repair or maintenance of 3D printers and their fittings and accessories; repair or maintenance of machines and tools for engraving metals, glass, ceramics, resin and synthetic resin, leather, stone or wood; repair or maintenance of metal working machines and tools; repair or maintenance of glass working machines and apparatus; repair or maintenance of ceramics working machines and apparatus; repair or maintenance of resin or synthetic resin working machines and apparatus; repair or maintenance of leather working machines and apparatus; repair or maintenance of stone working machines and apparatus; repair or maintenance of wood working machines and apparatus; repair or maintenance of machines and tools for cutting or sharpening metals, glass, ceramics, resin, leather, stone or wood; repair or maintenance of computer machines and apparatus storing computer software for supporting cleaning operation of surgical instruments by reading barcodes marked on used surgical instruments and showing process and procedures of cleaning surgical instruments; repair or maintenance of computers storing computer software to check all the surgical instruments are present and to monitor and track their use record, cleaning and sterilization data of used surgical instruments; repair or maintenance of barcode readers to read barcodes of medical machines and equipment; repair or maintenance of electronic machines and apparatus; repair or maintenance of telecommunication machines and apparatus; repair or maintenance of medical machines and apparatus, dental technical machines, CAD/CAM machines for dental purposes; repair or maintenance of cutting, polishing and sharpening machines for dental and dental technical purposes

Educational and instruction services, namely, arranging and conducting of seminars on how to use synthetic resins, radiation curable unprocessed synthetic resins, thermally curable unprocessed synthetic resins, unprocessed plastics in all forms, unprocessed plastics, zirconia, all for 3D printers; educational and instruction services, namely, arranging and conducting of seminars on how to use dental zirconia for dental prostheses, dental bridges and dental crowns; educational and instruction services, namely, arranging and conducting of seminars on how to use dental resin for dental prostheses, dental bridges and dental crowns; educational and instruction services, namely, arranging and conducting of seminars on how to use dental waxes; educational and instruction services, namely, arranging and conducting of seminars on how to use ceramics, zirconia and silica based resins for dental use; educational and instruction services, namely, arranging and conducting of seminars on how to use dental hybrid resins, dental glass ceramics, dental ceramics, artificial dental materials, synthetic materials for dental use for fillings; educational and instruction services, namely, arranging and conducting of seminars on how to use materials for dental crowns and dental bridges for dental use and for oral prophylaxis; educational and instruction services, namely, arranging and conducting of seminars on how to use composite materials for dental and dental technical purposes; educational and instruction services, namely, arranging and conducting of seminars on how to use dental materials; educational and instruction services, namely, arranging and conducting of seminars on how to use 3D printers and their fittings and accessories; educational and instruction services, namely, arranging and conducting of seminars on how to use machines and tools for engraving metals, glass, ceramics, resin and synthetic resin, leather, stone or wood; educational and instruction services, namely, arranging and conducting of seminars on how to use metal working machines and tools, glass working machines and apparatus, ceramics working machines and apparatus, resin or synthetic resin working machines and apparatus, leather working machines and apparatus, stone working machines and apparatus, or wood working machines and apparatus; educational and instruction services, namely, arranging and conducting of seminars on how to use machines and tools for cutting or sharpening metals, glass, ceramics, resin, synthetic resins, leather, stone or wood; educational and instruction services, namely, arranging and conducting of seminars on how to use computer software for supporting cleaning operation of surgical instruments by reading barcodes marked on used surgical instruments and showing process and procedures of cleaning surgical instruments, and computers for storing the aforementioned software; educational and instruction services, namely, arranging and conducting of seminars on how to use computer software for surgical purposes to check all the surgical instruments are present and to monitor and track their use record, cleaning and sterilization data of used surgical instruments, and computers for storing the aforementioned software; educational and instruction services, namely, arranging and conducting of seminars on how to use computer software for use in medical examination and diagnosis; educational and instruction services, namely, arranging and conducting of seminars on how to use computer software for computer-aided design/computer-aided manufacturing for dental purposes; educational and instruction services, namely, arranging and conducting of seminars on how to use computer software for dental technical machines; educational and instruction services, namely, arranging and conducting of seminars on how to use computer software for medical machines and apparatus; educational and instruction services, namely, arranging and conducting of seminars on how to use computer software for 3D printers; educational and instruction services, namely, arranging and conducting of seminars on how to use barcode readers to read barcodes of medical machines and equipment and computer software used for the aforementioned barcode readers; educational and instruction services, namely, arranging and conducting of seminars on how to use computer software for metalworking machines and tools; educational and instruction services, namely, arranging and conducting of seminars on how to use computer software for glass working machines and apparatus; educational and instruction services, namely, arranging and conducting of seminars on how to use software for ceramics working machines and apparatus; educational and instruction services, namely, arranging and conducting of seminars on how to use software for resin working machines and apparatus; educational and instruction services, namely, arranging and conducting of seminars on how to use software for synthetic resin working machines and apparatus; educational and instruction services, namely, arranging and conducting of seminars on how to use software for leather working machines and apparatus; educational and instruction services, namely, arranging and conducting of seminars on how to use software for stone working machines and apparatus; educational and instruction services, namely, arranging and conducting of seminars on how to use software for wood working machines and apparatus; educational and instruction services, namely, arranging and conducting of seminars on how to use computer software; educational and instruction services, namely, arranging and conducting of seminars on how to use electronic machines, apparatus and their parts; educational and instruction services, namely, arranging and conducting of seminars on how to use telecommunication machines and apparatus; educational and instruction services, namely, arranging and conducting of seminars on how to use CAD/CAM machines for dental purposes, machines for dental technical purposes, and medical machines and apparatus; educational and instruction services, namely, arranging and conducting of seminars on how to use synthetic materials for dental use for fillings; educational and instruction services, namely, arranging and conducting of seminars on how to use cutting, polishing and sharpening machines for dental and dental technical purposes