Sigh, Knew what I meant, typed something else.
Also was mentioned in IIRC New Scientist, as a sole means of pumping of a valved off system for hobby use. Only if you can get LN2 of course.
Sigh, Knew what I meant, typed something else.
Also was mentioned in IIRC New Scientist, as a sole means of pumping of a valved off system for hobby use. Only if you can get LN2 of course.
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