37 Installation, maintenance, repair and modification of machines and machine parts and of tools, in particular for shaping and reshaping, mainly for injection moulding, pressing, punching, deep-drawing, foaming, welding services, in particular repair and welding, for cutting and machining, in particular milling cutting; drilling and deep-hole drilling; introduction and optimisation of tools, including at the customer's site (term considered too vague by the International Bureau - rule 13.2.b) of the Common Regulations)