GRAY-ENCODER (SHAFT POSITION ENCODER, ABSOLUTE ENCODER). OLD AND NEW TYPE: AB90STR001 NEW REPLACING TYPE WITH INVERTED GRAY-CODE: CBM912-12BTS004 ENCODER TO BE USED (REPLACING AB90STR001 TYPE ENCODERS): TYPE: CBM912-12BTS004 DESIGNATION: CBM9S12//5CNR//12//00R//****51