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Over the past several years, we have seen a dramatic reduction in demand for narrowband analog filters. Due to this and other economic reasons, Filter Products will be discontinuing its mechanical filter products in the near future.
https://www.rockwellcollins.com/Capa...s_Filters.aspx
Так что спешите купить опции, кто хотел, а то как обычно, подорожает и подделки пойдут...