Chart reading mechanism

Claim 1

A CHART READING DEVICE COMPRISING, IN COMBINATION, A POSITIONABLE CHART HAVING RAISED SURFACES REPRESENTING CODED INDICIA, A PLURALITY OF SENSING PINS ADAPTED TO SENSE THE CHART, A PLURALITY OF MOVABLE PERMUTATION MEMBERS INDIVIDUALLY CONNECTED TO THE PINS, EACH OF THE MEMBERS HAVING A SMOOTH PERIPHERAL SECTION AND A FIRST AND SECOND NOTCH SPACED IN THE DIRECTION OF MOVEMENT OF THE MEMBER, A FRAME MOVABLE ALONG THE PERIPHERY OF THE MEMBERS, FRICTION MEANS INDIVIDUALLY CONNECTING EACH MEMBER TO THE FRAME WHEREBY MOVEMENT OF THE FRAME IN A FIRST DIRECTION MOVES THE PINS TOWARD THE CHART, A PAWL OPERATIVELY CONNECTED TO THE FRAME AND ADAPTED TO ENGAGE THE NOTCHES TO OPPOSE MOVEMENT OF THE MEMBERS IN A DIRECTION TO ENGAGE THE PINS WITH THE CHART, AND MEANS FOR MOVING THE FRAME IN SAID FIRST DIRECTION UNTIL THE PAWL IS DISENGAGED FROM THE NOTCHES AND ENGAGED WITH THE SMOOTH PERIPHERAL SECTION OF AT LEAST ONE MEMBER AS ITS PIN ENGAGES THE CHART INDICIA AND ARRESTS THE MOVEMENT OF THE MEMBER AND FOR MOVING THE FRAME IN A RETURN DIRECTION DURING WHICH THE PAWL LEAVES THE SMOOTH SECTION AND SELECTIVELY ENGAGES THE NOTCHES ACCORDING TO THE ARRESTED POSITION OF THE RESPECTIVE MEMBERS TO MOVE THE MEMBERS TO RETRACTED POSITIONS THAT VARY ACCORDING TO THE ARRESTED POSITIONS.