Initially, he built a mechanical pedal keyboard, using coat hanger wires to transfer the pedal action to the membrane keyboard.
(he; built; a mechanical pedal keyboard; T:Initially) Context(he built,List([11, 19))):(he; built a mechanical pedal keyboard using; coat hanger wires; to transfer the pedal action to the membrane keyboard)
he built,List([11, 19))
he he
built built a mechanical pedal keyboard using
a mechanical pedal keyboard T:Initially
coat hanger wires to transfer the pedal action to the membrane keyboard