9 Surveying, optical, electronic, optoelectronic, magnetic, inductive, capacitive, measuring, signaling, control, regulating and supervisory checking apparatus and instruments, namely, sensors, in particular optical sensors, electronic sensors for sensing position, length, rotation or angle, sensors for sensing position, length, rotation or angle, photoelectric sensors for sensing position, length, rotation or angle, proximity sensors in the nature of inductive and capacitive sensors; electronic instrument for measuring position and length; position sensors in the nature of electronic positioners and rotation angle sensors; encoders, namely, absolute encoders, and incremental encoders; electronic sensor signal processing and data processing interface modules; electronic input/output modules for sensor signal processing and data processing; electronic interface converters for sensor signal processing and data processing