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http://www.app104.com.tw/en/delay-lines-ttl-active-14a-15a-24a-series-8-pin-leading-and-trailing-ttl-active-delay-line14a-15a-24a-series/
Delay lines-TTL Active-14A/15A/24A Series . 8 PIN Leading and Trailing TTL Active Delay Line(14A/15A/24A Series)