... , 21W6, 12W6, 13W6, 17W5, 21WA4, 25W3, 24W7, 36W4, 30WS7 (under research) and 43W2.)4.Mixing floating mounted type with low frequency ... , 21W6, 12W6, 13W6, 17W5, 21WA4, 25W3, 24W7, 36W4, 30WS7 (under research) and 43W2.)5. Mix-mounted special contact element (There are ...