This simple device facilitates the use of any tube, helping to squeeze it evenly and gently. It consists of a base in a hole which is inserted the tube, and turning a key with slit for exciting a planar end of the tube. The base and key are made of wooden bars of appropriate dimensions. Their interaction is clear from the figure.
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SCHEMATICE WITH ICE…
"School" model class F2D — further development of the schematic published in "M-K" № 7, 1986 in the article "Record holder... simplicity." Indigenous improvements of the characteristics...
