42 Technical and professional consultancy related to devices and systems and components and equipment for aircraft and helicopters (terms considered too vague by the International Bureau - rule 13(2)(b) of the Common Regulations); research related to devices and systems and components and equipment for aircraft and helicopters and space craft and design, engineering, surveying, testing, development, technical support and engineering management services, related to devices and systems and components and equipment for aircraft and helicopters and space craft (terms considered too vague by the International Bureau - rule 13(2)(b) of the Common Regulations); testing, study or advice of science and technology (terms considered too vague by the International Bureau - rule 13(2)(b) of the Common Regulations); testing or study of machinery apparatus (terms considered too vague by the International Bureau - rule 13(2)(b) of the Common Regulations); designing and engineering of machines, equipment or apparatus (including these parts) or installation which consist of the above; technical consultation and research, writing, design, and testing of new products for others (terms considered too vague by the International Bureau - rule 13(2)(b) of the Common Regulations); technical consultation and assistance related to the design, manufacture, certification, operation, maintenance, repair, overhaul, and modification of aircraft, aircraft parts, helicopter, helicopter parts (terms considered too vague by the International Bureau - rule 13(2)(b) of the Common Regulations); scientific and technological services and research and design relating thereto; technical and professional consultancy, research, design, engineering, surveying, testing, development, technical support and engineering management services, all related to devices, systems, components and equipment for aircraft, helicopters and space craft (terms considered too vague by the International Bureau - rule 13(2)(b) of the Common Regulations); testing, study or advice of science and technology (terms considered too vague by the International Bureau - rule 13(2)(b) of the Common Regulations); engineering