Claim: GG Duetto is a sidecar produced from 1994 to 1999 by Grüter + Gut Motorradtechnik GmbH (GG).
Evidence: The GG Duetto was sold as motorcycle-sidecar combination built by Swiss manufacturer Grüter + Gut Motorradtechnik GmbH (GG) between 1994 and 1999. Unlike a traditional sidecar added to a motorcycle, the GG Duetto is built to function only as a sidecar. 
Sidecar 1994-1999 Grüter + Gut Motorradtechnik GmbH (GG)