The chairs operated by Sonet are all protected by patents. The patent number is US 6,842,943b2. It was invented by the German inventor Michael Sonnet.
Sonnet chair can be said to be the first chair in the western world, and it was also put into mass production at that time. 1842, michael thonet invented the hot bending process. 1859, he used the technology at that time to design a chair with only six parts, which can be mass-produced and packaged in flat plates.