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HT9170B LF DIP18 01309170B-1 DTMF Receiver DIP18 HOLTEK
HT9170D LF T/R 01309170DS-3 DTMF Receiver SOP18 HOLTEK
HT9200A SOP8 01309200AS DTMF Generators SOP8 HOLTEK
HT9172 DIP18 01309172 DTMF Receiver DIP18 HOLTEK