40
Treatment of precision optical surfaces; treatment of glass, crystal quartz, optical glasses, and fused silica; crystal bonding; custom manufacture and assembly services; assembly of products for others; adhesive-free bonding process for the assembly of parts, fittings, and components; adhesive-free bonding process for precision optical surfaces; information, consultancy, and advisory services for all of the aforesaid services
42
Scientific and technological services; industrial analysis and research services; professional technology consultancy, research and design services relating to the manufacture, design and calibration of optical, acoustic, electronic, acousto-optic and electro-optic devices, apparatus and systems, fibre-optic devices, lasers and imaging apparatus and systems; design and development of computer programs for the foregoing goods; engineering services; material testing services; chemical analysis services; measurement services; information, consultancy and advisory services relating to all of the aforesaid services