| http://www.w3.org/ns/prov#value | - Depending upon whether cards or keys are being sensed, the ten row positions of each column are scanned in sequence, under control of a ten position sequencer 97, which may comprise any conventional stepping arrangement such as a counter and decoding circuits, A 500 pulse per second clock pulse source 99 advances the sequencer 97 for each column, but is arranged to be gated off and on by signals f
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