Wheel alinement indicator

Claim 1

VEHICLE WHEEL ALINING APPARATUS COMPRISING, IN COMBINATION, A GAUGE TO BE ATTACHED TO THE WHEEL AND INCLUDING MEANS FOR DETERMINING AT LEAST ONE CRITERION OF WHEEL ALINEMENT, AN INDICATOR OPERATIVELY ASSOCIATED WITH SAID MEANS AND INCLUDING A SCALE PLATE HAVING A SLOT THEREIN REVEALING SAID INDICATOR AND HAVING SCALE MARKS THEREON ADJACENT SAID SLOT FOR INDICATING THE VALUE OF SAID CRITERION, AT LEAST ONE REPLACEABLE SCALE PLATE FOR SAID INDICATOR CORRELATED TO RESPECTIVE VEHICLES AND ADAPTED TO OVERLIE SAID FIRST-NAMED SCALE PLATE, SAID REPLACEABLE SCALE PLATE HAVING A SLOT THEREIN SUBSTANTIALLY COEXTENSIVE WITH THE SLOT IN SAID FIRST-NAMED PLATE, MEANS FOR MOUNTING SAID REPLACEABLE SCALE PLATE ON SAID FIRST-NAMED SCALE PLATE WITH THE SLOTS THEREOF IN ALINEMENT WITH ONE ANOTHER TO ALINE THE REPLACEABLE SCALE PLATE WITH SAID INDICATOR, SAID REPLACEABLE SCALE PLATE INCLUDING A SCALE ADJACENT THE SLOT THEREIN CO-OPERATING WITH SAID INDICATOR AND COMPRISING FIRST INDICIA CORRELATED TO THE FACTORY SPECIFICATION OF THE CRITERION FOR THE RESPECTIVE VEHICLE AND CO-OPERABLE WITH SAID INDICATOR TO INDICATE COMPLIANCE WITH THE FACTORY SPECIFICATION, AND SECOND INDICIA DISPOSED TO OPPOSITE SIDES OF SAID FIRST INDICIA AND CO-OPERABLE WITH THE INDICATOR TO INDICATE THE AMOUNT OF CORRECTION REQUIRED AND THE MANNER IN WHICH TO EFFECT SUCH CORRECTION WHEN THE CRITERION IS NOT IN COMPLIANCE WITH THE FACTORY SPECIFICATION.