An invalid carriage was a low cost, low maintenance vehicle, designed specifically for people with physical disabilities. The last ones were withdrawn from the road in 2003, 27 years after the end of production, though some are still in existence. One of those still existing is a 1976 example, one of the last made, which is on display at the National Motor Museum

National Motor Museum

The National Motor Museum is a museum in the village of Beaulieu, set in the heart of the New Forest, in the English county of Hampshire.- History :...

 in Hampshire

Hampshire

Hampshire is a county on the southern coast of England in the United Kingdom. The county town of Hampshire is Winchester, a historic cathedral city that was once the capital of England. Hampshire is notable for housing the original birthplaces of the Royal Navy, British Army, and Royal Air Force...

.http://www.nationalmotormuseum.org.uk/?location_id=335&item=17&offset=0

Makers of invalid carriages included AC Cars

AC Cars

AC Cars Group Ltd. formerly known as Auto Carriers Ltd. is a British specialist automobile manufacturer and one of the oldest independent car marques founded in Britain...

 in England, Fend

Fritz Fend

Fritz Fend : was an aeronautical engineer. He worked for Messerschmitt and designed the famous Kabinenroller KR175 / KR200.Fend was a technical officer with the Luftwaffe during World War II....

 in West Germany

West Germany

West Germany is the common English, but not official, name for the Federal Republic of Germany or FRG in the period between its creation in May 1949 to German reunification on 3 October 1990....

,, Simson DUO in East Germany, SMZ in the Soviet Union

Soviet Union

The Soviet Union , officially the Union of Soviet Socialist Republics , was a constitutionally socialist state that existed in Eurasia between 1922 and 1991....

 and Velorex

Velorex

Velorex was a manufacturing cooperative in Solnice, Czechoslovakia. Notable products included a small three wheeled car first named Oskar, later Velorex , and the Type 562 sidecar...

 in Czechoslovakia

Czechoslovakia

Czechoslovakia or Czecho-Slovakia was a sovereign state in Central Europe which existed from October 1918, when it declared its independence from the Austro-Hungarian Empire, until 1992...

.

The Duo was made initially by VEB Fahrzeugbau und Ausrüstungen Brandis (VEB FAB) from 1973 until 1978, whereupon manufacture was transferred to VEB Robur, more famous for making trucks in Zittau.