Treatment of materials; machining of parts for others; production or manufacture for third parties, at their request and according to their specifications, of products, namely, implants and surgical components, watch movement and casing components, parts for relay antennas, connectors [electricity], parts for the aeronautics and automotive industries, micromotors, sensors, writing instruments, parts for 2D and 3D printers, locksmithing items; cutting, shaping, polishing, sandblasting, shot pe...