How to be if urgently need to carry out drafting work using ink, a special ruler with a raised above the paper edge among the tools was not there! A way out of this situation is shown in figure — two or three paper clips fixed to the usual square or line, thereby eliminating the leaking of mascara under them.
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The editors have received many letters on the publication of "Biogas: and warms, and cooks" (see "M-K" № 1, 1987), based on the materials of the Romanian journal "Technium". Of readers...
