37 Installation, maintenance and repair of textile machines and apparatus; installation, maintenance and repair of measuring, weighing, testing and analyzing apparatus and instruments for textile materials and products; installation, maintenance and repair of checking and testing apparatus for textile materials and products; installation, maintenance and repair of computer hardware; maintenance of textile-spinning machines, power winding machines for yarn, spinning frame machines for yarn, weaving looms, knitting machines, cutting machines for cutting textile materials and products, testing machines for textile materials and products, textile fibers and textile ribbons and strands, thread and yarn testing machines, checking and testing machines for fabrics and knitwear, namely, adjustment and control of textile-spinning machines, power winding machines for yarn, spinning frame machines for yarn, weaving looms, knitting machines, cutting machines for cutting textile materials and products, testing machines for textile materials and products, textile fibers and textile ribbons and strands, thread and yarn testing machines, checking and testing machines for fabrics and knitwear; calibration of apparatus for the textile industry