Abram Neiman built several three-wheeled cars:
- a 1929 streamlined prototype with cycle wings, license number IZ-0571
- a 1930 streamlined prototype with conventional fenders for NSU, license number IIIE-013
- a 1930 Cabrio-Limousine with conventional radiator was built on that chassis by NSU, license number IIIE-013
- a 1931 streamlined prototype with conventional fenders and Triumph engine, license number IZ-55466 ==> the puzzle car
- a 1932 conventional prototype with radiator mask and DKW engine, probably built on the same chassis as the puzzle car, because it carries the same license number.
The last car led to the 1933 Framo Stromer.