhlet extractor, and Friedrichs condenser to construct an extraction assembly for laboratory use.
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