Any risks or scale deposited on metal or plastic surfaces of objects, will be seen more clearly if they are first covered with paint, and then wipe: deepening will save the leftover paint and would like printed.
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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...
