Who builds GASGAS engines?

Could you please elaborate on the entity responsible for manufacturing the GASGAS engines? Are they a specialized company with a long history in the motorcycle engine industry, or are they a relatively new entrant with innovative technology? Are they known for their reliability, performance, or both? I'm curious about the background and capabilities of the organization that designs and produces these engines, as well as any specific advancements or patents they may hold in the field of motorcycle engines. Clarifying this information would greatly enhance my understanding of the GASGAS engines and their place in the market.