The core activity of the company 'lehmann machts gmbh' is the provision of services in the field of lighting and event technology, including lighting technology, special effects, pyrotechnics and fog technology, as well as the provision of technical personnel and equipment for events and events. The core activity of the company in example 2 is the offering of web hosting services, including domain management and webspace packages. The core activity of the company in example 3 cannot be clearly determined, as the information on the website is not specific enough. However, it appears that the company offers some kind of license or software, but the exact nature of the activity remains unclear.