2 technician commands, 1 reset main control board – DoorKing 1820 Telephone Intercom User Manual

Page 50

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2 technician commands, 1 reset main control board | DoorKing 1820 Telephone Intercom User Manual | Page 50 / 63 2 technician commands, 1 reset main control board | DoorKing 1820 Telephone Intercom User Manual | Page 50 / 63
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