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среднее [нейтральное\] положение механизма
Англо-русский словарь технических терминов. 2005.
Англо-русский словарь технических терминов. 2005.
Walschaerts valve gear — The Walschaerts valve gear is a type of steam engine valve gear invented by Belgian railway mechanical engineer Egide Walschaerts in 1844. The gear is sometimes named without the final s , since it was incorrectly patented under that name. It was … Wikipedia