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kohteen on oltava vesijäähdytetyssä kotelossa, jonka etuseinän on oltava hyvin kiillotettua metallia, tasainen, samalla kohdalla kohteen tason kanssa, ympyränmuotoinen ja halkaisijaltaan noin 25 mm.
the target shall be contained within a water cooled body the front face of which shall be of highly polished metal, flat, coinciding with the plane of the target and circular, with a diameter of about 25 mm.