Вот фраза из патента "the torquetransmitting capability of the coupling in relation to rotational speed-difference between the sets of elements being progressive throughout a desired speed difference range by virtue of the inclusion of a predetermined quantity of gas in the viscous fluid in combination with the provision of means defining openings through the said surfaces of the elements" как раз и навела на мысль, что воздуха должно быть строго определённое количество. Нужен толковый переводчик...
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