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Partial File Text HDLTEK HT9201A/B Simple Tone Dialer Features Patent Number: 113235(R.O.C.), 5424740(U.S.A.) Operating voltage: 2.0V~5.5V Low standby current 4x4 keyboard matrix 3.58MHz crystal or ceramic resonator F
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16 key 4x4 DTMF 4x4 keyboard for 4x4 keyboard HT9201A keyboard matrix 4x4 keyboard to DTMF